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Thread: High compression high RPM 7M-GE build

  1. #21
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    Quin's Avatar
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    Default Re: High compression high RPM 7M-GE build

    IJs 7M ran on LPG at one point.

  2. #22
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    Default Re: High compression high RPM 7M-GE build

    Quote Originally Posted by Quin View Post
    IJs 7M ran on LPG at one point.
    Ah, I didn't know that. By the time I came around here and had my Supra I don't think he had a Supra anymore. I feel like I missed out on something.

  3. #23
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    Default Re: High compression high RPM 7M-GE build

    I'm not on here as much as I used to be, but it's good to see people still playing with the NA setups. Do us all a favor and get a good microphone for when it's running well?
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  4. #24
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    Default Re: High compression high RPM 7M-GE build

    How are you going to handle PCV?
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  5. #25
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    Default Re: High compression high RPM 7M-GE build

    Quote Originally Posted by Silver MK3 View Post
    Ah, I didn't know that. By the time I came around here and had my Supra I don't think he had a Supra anymore. I feel like I missed out on something.
    IJs build thread was... huge, instructive, occasionally funny, overflowing with car part/shop porn, and... huge. I would even say legendary.
    multiple built heads, multiple turbo setups, MOTEC with LPG and custom injection stuff... I liked that it was all function first, form second.

    But I don't think he likes a lot of attention. He'd prefer we stay off his lawn.

    Anyway, while I'm in here, nice build! I like the fabrication.

  6. #26
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    Default Re: High compression high RPM 7M-GE build

    Quote Originally Posted by Poodles View Post
    How are you going to handle PCV?
    Good question. Im going to deal with the blowby gasses straight out of the crankcase, it is 'positive CRANKCASE ventilation' after all. I cant really see the need to bring the blowby gasses out of the block, and into the front of the cam cover only to pull it out the back of the cam cover again. I also dont see how there would be any blowby generated in the head itsellf. I plan to run a hose from the fitting on the block to an external oil header tank/catch can/air separator/fill point.
    Ill probably fit a temporary pressure gauge to the head and block to make sure nothing is amiss with this setup but i think it will work fine. I actually end up with more area this way than the 2 pissy outlets on the factory cam covers anyway.

    RPM wise i will turn it to 8500 and if it is still making power maybe 9000, but no higher. Not on a 91mm stroke, not when you do the math on piston speed. 10k rpm is well PAST hand grenade territory IMO.


    Yeah LPG is great fun, ive been running it for years. It has a bad name here in oz because most people set it up wrong so the car drives like shit, but you cant beat it for octane, and setup right it goes very well. Plus it's half the price of regular unleaded... I'd love to go down the ITB + liquid LPG injection route, but it is a lot of $ and i would much prefer direct injection into the chambers than the ports, so more development is needed first. Ill stick with my trusty Impco 425 carby for now.


    A little more progress on the build, i got the crank washed and installed for hopefully the last time. I went through 5 litres of Prepsol washing the block, and another litre on the crank.... i do like to work clean :-)
    I also started to make a new retention plate for the auxiliary shaft but unfortunately didnt get it finished before i had to go out for the night so pics will have to wait a couple of days...

  7. #27
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    Default Re: High compression high RPM 7M-GE build

    Oh yeah, what are people doing about Eagle rods and no squirters? With no lube hole in the big end i cant see a lot of oil getting to the pin, or even the bores for that matter. The small ends have 2 holes drilled, but i dont imagine they will do much without oil squirters.

  8. #28
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    Default Re: High compression high RPM 7M-GE build

    ^ one of the reasons I'm running squirters so my pauters will get oil.

    You do not need pcv vents on the cam covers but routing pcv to the head has its advantages. It mainly helps push oil back down to the block.

    Sent from my SPH-L720 using Tapatalk
    rebuild in progress...

  9. #29
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    Default Re: High compression high RPM 7M-GE build

    Very nice.. just realized another aussie!! and you live in my area :3

  10. #30
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    Default Re: High compression high RPM 7M-GE build

    What about negative crankcase ventilation using a smog pump?

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