what gas octane needed
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Junior User
Joined: Jun 2002
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From: Trivoli IL
what gas octane needed
I building a 514 engine that has 11.8 compression and I wonder i premium gas 93 octane and octane booster will be enough because I want to be able to drive down the road and not have to run racing fuel
Senior User
Joined: Sep 2002
Posts: 321
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From: kansas
what gas octane needed
No
I would guesstimate you'll need about 105 octane fuel. Which is about 5-6 dollars a gallon and for off-road use only. You might could lower that by getting a big lumpy cam that will bleed off compression through vavle overlap. The problem is it'll run terrible at anything below 3-4 thousand rpm.
If you want to drive it, get the compression down to at least 10:1 or maybe 10.5:1 with a slightly lumpy cam. This assumes however that you're using aluminum cylinder heads. If not, drop it an additional .5 to 1, if you use an aluminum block you could raise it .5 to 1 but I doubt you'll like the price tag on that block.
By the way if you add a bottle of octane booster to gas it raises it 2 points right? Wrong. Read the bottle carefully, it's actually going to raise it .2 to 1, sucks don't it. You're 93 becomes 93.2 octane fuel.
I would guesstimate you'll need about 105 octane fuel. Which is about 5-6 dollars a gallon and for off-road use only. You might could lower that by getting a big lumpy cam that will bleed off compression through vavle overlap. The problem is it'll run terrible at anything below 3-4 thousand rpm.
If you want to drive it, get the compression down to at least 10:1 or maybe 10.5:1 with a slightly lumpy cam. This assumes however that you're using aluminum cylinder heads. If not, drop it an additional .5 to 1, if you use an aluminum block you could raise it .5 to 1 but I doubt you'll like the price tag on that block.
By the way if you add a bottle of octane booster to gas it raises it 2 points right? Wrong. Read the bottle carefully, it's actually going to raise it .2 to 1, sucks don't it. You're 93 becomes 93.2 octane fuel.
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