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Thread: How much does your 7M breath under boost?

  1. #1
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    Exclamation How much does your 7M breath under boost?

    The following are calculations figured up using these links:
    http://www.mygen.com/users/dbruce/my...sor%20Maps.htm

    http://not2fast.com/turbo/glossary/turbo_calc.shtml

    These numbers are set in increments of 250 RPMs starting at 2500 RPMs and ending at 7500 (for those people who are running higher than the stock rev limit).

    The first column of course is the RPM's, the second column is flow (in CFMs) for a NON-TURBO supra, third is flow (again, in CFM's) for the TURBO supra, and the last is a translation of column 3 into lb/min.

    10 psi (1.68027210884)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- STOCK BORE ENGINE
    ---------- 180Cid -------- 1.680272109 ----- 14.472



    2500 ---- 104.1666667 ---- 175.0283447 ---- 12.09427478
    2750 ---- 114.5833333 ---- 192.5311791 ---- 13.30370226
    3000 ---- 125.0000000 ---- 210.0340136 ---- 14.51312974
    3250 ---- 135.4166667 ---- 227.5368481 ---- 15.72255722
    3500 ---- 145.8333333 ---- 245.0396825 ---- 16.9319847
    3750 ---- 156.2500000 ---- 262.5425170 ---- 18.14141218
    4000 ---- 166.6666667 ---- 280.0453515 ---- 19.35083965
    4250 ---- 177.0833333 ---- 297.5481859 ---- 20.56026713
    4500 ---- 187.5000000 ---- 315.0510204 ---- 21.76969461
    4750 ---- 197.9166667 ---- 332.5538549 ---- 22.97912209
    5000 ---- 208.3333333 ---- 350.0566893 ---- 24.18854957
    5250 ---- 218.7500000 ---- 367.5595238 ---- 25.39797705
    5500 ---- 229.1666667 ---- 385.0623583 ---- 26.60740452
    5750 ---- 239.5833333 ---- 402.5651927 ---- 27.816832
    6000 ---- 250.0000000 ---- 420.0680272 ---- 29.02625948
    6250 ---- 260.4166667 ---- 437.5708617 ---- 30.23568696
    6500 ---- 270.8333333 ---- 455.0736961 ---- 31.44511444
    6750 ---- 281.2500000 ---- 472.5765306 ---- 32.65454192
    7000 ---- 291.6666667 ---- 490.0793651 ---- 33.86396939
    7250 ---- 302.0833333 ---- 507.5821995 ---- 35.07339687
    7500 ---- 312.5000000 ---- 525.0850340 ---- 36.28282435



    13psi (1.88435374149)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- STOCK BORE ENGINE
    ---------- 180Cid -------- 1.884353741 ----- 14.472



    2500 ---- 104.1666667 ---- 196.2868481 ---- 13.56321504
    2750 ---- 114.5833333 ---- 215.9155329 ---- 14.91953654
    3000 ---- 125.0000000 ---- 235.5442177 ---- 16.27585805
    3250 ---- 135.4166667 ---- 255.1729025 ---- 17.63217955
    3500 ---- 145.8333333 ---- 274.8015873 ---- 18.98850106
    3750 ---- 156.2500000 ---- 294.4302721 ---- 20.34482256
    4000 ---- 166.6666667 ---- 314.0589569 ---- 21.70114407
    4250 ---- 177.0833333 ---- 333.6876417 ---- 23.05746557
    4500 ---- 187.5000000 ---- 353.3163265 ---- 24.41378707
    4750 ---- 197.9166667 ---- 372.9450113 ---- 25.77010858
    5000 ---- 208.3333333 ---- 392.5736961 ---- 27.12643008
    5250 ---- 218.7500000 ---- 412.2023810 ---- 28.48275159
    5500 ---- 229.1666667 ---- 431.8310658 ---- 29.83907309
    5750 ---- 239.5833333 ---- 451.4597506 ---- 31.19539459
    6000 ---- 250.0000000 ---- 471.0884354 ---- 32.5517161
    6250 ---- 260.4166667 ---- 490.7171202 ---- 33.9080376
    6500 ---- 270.8333333 ---- 510.3458050 ---- 35.26435911
    6750 ---- 281.2500000 ---- 529.9744898 ---- 36.62068061
    7000 ---- 291.6666667 ---- 549.6031746 ---- 37.97700211
    7250 ---- 302.0833333 ---- 569.2318594 ---- 39.33332362
    7500 ---- 312.5000000 ---- 588.8605442 ---- 40.68964512



    15psi (2.02040816326)



    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- STOCK BORE ENGINE
    ---------- 180Cid -------- 2.020408163 ----- 14.472



