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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?? :D :D

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 :)

ALLMTR
06-01-2004, 08:20 PM
I wouldn't go over 12 to 1 on pump gas

Civic Type R
07-01-2004, 12:25 PM
I wouldn't go over 12 to 1 on pump gas
True !
however, my friend over here has informed me he intends to use his 13.x compressed B16A as a daily driver ... :shock:
I told him good luck finding fuel

pornstar
07-01-2004, 02:26 PM
ive used 13:1 CR pistons before on optimax, but now having read this post, im not sure if the headgaskest lowered this a little..

LatinoHatchCrap
07-01-2004, 03:16 PM
ive used 13:1 CR pistons before on optimax, but now having read this post, im not sure if the headgaskest lowered this a little.. Its all in tuning mate. But 13:1 its kinda high anything over 12:1 will begin to affect the driveability.

ginganggooly
07-01-2004, 04:26 PM
from what i've been told, up to 12:1 and a tad higher is okay on good fuel, but the tuning is very important.

maybe someone with first hand tuning experience will want to pipe in about now :)

Setanta
07-01-2004, 10:04 PM
]]pete does your make 170 hp on jap fuel?

Mine is the first gen of B16As Danny, they onle made 160ps, not the 170ps the 2nd gen of JDM B16As made.