Octane vs compression

**HouserCRF450** · 09-23-2006, 10:18 AM

I'm lookin at different compession pistons for my crf 450, what octane gas for what comp piston? I can get 99 octane from the pump over here but don't wanna have to run race fuel again as it costs a fortune over here. Lookin at 13:1 > compression

any help would be appreciated, also anyone know what comp a sparks piston is

**CHEVYZ** · 09-23-2006, 11:33 AM

I think that you would be safe with a 13:1 running 99. I run 93 in my 06 450r and it has a 12:1 without a problem. I would imagine running 99 would be fine for 13:1.

**stocktires** · 09-23-2006, 12:29 PM

What cam are you running? How fast are you?

**400eXr1d3rZ** · 09-25-2006, 05:34 PM

93 octane is ok for 13:1 compression piston.

**HouserCRF450** · 10-02-2006, 09:49 AM

Originally posted by stocktires
What cam are you running? How fast are you?

standard crf cam, A level rider

**stocktires** · 10-02-2006, 07:16 PM

Definatley dont go higher that 13:1 then (on 93 pump, on 99 it would be fine), I might would even consider a 12.5:1 if your gonna stick with a stock cam. A better rider on a stock cam can give a high compression motor more abuse than the average joe.

**HouserCRF450** · 10-03-2006, 10:00 AM

Cheers

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