Questions about compression #s

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Feb 18, 2009 | 12:49 PM

zmaniv

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SuperSport

Joined: Jun 2008

Posts: 916

From: San Diego

Questions about compression #s

In California we are only able to get 91 octane fuel is this going to be a problem if I choose to run the JE pistons and Mori stage 1 cams?

Feb 19, 2009 | 03:17 PM

motojoe

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From: Mother Earth- orbiting around Charlotte, NC. But now over the border in S.C.

motojoe is an unknown quantity at this point

No, because you can buy a can of higher octane(race fuel) and mix it with your pump gas like motocrossers. We do it all the time. Some guys I know have 13:1 + comp. ratios.

Feb 20, 2009 | 02:35 PM

zmaniv

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SuperSport

Joined: Jun 2008

Posts: 916

From: San Diego

Thanks motojoe I didn't want to have to pull out octane booster everytime I filled up.

Feb 22, 2009 | 06:05 PM

zmaniv

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SuperSport

Joined: Jun 2008

Posts: 916

From: San Diego

Anyone else have any feedback?
I would like to keep the bike streetable (not have to carry around octane booster).

Feb 22, 2009 | 06:24 PM

cliby

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Joined: Jul 2005

Posts: 1,548

From: MN

I have Moriwaki HC pistons and stage 1 cams and full exhaust and rejetted. Not uncommonly the highest octane I can get is 91 - runs fine, I don't hear any detonation, plugs look fine.