    2500 ---- 104.1666667 ---- 210.4591837 ---- 14.54250855
    2750 ---- 114.5833333 ---- 231.5051020 ---- 15.9967594
    3000 ---- 125.0000000 ---- 252.5510204 ---- 17.45101025
    3250 ---- 135.4166667 ---- 273.5969388 ---- 18.90526111
    3500 ---- 145.8333333 ---- 294.6428571 ---- 20.35951196
    3750 ---- 156.2500000 ---- 315.6887755 ---- 21.81376282
    4000 ---- 166.6666667 ---- 336.7346939 ---- 23.26801367
    4250 ---- 177.0833333 ---- 357.7806122 ---- 24.72226453
    4500 ---- 187.5000000 ---- 378.8265306 ---- 26.17651538
    4750 ---- 197.9166667 ---- 399.8724490 ---- 27.63076624
    5000 ---- 208.3333333 ---- 420.9183673 ---- 29.08501709
    5250 ---- 218.7500000 ---- 441.9642857 ---- 30.53926795
    5500 ---- 229.1666667 ---- 463.0102041 ---- 31.9935188
    5750 ---- 239.5833333 ---- 484.0561224 ---- 33.44776966
    6000 ---- 250.0000000 ---- 505.1020408 ---- 34.90202051
    6250 ---- 260.4166667 ---- 526.1479592 ---- 36.35627136
    6500 ---- 270.8333333 ---- 547.1938775 ---- 37.81052222
    6750 ---- 281.2500000 ---- 568.2397959 ---- 39.26477307
    7000 ---- 291.6666667 ---- 589.2857143 ---- 40.71902393
    7250 ---- 302.0833333 ---- 610.3316327 ---- 42.17327478
    7500 ---- 312.5000000 ---- 631.3775510 ---- 43.62752564


    18psi (2.22448979591)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- STOCK BORE ENGINE
    ---------- 180Cid -------- 2.224489796 ----- 14.472



    2500 ---- 104.1666667 ---- 231.7176871 ---- 16.0114488
    2750 ---- 114.5833333 ---- 254.8894558 ---- 17.61259368
    3000 ---- 125.0000000 ---- 278.0612245 ---- 19.21373856
    3250 ---- 135.4166667 ---- 301.2329932 ---- 20.81488344
    3500 ---- 145.8333333 ---- 324.4047619 ---- 22.41602832
    3750 ---- 156.2500000 ---- 347.5765306 ---- 24.0171732
    4000 ---- 166.6666667 ---- 370.7482993 ---- 25.61831808
    4250 ---- 177.0833333 ---- 393.9200680 ---- 27.21946296
    4500 ---- 187.5000000 ---- 417.0918367 ---- 28.82060785
    4750 ---- 197.9166667 ---- 440.2636054 ---- 30.42175273
    5000 ---- 208.3333333 ---- 463.4353741 ---- 32.02289761
    5250 ---- 218.7500000 ---- 486.6071429 ---- 33.62404249
    5500 ---- 229.1666667 ---- 509.7789116 ---- 35.22518737
    5750 ---- 239.5833333 ---- 532.9506803 ---- 36.82633225
    6000 ---- 250.0000000 ---- 556.1224490 ---- 38.42747713
    6250 ---- 260.4166667 ---- 579.2942177 ---- 40.02862201
    6500 ---- 270.8333333 ---- 602.4659864 ---- 41.62976689
    6750 ---- 281.2500000 ---- 625.6377551 ---- 43.23091177
    7000 ---- 291.6666667 ---- 648.8095238 ---- 44.83205665
    7250 ---- 302.0833333 ---- 671.9812925 ---- 46.43320153
    7500 ---- 312.5000000 ---- 695.1530612 ---- 48.03434641


    20psi (2.36054421768)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- STOCK BORE ENGINE
    ---------- 180Cid -------- 2.360544218 ----- 14.472



    2500 ---- 104.1666667 ---- 245.8900227 ---- 16.99074231
    2750 ---- 114.5833333 ---- 270.4790249 ---- 18.68981654
    3000 ---- 125.0000000 ---- 295.0680272 ---- 20.38889077
    3250 ---- 135.4166667 ---- 319.6570295 ---- 22.087965
    3500 ---- 145.8333333 ---- 344.2460317 ---- 23.78703923
    3750 ---- 156.2500000 ---- 368.8350340 ---- 25.48611346
    4000 ---- 166.6666667 ---- 393.4240363 ---- 27.18518769
    4250 ---- 177.0833333 ---- 418.0130385 ---- 28.88426192
    4500 ---- 187.5000000 ---- 442.6020408 ---- 30.58333615
    4750 ---- 197.9166667 ---- 467.1910431 ---- 32.28241038
    5000 ---- 208.3333333 ---- 491.7800454 ---- 33.98148462
    5250 ---- 218.7500000 ---- 516.3690476 ---- 35.68055885
    5500 ---- 229.1666667 ---- 540.9580499 ---- 37.37963308
    5750 ---- 239.5833333 ---- 565.5470522 ---- 39.07870731
    6000 ---- 250.0000000 ---- 590.1360544 ---- 40.77778154
    6250 ---- 260.4166667 ---- 614.7250567 ---- 42.47685577
    6500 ---- 270.8333333 ---- 639.3140590 ---- 44.17593
    6750 ---- 281.2500000 ---- 663.9030612 ---- 45.87500423
    7000 ---- 291.6666667 ---- 688.4920635 ---- 47.57407846
    7250 ---- 302.0833333 ---- 713.0810658 ---- 49.27315269
    7500 ---- 312.5000000 ---- 737.6700680 ---- 50.97222692


    23psi (2.56462585034)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- STOCK BORE ENGINE
    ---------- 180Cid -------- 2.56462585 ----- 14.472



