Would I damage my engine if....
Thread Starter
Race Director
Joined: Jan 2001
Posts: 16,221
Likes: 118
From: Matthews NC
Would I damage my engine if....
....I put 100 octane leaded aviation fuel in my '70? I have 11:1 compression and bored .040 over, maybe more compression after the engine rebuild. I can't think of a reason why not...but there may be a caveat that I don't know about.
Melting Slicks
Joined: Mar 2008
Posts: 2,336
Likes: 1
From: North Bellmore Ny
St. Jude Donor '09
Ahh Ok, Sorry about that. I don't see how it would harm the car at all. A gas station near me sells 2 types of cam2 100 octane unleaded which you pump right in and cam2 110 leaded which you have to pump in a can. I wonder if this is a avaition gasoline aswell.
Drifting
Joined: Mar 2007
Posts: 1,936
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From: Winston-Salem NC
Avgas is 100LL(lowlead) & 110LL. Jet fuel is JetA ( with some Kerosene ) , and JP4 (what we use in fighter acft, and most other military acft). JP4 is more volital than JetA, and so is JP5.
Last edited by eagle275; Nov 24, 2008 at 11:02 PM.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I have not seen 110LL avgas- anywhere. Lots of 100LL.
I use VP 110 (12.5:1 compression) but it's like $7.00 a gallon. Avgas will be $4.85 or thereabouts. If you can get a airport to sell it to you, don't let them know it's for a car- I don't think the road use tax is paid on it and they might refuse to sell it on that basis,
I use VP 110 (12.5:1 compression) but it's like $7.00 a gallon. Avgas will be $4.85 or thereabouts. If you can get a airport to sell it to you, don't let them know it's for a car- I don't think the road use tax is paid on it and they might refuse to sell it on that basis,
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Melting Slicks
Joined: Sep 2001
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From: Fairless Hills PA.
No it won't hurt your engine.
I used to run Aviation fuel in my 70 LS-6 Chevelle back in the 70s. Never had a problem. I used to get it at a small airstrip in NJ. where my Dads buddy kept his Cesna.
I used to run Aviation fuel in my 70 LS-6 Chevelle back in the 70s. Never had a problem. I used to get it at a small airstrip in NJ. where my Dads buddy kept his Cesna.
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From: Downtown Annapolis, MD. The Future is where we all have to live. Let's not screw it up.
St. Jude Donor '08-'09-'10-'11
No, it won't hurt anything except your wallet.
Friend of mine with an L46 had a pinging problem and used it.
I would think addressing it from a timing standpoint would be a more permanent approach. Worked for him.
Friend of mine with an L46 had a pinging problem and used it.
I would think addressing it from a timing standpoint would be a more permanent approach. Worked for him.
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It won't hurt it but it's highly unlikely that your motor needs it. All of my older high compression Vettes run fine on 93 Octane pump gas. If pinging is your reason for wanting more octane I would look at your timing and carb for answers first. The factory compression ratings were a little optimistic to begin with. Your rebuild and .040 overbore shouldn't put you in a situation where you need to go to the airport for gas.
Drifting
Joined: Aug 2005
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From: League City TX
Drifting
Joined: May 2006
Posts: 1,480
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From: Circleville Ohio
I used it in my VW Back in the 80s and all four of my fuel injectors started leaking right on the rubber piece that hooked to the injector .I would not go 100% 100LL.
I worked at an F.B.O. in Col Ohio.Lane Avation
Forter Lane taugth Sky King how to fly How old are ya??? Any body remember Sky and Penny show that revolved around a 310P Sesena.
I worked at an F.B.O. in Col Ohio.Lane Avation
Forter Lane taugth Sky King how to fly How old are ya??? Any body remember Sky and Penny show that revolved around a 310P Sesena.
Pro
Joined: Mar 2004
Posts: 640
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From: Mertztown Pa
The octane rating is a measure of the resistance of gasoline and other fuels to detonation (engine knocking) in spark-ignition internal combustion engines. High-performance engines typically have higher compression ratios and are therefore more prone to detonation, so they require higher octane fuel. A lower-performance engine will not generally perform better with high-octane fuel, since the compression ratio is fixed by the engine design.
I had a pinging problem that no one could fix, 110 leaded fixed it.
Le Mans Master
Joined: Jan 2007
Posts: 5,485
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From: Peekskill NY
It won't hurt it but it's highly unlikely that your motor needs it. All of my older high compression Vettes run fine on 93 Octane pump gas. If pinging is your reason for wanting more octane I would look at your timing and carb for answers first. The factory compression ratings were a little optimistic to begin with. Your rebuild and .040 overbore shouldn't put you in a situation where you need to go to the airport for gas.
I played a bit with the timing and run regular w/no ping, even under heavy load. The engine would probably like a high octane gas more, but not my wallet.
