bore measurements

[Jard]

what would be the correct size if you were to want to run a 11.0:1 compression ratio
piston?

[Jard]

in a1jz..sorry.

[pituala]

What a vague question. Do you mean what dome size, what bore size, or what?

Your compression ratio will be an aspect of the combustion chamber volume, head gasket volume, and cylinder volume with the cylinder at BDC compared to the cylinder volume with the piston at TDC.

I believe the IS300 2J has 11:1 compression, which I would thing you could use, but I may be wrong. Why would you want high compression in a turbo motor anyway?

[rabidchimp.com]

Pick up a repair manual..and spend some time reading it. Also, why are you asking this question...you will never have a 1j in your car....never.
-Aaron, hating.

[Jard]

Because remarks like that make me wanna prove you wrong...It can be done so why not inform yourself about it from the people who have done it. Obviosly it wont be done tomorrow but its on my list of projects right next to my Sr20Det John Deere lawnmower.

[CJSREDPRA]

Jard..............

Do you REALLY want to run a 11.0:1 CR in a 1JZ-GTE?????? Do you REALLY want your motor to go KABOOM?????

There ARE reasons why peeps run much lower compressions in our M/JZ series motors in a turbo application.....

[Jard]

I'm on crack? I just wanted to here from the folks who had done it, thats all...

[pituala]

I have a 1J in my car. If anything, I would put maybe lower compression pistons (slightly) or the same compression, just stronger and lighter. A high compression turbo engine, though they can work, is more risky to detonation, and you'd have to run the timing so far in retard that you'll lose power through timing to make up a little more from cylinder pressure. Why not just run more boost into the 1JZ's current bottom end? Look at my my, stock bottom end, stock top end, only intake, dp, exhaust, fmic, stg3 clutch, and boost at 16psi and I'm running mid 12's. I can spray into the LOW 11's easily, or get a bigger single turbo and boost the crap out of the motor and make 550rwhp....pretty easily (of course I don't have the money for that right now....just making a point).

Let me ask you, what are you trying to gain from 11:1 compression?

[drftsupramk2]

jared you need to learn more about the relationship between boost and compression, fuel, ratios. Then get to a 1jz. also hopping into a high horsepower mk2 and trying to use it as a daily driver right away is not reccomended. I would build up to it first. I have been thinking about a 1jzgtte/standalone for my new mk2. I will first get used to a 6mgte first. So jared you need to read alot about this dig up old posts and then come back with the real fuel ratio you want. At that time we all will know you have done your homework and we will help you with the next step.