Aviation Gas

[Karl Bebout]

I had good results with AV gas in my first Cobra. 496 Chevy 11 to 1 engine/ alum. heads. I'd add one ounce of Marvel Mystery Oil, per gallon and had good results, even when using a 100 hp dose of nitrous. I'd read that the MMO helped lubricate the valves when running AV gas. My 2¢. BTW, smelled great and turned the insides of the exhaust exit nice light grey. Just like de ole daze.

[nathanmargolis]

Thanks for the input. From additional research, it looks like there is too much lead in Aviation gas that would not be good for a modern built engine. The added octane would be nice and most high performance engines would love it but the lead over a period of time would do damage to valves and valve stems and guess carbon up the pistons.

Will back a trip to Buc-ees in Texas and fill up when possible on their ethanol free gasoline.

Once again, thanks for the feed back.

[desgros@vtlink.]

Aviation gas in my 289 ERA Cobra allows the motor to run extremely well. In addition longtime storage (long Vermont winters) is not a problem.






John

ERA 289 Cobra #3010 Slabside BRG

[hauss]

Originally Posted by Karl Bebout

I had good results with AV gas in my first Cobra. 496 Chevy 11 to 1 engine/ alum. heads. I'd add one ounce of Marvel Mystery Oil, per gallon and had good results, even when using a 100 hp dose of nitrous. I'd read that the MMO helped lubricate the valves when running AV gas. My 2¢. BTW, smelled great and turned the insides of the exhaust exit nice light grey. Just like de ole daze.

You said light grey? I would pull my plugs,sounds like you are melting your pistons. The plugs should be tan like the skid marks on your underwheare after driving a cobra with 600hp!

[Varmit]

I've run a mixture of Av gas and 91 0ctane in my 482 bb for some time. Never had a problem, untill. Recently I put 10 gallons of av gas with only about two gallons of 91 octane. Car began running really bad like it was flooding. Problem. Av gas is designed to be run at altitude, thus it has a higher density. If you dont adjust the floats running a high percentage of
av gas, you will have this problem. Once it got mixed with 91 again the car ran perfect.

[patrickt]

Originally Posted by Varmit

Av gas is designed to be run at altitude, thus it has a higher density. If you dont adjust the floats running a high percentage of
av gas, you will have this problem.

Most people would never even think of that. Here's more detail on that exact point: https://www.fuelexpert.co.za/canirunavgas.php