Highest CR on 98 octane fuel

**94vtirozguy** · 05-01-2004 07:00 PM

What is the highest CR you can run on optimax / mobil 8000 fuel safely ?

**Setanta** · 05-01-2004 10:44 PM

I run the stock 10.5:1 of my B16A on it - I doubt I'd run 11:1 on it though without being worried.

**[[d a n n y]]** · 06-01-2004 12:44 AM

pete does your make 170 hp on jap fuel?

**94vtirozguy** · 06-01-2004 08:46 AM

i know 10.6:1 is easily ok because the JDM ludes run that CR and run fine over here. There are lude type S engines running on 98 octane as well adn they are 11:1.

I am wanting to know 11.5:1, 12:1 even upto 13:1 and definative answers ?

**weezer** · 06-01-2004 10:42 AM

ITRs are about 11:1 and its fine.
The higher the compression. The more precise your tuning has to be.

**Civic Type R** · 06-01-2004 11:34 AM

My memory tells me that one B16A over here has a compression on 13.7:1
It was built for a rally car and now its going into a EG hatchy.
It has a redline of 9600 !

**OLM-02R** · 06-01-2004 11:41 AM

yes optimax and mobil 98octane would be alright for 12:1 CR....we've tried it already and its fine....

**94vtirozguy** · 06-01-2004 02:17 PM

OLM-02R >> thanks ... any ideas on anything higher than runs pump fuel ?

tossing up between 12:1 CR pistons or 12.5:1 for daily driver

**OLM-02R** · 06-01-2004 02:47 PM

np 12:1 is alright for daily driver...my CR will be 12:1 soon....and i use my car daily driver to go to work....and i use it for track days and stuff....wat car and engine do u have btw??

**94vtirozguy** · 06-01-2004 03:24 PM

h22a1 in 94 prelude

**LatinoHatchCrap** · 06-01-2004 05:23 PM

I run 11.9 c/r and all I can tell you is that wots more important than the

fuel you use is the tuning you will get after you build the motor. You will

have to retard the timing to at least 12-13 after your build up to stop any

detonation from ocurring until you get the timing and fuel tuned. Hondata

is your friend