B18C1 with ctr piston question

[StenholmEngineering]

ok so this dude is tryin to sell me a teggy with a Gs-r and is has CTR pistons. now i was looking online and i saw that its gonna have stupid high compression. like so high that itll eventually pop usin 93 octane. seeing how you guys are full of knowledge i figured id ask you. im not sure if he is usin oem spec gaskets or not but what do you guys say???

[chagy87]

they will put you at around 12.4:1 with a oem gasket. so is the head milled at all? cuz that bumps compression up a bit

[StenholmEngineering]

i havent had a chance to ask him anything about what was done as far as head work or what gasket he used, but say the head isnt milled is 93 gas ok? will the motor last runnin on 93?

[chagy87]

i think its safe to run 93 on 12.5:1 or to be on the safe side you can us lets say like 90% gas and 10% ethanol and that gives you a higher octane rating, or E85 with is 85% ethanol and 15% gas with equals to about an octane rating of 105. i cant tell you if you gonna go boom or not but 93 should be fine for that setup. you take a risk when running a high compression engine the more compression the less your car will last like me ima be running a 15:1 compression soon and with that kind of compression i risk of blowing my motor up every time i start it.

btw i run 93 on my current set up

[LS/Vtec]

93 Gass will be fine. I see a lot of people doing it.

[Jcook2125]

yo you be good, i had 13;1 on my 2.0 gsr on 93 octane and ran it daily till rolled and still runs daily to the kid i sold it to

[chagy87]

13:1 cutting it close there huh i think that's the highest you can go without switching over to a higher octane rating with a good tune of course

[StenholmEngineering]

aight good looks yall....so just to sum it up...as long as da head aint milled and even if he used a stock HG it should be aight? i mean da whole set up like brand new...like 2000 miles but dude never drive it he work for Matco so he always workin

[StenholmEngineering]

btw i run 93 on my current set up

whats your current set up?

[chagy87]

Yea you should be good. make sure u get a list of all the things he did to it too it might come in handy to know that stuff. my compression is around 12:1 too and I be running 93. Get a tune 2.

[TurboManny]

Sunoco 91 or any 93 you'll be fine

[StenholmEngineering]

aight thanks manny!!!!

[StenholmEngineering]

ok so i talked to the guy today and he said they didnt shave the head only made sure it wasnt warped and they used a oem HG...so should be around 12.4???

[chagy87]

Yea you around 12.something now

[Herminshs]

make sure you tune it and you'll be fine