    2500 ---- 104.1666667 ---- 267.1485261 ---- 18.45968256
    2750 ---- 114.5833333 ---- 293.8633787 ---- 20.30565082
    3000 ---- 125.0000000 ---- 320.5782313 ---- 22.15161908
    3250 ---- 135.4166667 ---- 347.2930839 ---- 23.99758733
    3500 ---- 145.8333333 ---- 374.0079365 ---- 25.84355559
    3750 ---- 156.2500000 ---- 400.7227891 ---- 27.68952385
    4000 ---- 166.6666667 ---- 427.4376417 ---- 29.5354921
    4250 ---- 177.0833333 ---- 454.1524943 ---- 31.38146036
    4500 ---- 187.5000000 ---- 480.8673469 ---- 33.22742862
    4750 ---- 197.9166667 ---- 507.5821995 ---- 35.07339687
    5000 ---- 208.3333333 ---- 534.2970522 ---- 36.91936513
    5250 ---- 218.7500000 ---- 561.0119048 ---- 38.76533339
    5500 ---- 229.1666667 ---- 587.7267574 ---- 40.61130164
    5750 ---- 239.5833333 ---- 614.4416100 ---- 42.4572699
    6000 ---- 250.0000000 ---- 641.1564626 ---- 44.30323816
    6250 ---- 260.4166667 ---- 667.8713152 ---- 46.14920641
    6500 ---- 270.8333333 ---- 694.5861678 ---- 47.99517467
    6750 ---- 281.2500000 ---- 721.3010204 ---- 49.84114292
    7000 ---- 291.6666667 ---- 748.0158730 ---- 51.68711118
    7250 ---- 302.0833333 ---- 774.7307256 ---- 53.53307944
    7500 ---- 312.5000000 ---- 801.4455782 ---- 55.37904769


    25psi (2.7006802721)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- STOCK BORE ENGINE
    ---------- 180Cid -------- 2.700680272 ----- 14.472



    2500 ---- 104.1666667 ---- 281.3208617 ---- 19.43897607
    2750 ---- 114.5833333 ---- 309.4529478 ---- 21.38287368
    3000 ---- 125.0000000 ---- 337.5850340 ---- 23.32677128
    3250 ---- 135.4166667 ---- 365.7171202 ---- 25.27066889
    3500 ---- 145.8333333 ---- 393.8492063 ---- 27.2145665
    3750 ---- 156.2500000 ---- 421.9812925 ---- 29.1584641
    4000 ---- 166.6666667 ---- 450.1133787 ---- 31.10236171
    4250 ---- 177.0833333 ---- 478.2454649 ---- 33.04625932
    4500 ---- 187.5000000 ---- 506.3775510 ---- 34.99015693
    4750 ---- 197.9166667 ---- 534.5096372 ---- 36.93405453
    5000 ---- 208.3333333 ---- 562.6417234 ---- 38.87795214
    5250 ---- 218.7500000 ---- 590.7738095 ---- 40.82184975
    5500 ---- 229.1666667 ---- 618.9058957 ---- 42.76574735
    5750 ---- 239.5833333 ---- 647.0379819 ---- 44.70964496
    6000 ---- 250.0000000 ---- 675.1700680 ---- 46.65354257
    6250 ---- 260.4166667 ---- 703.3021542 ---- 48.59744017
    6500 ---- 270.8333333 ---- 731.4342404 ---- 50.54133778
    6750 ---- 281.2500000 ---- 759.5663265 ---- 52.48523539
    7000 ---- 291.6666667 ---- 787.6984127 ---- 54.42913299
    7250 ---- 302.0833333 ---- 815.8304989 ---- 56.3730306
    7500 ---- 312.5000000 ---- 843.9625850 ---- 58.31692821



    NOW, using this link: http://not2fast.com/gasflow/velocity.shtml you will be able to figure up what size piping you will need for you power needs. Using an air tempurature of 75 degrees and a piping diameter of 2.5" and running 20 psi at 5000 RPM's, you will see a velocity of 240.4 ft/sec and a psig of 0.48. You typically want right at 300 ft/sec velocity in the main portion of your car's specific powerband. Anything over and psig begins increasing dramastically. Now, same psi at 6500 RPM's with the 2.5" piping, you will see a velocity of 312.5 ft/sec and a psig of 0.81. Let's bump it up to 7000 RPM's, same piping, velocity is 336.5 ft/sec and psig is 0.94. Notice how much your psig has risen with only being 36.5 ft/sec over critical velocity?

    To plug in this info on a compressor map for a turbo use the boost
    (20psiX14.7) ------or 2.3605 on the Y axis and your CFMs on the X axis.
    ------------
    14.7




    Next up is the .020" overbore 7M, you will notice a slight increase in CFM's over the stock bore. This is why some people think, "bigger is better".


    10psi (1.68027210884)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- .020" OVERBORE ENGINE
    ---------- 180Cid -------- 1.680272109 ----- 14.472



    2500 ---- 105.9027778 ---- 177.9454837 ---- 12.29584603
    2750 ---- 116.4930556 ---- 195.7400321 ---- 13.52543063
    3000 ---- 127.0833333 ---- 213.5345805 ---- 14.75501524
    3250 ---- 137.6736111 ---- 231.3291289 ---- 15.98459984
    3500 ---- 148.2638889 ---- 249.1236772 ---- 17.21418444
    3750 ---- 158.8541667 ---- 266.9182256 ---- 18.44376905
    4000 ---- 169.4444444 ---- 284.7127740 ---- 19.67335365
    4250 ---- 180.0347222 ---- 302.5073224 ---- 20.90293825
    4500 ---- 190.6250000 ---- 320.3018707 ---- 22.13252285
    4750 ---- 201.2152778 ---- 338.0964191 ---- 23.36210746
    5000 ---- 211.8055556 ---- 355.8909675 ---- 24.59169206
    5250 ---- 222.3958333 ---- 373.6855159 ---- 25.82127666
    5500 ---- 232.9861111 ---- 391.4800642 ---- 27.05086127
    5750 ---- 243.5763889 ---- 409.2746126 ---- 28.28044587
    6000 ---- 254.1666667 ---- 427.0691610 ---- 29.51003047
    6250 ---- 264.7569444 ---- 444.8637094 ---- 30.73961508
    6500 ---- 275.3472222 ---- 462.6582577 ---- 31.96919968
    6750 ---- 285.9375000 ---- 480.4528061 ---- 33.19878428
    7000 ---- 296.5277778 ---- 498.2473545 ---- 34.42836888
    7250 ---- 307.1180556 ---- 516.0419029 ---- 35.65795349
    7500 ---- 317.7083333 ---- 533.8364512 ---- 36.88753809


