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Thread: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

  1. #11
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    stuck.

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  2. #12
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    Quote Originally Posted by ma71supraturbo View Post
    As I posted -- the only data I've found is from Erin Carpenter. Here is his post on SF:



    http://www.supraforums.com/forum/sho...d.php?t=339560

    the flow of 2jz stock head that Erin Carpenter flowed is not same as my friend 2jz stock head?

    for intake port ,at .400, my friend had 215cfm and after port&polish he had 234cfm???

    bizarre

  3. #13
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    Quote Originally Posted by rwd View Post
    the flow of 2jz stock head that Erin Carpenter flowed is not same as my friend 2jz stock head?

    for intake port ,at .400, my friend had 215cfm and after port&polish he had 234cfm???

    bizarre

    That is part of the problem with comparing flow numbers. People have reported their 2JZs flowing anywhere from 215-250 stock just because of differences in flowbench calibrations (with 230 being the average). Since Erin Carpenter presumably flowed both heads on the same equipment -- then the percent differences (at that one lift) should be accurate. Still, the 1JZ data is woefully lacking, and I welcome any new information/numbers that people may have.

  4. #14
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    i am not to sure how that keeps happening with the rumor about the 1J. the only thing the 1J head has over the 2J is air Velocity as i understand it. it may flow less but it flows the air at a higher velocity. That's what i have understood from tid bits here and there i don't know if anyone has data to back this up. Possibly this theory is based on the shape of the ports. not to sure anymore.
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  5. #15
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    Quote Originally Posted by bobiseverywhere View Post
    i am not to sure how that keeps happening with the rumor about the 1J. the only thing the 1J head has over the 2J is air Velocity as i understand it. it may flow less but it flows the air at a higher velocity. That's what i have understood from tid bits here and there i don't know if anyone has data to back this up. Possibly this theory is based on the shape of the ports. not to sure anymore.
    If you look at the 1jz ports (intake) vs the 2jz, you'll see why the velocity is higher. The ports are smaller and with smaller ports you'll have higher velocity with similar flow (lower lifts). But of course with a smaller port and you run out of flow faster then the larger.

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  6. #16
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    if i port&polish 1j head, is it possible to acheive the same results as 2j

    i think 2j can flow about 300cfm with crazy job

  7. #17
    Droppin that JZ in soon!
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    Anyone notice the difference in flow when it comes to intake and exhaust when comparing the 7m and 1j? 7m looks much better than the 1j for exhaust and the 1j looks better than the 7m for intake.
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  8. #18
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    Head job (port & polish) should be done only when you wanna push
    big HP numbers...
    Some guys stated that a ported head will start to 'pay off'
    only after 700-800 whp...at least on a JZ engines
    Till then the stock head is more than ok
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  9. #19
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    good info for the 2JZGE. I'm surprised how close the 2JZGE is to the GTE despite the obvious differences in heads.

  10. #20
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    Default Re: Supra Head Flow (5M,7M,1JZ,2JZGE,2JZGTE)

    We know we can make 700WHP+ on most of those heads stock flow. I wonder what the limit would be for the 1JZ exhaust port assumed max flow.

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