My source of non-ethanol gas has dried up--gone to ethanol gas--and I was wondering if you could run 130 octane aviation gas in older (1987) 9.9 hp outboards, or is the octane too high? The av gas doesn't contain ethanol.
Printable View
My source of non-ethanol gas has dried up--gone to ethanol gas--and I was wondering if you could run 130 octane aviation gas in older (1987) 9.9 hp outboards, or is the octane too high? The av gas doesn't contain ethanol.
isnt' that a bit expensive? If I understand octane correctly you'd need hotter plugs just to ignite it as higher octane means harder to spark. So hotter coil/plugs. Not sure on performance but I'd think it would run higher pressures as well. Not sure why I think that tho...
My un-educated guess would be that it's a bit to much power/punch of a fuel for engines not setup for it...someone with more experience might correct me as that's just a guess based on my limited knowlege of AVGas.
You are right on Pomoxis. Very few outboards are engineered to run on even 93 octane. You are just wasting your money doing so.
Drive over to Batesville. There are still 2 stores that sell gas that do not contain ethanol.
Unless you all know something about Av gas I don't, their isn't much difference in the fuels. Av gas is refined drier(no moisture). Lot colder at 5k/ft, don't want freeze up. Not sure today, but 20yr ago their was two fuels 100octLL (low lead) and 87oct. The 87oct may have been discontinued as the old engines phased out, so the 100ll maybe all you can get. I would think the 100ll would run just fine. I have never heard 130oct. not in gen. av.Quote:
Originally Posted by MaggiesMaster
Aviation gas is kerosine isnt it?:confused: If thats what I think it is dont run it, sure to blow your motor, runs too hot.
No You Are Thanking Of Jet Fuel To Run Av Gas You Need A Lot Of Compression And Good Hot Fire. We Use To Run Av Gas Our Drag Car Some Times.
Jim I don't think so. Aircraft engines are not high comp. They are designed for endurance. 100oct LL (low lead) wouldn't need big comp. to operate. The smaller aircraft, c-150's,172's and 182's are now aproved to burn auto fuel. The only change was valve seats and guides.Quote:
Originally Posted by jimmy swanson
Funny, but some jet fuel is actually not as good as other fuels.
Slipedcork has it right. Jet fuel is kerosene thats refined to higher standards. Mainly its drier.Quote:
Originally Posted by Crappie Reaper
Don't do it, stick with the mogas. I have seen 115-145 melt a carberator into the intake on a car, there is a difference in aviation and racing fuel. It can be cut with reg gas and run,but wouldn't make sense unless you got it free. And yes Jet Fuel Jp-8, 4 is Kerosene based.
AvGas is gasoline and as said above intended to be free of moisture, actual octane today unknown.
Jet fuel is Kerosene.
we get airplane fuel to run in our strip cars and all we have is 100 or 87 octane at our local airport .
the guy at the airport said the only differance is that the air fuel has oxidizers in it so it burns cleaner and better at high altitude . so if you would be running nitrous it would be a bad thing burn the pistons out . but he also told us that it was something he would run in his lawn mower adn any small engine said it cleans them out and is good for winter storage also . thats just what the fella told us at the port . best of luck and i have heard that all gas and yes i said all gas contains some level of ethenal they have been mixixng it in since the 80's if someone knows anyone from a refinery they can tell ya .
just my 2 cents,
Scott