    13psi (1.88435374149)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- .020" OVERBORE ENGINE
    ---------- 180Cid -------- 1.884353741 ----- 14.472



    2500 ---- 105.9027778 ---- 199.5582955 ---- 13.78926862
    2750 ---- 116.4930556 ---- 219.5141251 ---- 15.16819549
    3000 ---- 127.0833333 ---- 239.4699546 ---- 16.54712235
    3250 ---- 137.6736111 ---- 259.4257842 ---- 17.92604921
    3500 ---- 148.2638889 ---- 279.3816138 ---- 19.30497607
    3750 ---- 158.8541667 ---- 299.3374433 ---- 20.68390294
    4000 ---- 169.4444444 ---- 319.2932729 ---- 22.0628298
    4250 ---- 180.0347222 ---- 339.2491024 ---- 23.44175666
    4500 ---- 190.6250000 ---- 359.2049320 ---- 24.82068352
    4750 ---- 201.2152778 ---- 379.1607615 ---- 26.19961039
    5000 ---- 211.8055556 ---- 399.1165911 ---- 27.57853725
    5250 ---- 222.3958333 ---- 419.0724206 ---- 28.95746411
    5500 ---- 232.9861111 ---- 439.0282502 ---- 30.33639097
    5750 ---- 243.5763889 ---- 458.9840797 ---- 31.71531784
    6000 ---- 254.1666667 ---- 478.9399093 ---- 33.0942447
    6250 ---- 264.7569444 ---- 498.8957388 ---- 34.47317156
    6500 ---- 275.3472222 ---- 518.8515684 ---- 35.85209842
    6750 ---- 285.9375000 ---- 538.8073980 ---- 37.23102529
    7000 ---- 296.5277778 ---- 558.7632275 ---- 38.60995215
    7250 ---- 307.1180556 ---- 578.7190571 ---- 39.98887901
    7500 ---- 317.7083333 ---- 598.6748866 ---- 41.36780587


    15psi (2.02040816326)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- .020" OVERBORE ENGINE
    ---------- 180Cid -------- 2.020408163 ----- 14.472



    2500 ---- 105.9027778 ---- 213.9668367 ---- 14.78488369
    2750 ---- 116.4930556 ---- 235.3635204 ---- 16.26337206
    3000 ---- 127.0833333 ---- 256.7602041 ---- 17.74186043
    3250 ---- 137.6736111 ---- 278.1568878 ---- 19.22034879
    3500 ---- 148.2638889 ---- 299.5535714 ---- 20.69883716
    3750 ---- 158.8541667 ---- 320.9502551 ---- 22.17732553
    4000 ---- 169.4444444 ---- 342.3469388 ---- 23.6558139
    4250 ---- 180.0347222 ---- 363.7436224 ---- 25.13430227
    4500 ---- 190.6250000 ---- 385.1403061 ---- 26.61279064
    4750 ---- 201.2152778 ---- 406.5369898 ---- 28.09127901
    5000 ---- 211.8055556 ---- 427.9336735 ---- 29.56976738
    5250 ---- 222.3958333 ---- 449.3303571 ---- 31.04825575
    5500 ---- 232.9861111 ---- 470.7270408 ---- 32.52674411
    5750 ---- 243.5763889 ---- 492.1237245 ---- 34.00523248
    6000 ---- 254.1666667 ---- 513.5204082 ---- 35.48372085
    6250 ---- 264.7569444 ---- 534.9170918 ---- 36.96220922
    6500 ---- 275.3472222 ---- 556.3137755 ---- 38.44069759
    6750 ---- 285.9375000 ---- 577.7104592 ---- 39.91918596
    7000 ---- 296.5277778 ---- 599.1071429 ---- 41.39767433
    7250 ---- 307.1180556 ---- 620.5038265 ---- 42.8761627
    7500 ---- 317.7083333 ---- 641.9005102 ---- 44.35465106


    18psi (2.22448979591)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- .020" OVERBORE ENGINE
    ---------- 180Cid -------- 2.224489796 ----- 14.472



