legacycentral bbs

I'd like to get a USDM STi shortblock and put it in underneath my 2.2l NA heads and still run 85 or 87 octane pump gas. Using the STi 2.5l headgaskets.
Is this realistic?
Does anyone KNOW what the compression ratio would be???

does anyone know the deck height and dish of a USDM STi short block???

I've calculated the compression ratio to be approx. 11:1
with 2.2l heads on a 2.5l short block w/ stock gaskets.
Anyone have experience having done this set-up?
If so, what octane fuel are you using?
What is your power increase?

Since Kelley has managed to put EJ257 heads on an EJ22T, it must then be possible to put EJ22 heads on an EJ257.

However, if you calculated the new compression ratio at 11:1, then there's NO way you'd still be able to run 87 octane gas.

altitude my friend.
I have run a tank of half 85 half 91 up here with no noises. I just run premium anyway.
with the stock exhaust I hated it but now with something that flows ok it really woke up. next I'm getting some cams.
put some cams in the motor when you originally build the motor, wish I had.
its still not going to be a fast car in the scheme of things, mine weighs like 3200 or something but it is a good balance of features, its a good motor. lots of low end. it must haul ass at sea level.
and I know Ive said it before, but I dream of throwing this motor in an ea81 hatch, it would scream! if you could keep transmissions in it.

You might find something of use in this thread


http://forums.nasioc.com/forums/archive ... 31527.html

Siouxbie is already running handmedown Delta cams from teh Ghetto Garage...

Plus, what 206er said. Up here at 5000ft, we get to cheat. 11:1 CR will do all right on 97 octane, though it will be most happiest on a blend of 91 and 87...