12:1 cr on 93 octane
10-20-2009, 02:03 PM
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12:1 cr on 93 octane
I'm building a motor for the first time. I want a high compression motor. I plan on putting a piston with a 12:1 cr. It will be going into a Ls. Now the question is, Can I get away with running on 93 octane or must I use race gas??
Some people that I've talked to said I could use 93 with a good tune and others have said I have to use race gas or it'll blow up. Someone help me out before I possible waste alot of money. Thanks in advanced!!!
Some people that I've talked to said I could use 93 with a good tune and others have said I have to use race gas or it'll blow up. Someone help me out before I possible waste alot of money. Thanks in advanced!!!
10-20-2009, 02:29 PM
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Re: 12:1 cr on 93 octane
I'm building a motor for the first time. I want a high compression motor. I plan on putting a piston with a 12:1 cr. It will be going into a Ls. Now the question is, Can I get away with running on 93 octane or must I use race gas??
Some people that I've talked to said I could use 93 with a good tune and others have said I have to use race gas or it'll blow up. Someone help me out before I possible waste alot of money. Thanks in advanced!!!
Some people that I've talked to said I could use 93 with a good tune and others have said I have to use race gas or it'll blow up. Someone help me out before I possible waste alot of money. Thanks in advanced!!!
you put "high compression" and "LS motor" in the same sentence. LOL
10-20-2009, 02:34 PM
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Re: 12:1 cr on 93 octane
depending on the tune, 93 should be fine. who were you talking to? old-school domestic guys? old school detroit muscle guys freak out when i tell them i run 11.5:1 on 91-93 octane... and lose their shit when i tell them i rev that to 8200. my engine is completely stock and the stock maps for the 2zz-ge run a bit rich to compensate for the high compression.
tons of bike engines are over 12:1 from the factory and run just fine on pump gas.
example: gsx-r750 is 12.8:1
tons of bike engines are over 12:1 from the factory and run just fine on pump gas.
example: gsx-r750 is 12.8:1
10-20-2009, 02:37 PM
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Re: 12:1 cr on 93 octane
depending on the tune, 93 should be fine. who were you talking to? old-school domestic guys? old school detroit muscle guys freak out when i tell them i run 11.5:1 on 91-93 octane... and lose their shit when i tell them i rev that to 8200. my engine is completely stock and the stock maps for the 2zz-ge run a bit rich to compensate for the high compression.
tons of bike engines are over 12:1 from the factory and run just fine on pump gas.
example: gsx-r750 is 12.8:1
tons of bike engines are over 12:1 from the factory and run just fine on pump gas.
example: gsx-r750 is 12.8:1
10-20-2009, 02:40 PM
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Re: 12:1 cr on 93 octane
you do realize that compression is compression right? and that with a proper tune/build a high-revving 1.8l 4banger can run 12:1 on 93 right?
i never said easy, or smart... just possible. it's going to have to be rich as hell on the fuel and very conservative on the timing.
i never said easy, or smart... just possible. it's going to have to be rich as hell on the fuel and very conservative on the timing.
Last edited by Roxtar; 10-20-2009 at 02:42 PM.
10-20-2009, 02:42 PM
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10-20-2009, 02:45 PM
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Re: 12:1 cr on 93 octane
you do realize that compression is compression right? and that with a proper tune/build a high-revving 1.8l 4banger can run 12:1 on 93 right?
i never said easy, or smart... just possible. it's going to have to be rich as hell on the fuel and very conservative on the timing.
i never said easy, or smart... just possible. it's going to have to be rich as hell on the fuel and very conservative on the timing.
10-20-2009, 02:45 PM
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Re: 12:1 cr on 93 octane
depending on the tune, 93 should be fine. who were you talking to? old-school domestic guys? old school detroit muscle guys freak out when i tell them i run 11.5:1 on 91-93 octane... and lose their shit when i tell them i rev that to 8200. my engine is completely stock and the stock maps for the 2zz-ge run a bit rich to compensate for the high compression.
tons of bike engines are over 12:1 from the factory and run just fine on pump gas.
example: gsx-r750 is 12.8:1
tons of bike engines are over 12:1 from the factory and run just fine on pump gas.
example: gsx-r750 is 12.8:1
But you said you're reving to 8200 on a stock motor??
Won't that mess up the bearings or something??