    2500 ---- 105.9027778 ---- 235.5796485 ---- 16.27830628
    2750 ---- 116.4930556 ---- 259.1376134 ---- 17.90613691
    3000 ---- 127.0833333 ---- 282.6955782 ---- 19.53396754
    3250 ---- 137.6736111 ---- 306.2535431 ---- 21.16179817
    3500 ---- 148.2638889 ---- 329.8115079 ---- 22.7896288
    3750 ---- 158.8541667 ---- 353.3694728 ---- 24.41745942
    4000 ---- 169.4444444 ---- 376.9274376 ---- 26.04529005
    4250 ---- 180.0347222 ---- 400.4854025 ---- 27.67312068
    4500 ---- 190.6250000 ---- 424.0433673 ---- 29.30095131
    4750 ---- 201.2152778 ---- 447.6013322 ---- 30.92878194
    5000 ---- 211.8055556 ---- 471.1592971 ---- 32.55661257
    5250 ---- 222.3958333 ---- 494.7172619 ---- 34.18444319
    5500 ---- 232.9861111 ---- 518.2752268 ---- 35.81227382
    5750 ---- 243.5763889 ---- 541.8331916 ---- 37.44010445
    6000 ---- 254.1666667 ---- 565.3911565 ---- 39.06793508
    6250 ---- 264.7569444 ---- 588.9491213 ---- 40.69576571
    6500 ---- 275.3472222 ---- 612.5070862 ---- 42.32359634
    6750 ---- 285.9375000 ---- 636.0650510 ---- 43.95142696
    7000 ---- 296.5277778 ---- 659.6230159 ---- 45.57925759
    7250 ---- 307.1180556 ---- 683.1809807 ---- 47.20708822
    7500 ---- 317.7083333 ---- 706.7389456 ---- 48.83491885


    20psi (2.36054421768)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- .020" OVERBORE ENGINE
    ---------- 180Cid -------- 2.360544218 ----- 14.472



    2500 ---- 105.9027778 ---- 249.9881897 ---- 17.27392135
    2750 ---- 116.4930556 ---- 274.9870087 ---- 19.00131348
    3000 ---- 127.0833333 ---- 299.9858277 ---- 20.72870562
    3250 ---- 137.6736111 ---- 324.9846466 ---- 22.45609775
    3500 ---- 148.2638889 ---- 349.9834656 ---- 24.18348988
    3750 ---- 158.8541667 ---- 374.9822846 ---- 25.91088202
    4000 ---- 169.4444444 ---- 399.9811036 ---- 27.63827415
    4250 ---- 180.0347222 ---- 424.9799225 ---- 29.36566629
    4500 ---- 190.6250000 ---- 449.9787415 ---- 31.09305842
    4750 ---- 201.2152778 ---- 474.9775605 ---- 32.82045056
    5000 ---- 211.8055556 ---- 499.9763794 ---- 34.54784269
    5250 ---- 222.3958333 ---- 524.9751984 ---- 36.27523483
    5500 ---- 232.9861111 ---- 549.9740174 ---- 38.00262696
    5750 ---- 243.5763889 ---- 574.9728364 ---- 39.7300191
    6000 ---- 254.1666667 ---- 599.9716553 ---- 41.45741123
    6250 ---- 264.7569444 ---- 624.9704743 ---- 43.18480337
    6500 ---- 275.3472222 ---- 649.9692933 ---- 44.9121955
    6750 ---- 285.9375000 ---- 674.9681122 ---- 46.63958763
    7000 ---- 296.5277778 ---- 699.9669312 ---- 48.36697977
    7250 ---- 307.1180556 ---- 724.9657502 ---- 50.0943719
    7500 ---- 317.7083333 ---- 749.9645692 ---- 51.82176404


    23psi (2.5646585034)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- .020" OVERBORE ENGINE
    ---------- 180Cid -------- 2.56462585 ----- 14.472



    2500 ---- 105.9027778 ---- 271.6010015 ---- 18.76734394
    2750 ---- 116.4930556 ---- 298.7611017 ---- 20.64407833
    3000 ---- 127.0833333 ---- 325.9212018 ---- 22.52081273
    3250 ---- 137.6736111 ---- 353.0813020 ---- 24.39754712
    3500 ---- 148.2638889 ---- 380.2414021 ---- 26.27428152
    3750 ---- 158.8541667 ---- 407.4015023 ---- 28.15101591
    4000 ---- 169.4444444 ---- 434.5616024 ---- 30.02775031
    4250 ---- 180.0347222 ---- 461.7217026 ---- 31.9044847
    4500 ---- 190.6250000 ---- 488.8818027 ---- 33.78121909
    4750 ---- 201.2152778 ---- 516.0419029 ---- 35.65795349
    5000 ---- 211.8055556 ---- 543.2020030 ---- 37.53468788
    5250 ---- 222.3958333 ---- 570.3621032 ---- 39.41142228
    5500 ---- 232.9861111 ---- 597.5222033 ---- 41.28815667
    5750 ---- 243.5763889 ---- 624.6823035 ---- 43.16489106
    6000 ---- 254.1666667 ---- 651.8424036 ---- 45.04162546
    6250 ---- 264.7569444 ---- 679.0025038 ---- 46.91835985
    6500 ---- 275.3472222 ---- 706.1626039 ---- 48.79509425
    6750 ---- 285.9370000 ---- 733.3227041 ---- 50.67182864
    7000 ---- 296.5277778 ---- 760.4828042 ---- 52.54856303
    7250 ---- 307.1180556 ---- 787.6429044 ---- 54.42529743
    7500 ---- 317.7083333 ---- 814.8030045 ---- 56.30203182


    25psi (2.7006802721)


    RPM ------ NA ------------ TURBO CFM ----- lb/min
    ---------------- .020" OVERBORE ENGINE
    ---------- 180Cid -------- 2.700680272 ----- 14.472



