compression question

[PRRedCelicaGT]

Does anybody know what the compression should be on a 1zz after going with lower compression pistons wisecos 8.8.1?? Is there anyway to calculate this?

[Smaay]

probably in the 160 range. im sure there is a formula to calculate this but i dont know it. but engines like the 3S-GTE and 2JZ-GTE that have 8.5 compression are in the 160 range

[deltaB]

I found an online calculator once.

I tried since then but no luck. It used the intake valve closing timing as part of the equation.

................

This one might work if you set the boost pressure and altitude to zero (or set altitude to where you are) It gives cranking pressure in the results but I can't vouch for it.

http://www.rbracing-rsr.com/comprAdvHD.htm

The valve closing specs are out there somewhere. I don't know what the rod lengths are.


dB

[PRRedCelicaGT]

ok...thanks I'll look into it.....