RaymonEbbs

Some guy came up to me at work one day and started to blab about some kind of gas he called av gas which i think means avation gas n/e ways he told me to put 2 gals of it with a full tank of gas and it would clean out my fuel system. i was wondering what you guys thought about this thanks for the advice in advance

Shutemup

It's considerabely higher octane.

Turtle256

and very pricey .....

Jay W

Using fuel injector cleaner does all the fuel system cleaning you need, and its easier than going to the local airport to fill the car up. The higher octane aviation fuel will make the car run better on that tank, but I cant see any improvement after it is used up. Had a friend of mine dump AV gas into his Chevelle SS 396 and immediately blew up a muncie 4 speed transmission while gunning it onto a highway.

Shutemup

http://www.osbornauto.com/racing/race2avgas.htm

I didn't know it was thinner than regular gas or that the octane ratings were obtained differently.

M758

Lots of Lead in Av Gas.

Rich Sandor

Avgas is 100LL (low lead) aviation fuel. The non-leaded aviation fuels are not commonly found at most general aviation airports.

Do not use 100LL avgas in your car. The label on your gas flapper and dash cluster should clearly say "UNLEADED GAS ONLY"

Avgas has a different chemical composition than mogas, it actually has a different weight as well. In aviation we multiply the amount in gallons by 6 to get the weight in lbs. Besides the different level of sulfur and other chemicals, the lead content will eventually destroy your cat. Also, 100LL is generally much more expensive than 91 or even 94 octane mogas. (unless somone overfilled an aircraft and is draining the fuel into a container.. but why would you want to use potentially contaminated fuel?)

If you want to clean out your fuel system, buy a bottle of fuel injector cleaner.

Porsche-O-Phile

Your CHTs and EGTs will run considerably higher as well - good chance for engine damage.

RaymonEbbs

thanks alot for the input i knew somthing was up with the whole thing i didnt know any thing about it so i thought i would ask about it.

Campeck

what if you have a gutted cat? Is leaded gas a problem then?

Chris_924s

It will run faster, burn better- but keep an eye on the plugs.

faithless

Pure common sense.

I guess if somebody started yaking about that to me, I would be curious as well. Thats why it always pays to post it up on Rennlist!

Dave951M

Chevron fuel has Techron in it, recommended by Porsche IIRC. Also, if you're interested in a for real octane boost, try using Toluene, available at most fine paint stores by the gallon.

Danno

Unless you've tuned the car to run on 100-octane fuel, like increasing compression or turning up the boost, there's no way you can get more HP from just dumping in AvGas. The combustion temp and speed is exactly the same as auto-gas if you maintain the same air-fuel ratio. However, due to AvGas being 25% lower in density than auto-gas, you'll be running too lean. THIS is what causes the hotter combustion and potential engine-damage. You can get the same effect by leaning out the mixtures on your existing gas... Remember that hot-rod saying from the '60s???

Dilberto

Now what will fighter jet fuel (JP4) do to a car?