    2500 ---- 105.9027778 ---- 286.0095427 ---- 19.762959
    2750 ---- 116.4930556 ---- 314.6104970 ---- 21.7392549
    3000 ---- 127.0833333 ---- 343.2114512 ---- 23.7155508
    3250 ---- 137.6736111 ---- 371.8124055 ---- 25.69184671
    3500 ---- 148.2638889 ---- 400.4133598 ---- 27.66814261
    3750 ---- 158.8541667 ---- 429.0143141 ---- 29.64443851
    4000 ---- 169.4444444 ---- 457.6152683 ---- 31.62073441
    4250 ---- 180.0347222 ---- 486.2162226 ---- 33.59703031
    4500 ---- 190.6250000 ---- 514.8171769 ---- 35.57332621
    4750 ---- 201.2152778 ---- 543.4181311 ---- 37.54962211
    5000 ---- 211.8055556 ---- 572.0190854 ---- 39.52591801
    5250 ---- 222.3958333 ---- 600.6200397 ---- 41.50221391
    5500 ---- 232.9861111 ---- 629.2209940 ---- 43.47850981
    5750 ---- 243.5763889 ---- 657.8219482 ---- 45.45480571
    6000 ---- 254.1666667 ---- 686.4229025 ---- 47.43110161
    6250 ---- 264.7569444 ---- 715.0238568 ---- 49.40739751
    6500 ---- 275.3472222 ---- 743.6248110 ---- 51.38369341
    6750 ---- 285.9375000 ---- 772.2257653 ---- 53.35998931
    7000 ---- 296.5277778 ---- 800.8267196 ---- 55.33628521
    7250 ---- 307.1180556 ---- 829.4276738 ---- 57.31258111
    7500 ---- 317.7083333 ---- 858.0286281 ---- 59.28887701


    Ok, lets use 5000 RPM's again with 2.5" and see what we get as a comparison, 244.4 ft/sec with a psig of 0.49. At 6000 RPM's you get 317.7 ft/sec and a pressure drop of 0.83 psig. At 7000 RPM's you get 342.1 ft/sec and a pressure drop of 0.97 psig, again, a drastic increase once critical velocity has been breached. Not a larg gain over a stock bore eh?




    And finally, the .040" overbore 7M. You will notice that performance gains are not significant by increasing the size of the engine through an overbore, these numbers prove that . An overbore is typically used ONLY when there is not enough material on the piston walls to do a re-ring job of the original bore or due to damage of the cylinder bore through detonation or other means such as a foreign object entering the combustion chamber.


    10psi (1.68027210884)


    RPM -------- NA ------ TURBO CFM ---- lb/min
    ---------------- OVERBORED ENGINE (0.040")
    ---------- 185 Cid ----- 1.680272109 ---- 14.472

    2500 ---- 107.0602 ---- 179.8902680 ---- 12.43022858
    2750 ---- 117.7662 ---- 197.8792612 ---- 13.67324912
    3000 ---- 128.4722 ---- 215.8682544 ---- 14.91626965
    3250 ---- 139.1782 ---- 233.8572476 ---- 16.15929019
    3500 ---- 149.8843 ---- 251.8464088 ---- 17.40232234
    3750 ---- 160.5903 ---- 269.8354020 ---- 18.64534287
    4000 ---- 171.2963 ---- 287.8243952 ---- 19.88836341
    4250 ---- 182.0023 ---- 305.8133884 ---- 21.13138394
    4500 ---- 192.7083 ---- 323.8023816 ---- 22.37440448
    4750 ---- 203.4144 ---- 341.7915429 ---- 23.61743663
    5000 ---- 214.1204 ---- 359.7805361 ---- 24.86045716
    5250 ---- 224.8264 ---- 377.7695293 ---- 26.1034777
    5500 ---- 235.5324 ---- 395.7585224 ---- 27.34649823
    5750 ---- 246.2384 ---- 413.7475156 ---- 28.58951877
    6000 ---- 256.9444 ---- 431.7365088 ---- 29.83253931
    6250 ---- 267.6505 ---- 449.7256701 ---- 31.07557145
    6500 ---- 278.3565 ---- 467.7146633 ---- 32.31859199
    6750 ---- 289.0625 ---- 485.7036565 ---- 33.56161252
    7000 ---- 299.7685 ---- 503.6926497 ---- 34.80463306
    7250 ---- 310.4745 ---- 521.6816429 ---- 36.0476536
    7500 ---- 321.1806 ---- 539.6708041 ---- 37.29068574


    13psi (1.88435374149)

    RPM -------- NA ------ TURBO CFM ---- lb/min
    ---------------- OVERBORED ENGINE (0.040")
    ---------- 185 Cid ----- 1.884353741 ---- 14.472

    2500 ---- 107.0602 ---- 201.7392884 ---- 13.93997294
    2750 ---- 117.7662 ---- 221.9131796 ---- 15.33396763
    3000 ---- 128.4722 ---- 242.0870707 ---- 16.72796232
    3250 ---- 139.1782 ---- 262.2609619 ---- 18.12195701
    3500 ---- 149.8843 ---- 282.4350415 ---- 19.51596472
    3750 ---- 160.5903 ---- 302.6089327 ---- 20.90995941
    4000 ---- 171.2963 ---- 322.7828238 ---- 22.30395411
    4250 ---- 182.0023 ---- 342.9567150 ---- 23.6979488
    4500 ---- 192.7083 ---- 363.1306061 ---- 25.09194349
    4750 ---- 203.4144 ---- 383.3046857 ---- 26.4859512
    5000 ---- 214.1204 ---- 403.4785769 ---- 27.87994589
    5250 ---- 224.8264 ---- 423.6524680 ---- 29.27394058
    5500 ---- 235.5324 ---- 443.8263592 ---- 30.66793527
    5750 ---- 246.2384 ---- 464.0002503 ---- 32.06192996
    6000 ---- 256.9444 ---- 484.1741415 ---- 33.45592465
    6250 ---- 267.6505 ---- 504.3482211 ---- 34.84993236
    6500 ---- 278.3565 ---- 524.5221122 ---- 36.24392705
    6750 ---- 289.0625 ---- 544.6960034 ---- 37.63792174
    7000 ---- 299.7685 ---- 564.8698946 ---- 39.03191643
    7250 ---- 310.4745 ---- 585.0437857 ---- 40.42591112
    7500 ---- 321.1806 ---- 605.2178653 ---- 41.81991883


