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Mods & Performance Forum Thread, compression ratio vs. octane in Help / Advice, How-To's & Performance; so ya, i am thinking of getting a high compression piston or dropping the compression ...
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Old 08-16-2008, 08:01 PM   #1 (permalink)
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Cool compression ratio vs. octane
so ya, i am thinking of getting a high compression piston or dropping the compression down to 7.5:1 and getting pressurized air

now i need to know what octane to run and see what compression ratio i want to run
i have an aluminum air cooled head(as if you didn't know)
what else effects the level of octane you need to get?

i want to get the highest compression i can with out my engine dieseling
i am probably going to be stuck with pump gas though... maybe through in some octane booster
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Old 08-16-2008, 08:42 PM   #2 (permalink)
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heat and pressure are really the only 2 factors i think
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Old 08-16-2008, 09:12 PM   #3 (permalink)
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heat and elevation (air pressure) atv got it. and of course the way your bike is set up, i mean your compression ratio. idk what your supposed to run, i would just see if it pings on you, and if not, your good. i run 91 and nothing else though
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Old 08-16-2008, 09:39 PM   #4 (permalink)
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i'm still trying to convince my dad his miata doesnt need prem gas
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Old 08-16-2008, 09:44 PM   #5 (permalink)
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lol, why does he think that?
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Old 08-16-2008, 10:00 PM   #6 (permalink)
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i cant honestly tell you, i guess he thinks it's special
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Old 08-16-2008, 10:25 PM   #7 (permalink)
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well its a great car, but not engine wise. weight wise
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Old 08-16-2008, 10:47 PM   #8 (permalink)
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for your bike 86 oughta be fine turtle, hell even my bike doesnt ping on 86 and Im about twice what you are compression wise.
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Old 08-16-2008, 10:55 PM   #9 (permalink)
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how hard do you ride your bike wr? is your compression good? just a friendly question. my manual (i have read the whole thing) says 90 but the manual plays it real safe. but so do i, so i run 91
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Old 08-16-2008, 11:12 PM   #10 (permalink)
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depends on the day.
today? not really
other days? ive goter pinned.
my compression is perfect.
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