Compression ratio vs. fuel requirements

Jan 3, 2003 | 06:56 PM

Forcefed

Thread Starter

Range Rover
when your holding the football - people will throw evrything they can at you to strip it away .... including the waterboy at the end of the bench.

Joined: Feb 2002

Posts: 219

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Compression ratio vs. fuel requirements

I need to know what compression ratio is the cut-off for 94 octane pump fuel? ie. Can I run a 12:1 piston with 94 octane???

Jan 3, 2003 | 10:00 PM

PRAIRIETWIN

Range Rover

Joined: Jun 2002

Posts: 167

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Compression ratio vs. fuel requirements

Fuel requirements has more to do with cylinder compression ratio than a given ratio. 170lbs psi 87-89 octane-----------------------------------------------stock 250R new rebuild
175-185 psi 89-91
190-200 psi 92-94
205-210 psi 100
215-220 psi 105-108
225-230 psi 110-114 octane------------------------------------------ 250R 14 to 1 ratio with 18cc dome head

My 400 polaris 2 stroke is 160 psi

Jan 8, 2003 | 09:16 PM

chop

Pro Rider

Joined: May 2000

Posts: 389

Likes: 0

Compression ratio vs. fuel requirements

i too was wondering how high i could go on the compression ratio and still run pump gas.also,how high can you go and still have great reliability? also,who are the best hop up companies for the DS pistons and cams? THANKS.