    15psi (2.02040816326)

    RPM -------- NA ------ TURBO CFM ---- lb/min
    ---------------- OVERBORED ENGINE (0.040")
    ---------- 185 Cid ----- 2.020408163 ---- 14.472

    2500 ---- 107.0602 ---- 216.3053020 ---- 14.94646918
    2750 ---- 117.7662 ---- 237.9357918 ---- 16.44111331
    3000 ---- 128.4722 ---- 259.5662816 ---- 17.93575744
    3250 ---- 139.1782 ---- 281.1967714 ---- 19.43040156
    3500 ---- 149.8843 ---- 302.8274633 ---- 20.92505965
    3750 ---- 160.5903 ---- 324.4579531 ---- 22.41970378
    4000 ---- 171.2963 ---- 346.0884429 ---- 23.9143479
    4250 ---- 182.0023 ---- 367.7189327 ---- 25.40899203
    4500 ---- 192.7083 ---- 389.3494224 ---- 26.90363616
    4750 ---- 203.4144 ---- 410.9801143 ---- 28.39829424
    5000 ---- 214.1204 ---- 432.6106041 ---- 29.89293837
    5250 ---- 224.8264 ---- 454.2410939 ---- 31.3875825
    5500 ---- 235.5324 ---- 475.8715837 ---- 32.88222662
    5750 ---- 246.2384 ---- 497.5020735 ---- 34.37687075
    6000 ---- 256.9444 ---- 519.1325633 ---- 35.87151487
    6250 ---- 267.6505 ---- 540.7632551 ---- 37.36617296
    6500 ---- 278.3565 ---- 562.3937449 ---- 38.86081709
    6750 ---- 289.0625 ---- 584.0242347 ---- 40.35546121
    7000 ---- 299.7685 ---- 605.6547245 ---- 41.85010534
    7250 ---- 310.4745 ---- 627.2852143 ---- 43.34474947
    7500 ---- 321.1806 ---- 648.9159061 ---- 44.83940755


    18psi (2.22448979591)

    RPM -------- NA ------ TURBO CFM ---- lb/min
    ---------------- OVERBORED ENGINE (0.040")
    ---------- 185 Cid ----- 2.224489796 ---- 14.472

    2500 ---- 107.0602 ---- 238.1543224 ---- 16.45621355
    2750 ---- 117.7662 ---- 261.9697102 ---- 18.10183183
    3000 ---- 128.4722 ---- 285.7850980 ---- 19.74745011
    3250 ---- 139.1782 ---- 309.6004857 ---- 21.39306839
    3500 ---- 149.8843 ---- 333.4160959 ---- 23.03870204
    3750 ---- 160.5903 ---- 357.2314837 ---- 24.68432032
    4000 ---- 171.2963 ---- 381.0468714 ---- 26.3299386
    4250 ---- 182.0023 ---- 404.8622592 ---- 27.97555688
    4500 ---- 192.7083 ---- 428.6776469 ---- 29.62117516
    4750 ---- 203.4144 ---- 452.4932571 ---- 31.26680881
    5000 ---- 214.1204 ---- 476.3086449 ---- 32.91242709
    5250 ---- 224.8264 ---- 500.1240327 ---- 34.55804537
    5500 ---- 235.5324 ---- 523.9394204 ---- 36.20366365
    5750 ---- 246.2384 ---- 547.7548082 ---- 37.84928193
    6000 ---- 256.9444 ---- 571.5701959 ---- 39.49490022
    6250 ---- 267.6505 ---- 595.3858061 ---- 41.14053387
    6500 ---- 278.3565 ---- 619.2011939 ---- 42.78615215
    6750 ---- 289.0625 ---- 643.0165816 ---- 44.43177043
    7000 ---- 299.7685 ---- 666.8319694 ---- 46.07738871
    7250 ---- 310.4745 ---- 690.6473571 ---- 47.72300699
    7500 ---- 321.1806 ---- 714.4629673 ---- 49.36864064


    20psi (2.36054421768)

    RPM -------- NA ------ TURBO CFM ---- lb/min
    ---------------- OVERBORED ENGINE (0.040")
    ---------- 185 Cid ----- 2.360544218 ---- 14.472

    2500 ---- 107.0602 ---- 252.7203361 ---- 17.46270979
    2750 ---- 117.7662 ---- 277.9923224 ---- 19.2089775
    3000 ---- 128.4722 ---- 303.2643088 ---- 20.95524522
    3250 ---- 139.1782 ---- 328.5362952 ---- 22.70151294
    3500 ---- 149.8843 ---- 353.8085177 ---- 24.44779697
    3750 ---- 160.5903 ---- 379.0805041 ---- 26.19406468
    4000 ---- 171.2963 ---- 404.3524905 ---- 27.9403324
    4250 ---- 182.0023 ---- 429.6244769 ---- 29.68660012
    4500 ---- 192.7083 ---- 454.8964633 ---- 31.43286783
    4750 ---- 203.4144 ---- 480.1686857 ---- 33.17915186
    5000 ---- 214.1204 ---- 505.4406721 ---- 34.92541958
    5250 ---- 224.8264 ---- 530.7126585 ---- 36.67168729
    5500 ---- 235.5324 ---- 555.9846449 ---- 38.41795501
    5750 ---- 246.2384 ---- 581.2566313 ---- 40.16422273
    6000 ---- 256.9444 ---- 606.5286177 ---- 41.91049044
    6250 ---- 267.6505 ---- 631.8008401 ---- 43.65677447
    6500 ---- 278.3565 ---- 657.0728265 ---- 45.40304219
    6750 ---- 289.0625 ---- 682.3448129 ---- 47.1493099
    7000 ---- 299.7685 ---- 707.6167993 ---- 48.89557762
    7250 ---- 310.4745 ---- 732.8887857 ---- 50.64184534
    7500 ---- 321.1806 ---- 758.1610082 ---- 52.38812936


    23psi (2.56462585034)

    RPM -------- NA ------ TURBO CFM ---- lb/min
    ---------------- OVERBORED ENGINE (0.040")
    ---------- 185 Cid ----- 2.56462585 ---- 14.472

    2500 ---- 107.0602 ---- 274.5693565 ---- 18.97245415
    2750 ---- 117.7662 ---- 302.0262408 ---- 20.86969602
    3000 ---- 128.4722 ---- 329.4831252 ---- 22.76693789
    3250 ---- 139.1782 ---- 356.9400095 ---- 24.66417976
    3500 ---- 149.8843 ---- 384.3971503 ---- 26.56143935
    3750 ---- 160.5903 ---- 411.8540347 ---- 28.45868123
    4000 ---- 171.2963 ---- 439.3109190 ---- 30.3559231
    4250 ---- 182.0023 ---- 466.7678034 ---- 32.25316497
    4500 ---- 192.7083 ---- 494.2246878 ---- 34.15040684
    4750 ---- 203.4144 ---- 521.6818286 ---- 36.04766643
    5000 ---- 214.1204 ---- 549.1387129 ---- 37.9449083
    5250 ---- 224.8264 ---- 576.5955973 ---- 39.84215017
    5500 ---- 235.5324 ---- 604.0524816 ---- 41.73939204
    5750 ---- 246.2384 ---- 631.5093660 ---- 43.63663391
    6000 ---- 256.9444 ---- 658.9662503 ---- 45.53387578
    6250 ---- 267.6505 ---- 686.4233912 ---- 47.43113538
    6500 ---- 278.3565 ---- 713.8802755 ---- 49.32837725
    6750 ---- 289.0625 ---- 741.3371599 ---- 51.22561912
    7000 ---- 299.7685 ---- 768.7940442 ---- 53.12286099
    7250 ---- 310.4745 ---- 796.2509286 ---- 55.02010286
    7500 ---- 321.1806 ---- 823.7080694 ---- 56.91736245


    25psi (2.7006802721)

    RPM -------- NA ------ TURBO CFM ---- lb/min
    ---------------- OVERBORED ENGINE (0.040")
    ---------- 185 Cid ----- 2.700680272 ---- 14.472

    2500 ---- 107.0602 ---- 289.1353701 ---- 19.97895039
    2750 ---- 117.7662 ---- 318.0488531 ---- 21.9768417
    3000 ---- 128.4722 ---- 346.9623361 ---- 23.97473301
    3250 ---- 139.1782 ---- 375.8758190 ---- 25.97262431
    3500 ---- 149.8843 ---- 404.7895721 ---- 27.97053428
    3750 ---- 160.5903 ---- 433.7030551 ---- 29.96842559
    4000 ---- 171.2963 ---- 462.6165381 ---- 31.96631689
    4250 ---- 182.0023 ---- 491.5300211 ---- 33.9642082
    4500 ---- 192.7083 ---- 520.4435041 ---- 35.96209951
    4750 ---- 203.4144 ---- 549.3572571 ---- 37.96000948
    5000 ---- 214.1204 ---- 578.2707401 ---- 39.95790078
    5250 ---- 224.8264 ---- 607.1842231 ---- 41.95579209
    5500 ---- 235.5324 ---- 636.0977061 ---- 43.9536834
    5750 ---- 246.2384 ---- 665.0111891 ---- 45.9515747
    6000 ---- 256.9444 ---- 693.9246721 ---- 47.94946601
    6250 ---- 267.6505 ---- 722.8384252 ---- 49.94737598
    6500 ---- 278.3565 ---- 751.7519082 ---- 51.94526729
    6750 ---- 289.0625 ---- 780.6653912 ---- 53.94315859
    7000 ---- 299.7685 ---- 809.5788741 ---- 55.9410499
    7250 ---- 310.4745 ---- 838.4923571 ---- 57.93894121
    7500 ---- 321.1806 ---- 867.4061102 ---- 59.93685117


    It's your turn to plug in those numbers that I've done in the above post to see what kind of flow you will get .
    Last edited by starscream5000; May 11th, 2007 at 08:55 AM.
    Quote Originally Posted by Reign_Maker
    I can count on one hand the members of this site that I dont like... You're the middle finger...
    Quote Originally Posted by mibrum View Post
    I shift the gears at 9450rpm
    Buy my stuff **Click here**

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