Anyone running AV gas or unleaded racing fuel at the track ? If so any problems ?

 

I have used Aviation 100 LL (low lead) Gasoline. Works great in engines up to 12.0:1 static compression ratio.

Would work ok in mild turbo and supercharged boosted engines too.

For racing use, I would use a few gallons of 110 motor octane or higher race gas with LL Av gas.

Like 15 gallons of 100 LL AV Gas mixed with 5 gallons of 110 motor octane race fuel.

Or 3 : 1 ratio.

BR

 

What would the advantage be over something like 100 unleaded?

 

av fuel is not a fuel designed for racing and hi perf engines. it has misled many by the hi octane #s. think about an airplane engine for a moment, low compression, low rpm, hi altitude, low temps, ect. av fuel contains different detergents, altitude stabilizers, ect. the burn does not generate the same energy as a race fuel or even a hi perf pump gas. i could go on but i know you get what i am sayin. the hi perf pump gas is good but a lil expensive i think. i would go with a race gas if trackin demanded it. above reply was sayin av was good for boost. i would agree to the fact that boost requires higher octane to protect pre detonation that can come from an av fuel. but you can get more hp and a better tune from a race fuel. i have used them all. just my .02 motodog

 

From what I remember av gas is a long chain molecule that has less energy release than our normal gas. Plus with the lead it can foul your o2 sensors. It was also easier to get race gas than av gas when I had my turbo car.

 

I use it in my lawn mower. 50/50 with Mo-gas.

Yard engines run better and the fuel lasts longer before it varnishes.



In the car, not a chance. No advantage.

 

I have used 100 LL AV Gasoline for over 15 years and 10,000 street and track miles in my 1970 1/2 Pontiac Trans Am.

It has a 600 Horse Power Pontiac Ram Air 4 engine custom built by me. Normally Aspirated. No Power adders.

Has enough Power to break the rear tires loose at 100mph in high gear(4th). Verified by people following me at 100mph and flooring the gas. Left rear tire rubber on their windshields. Lots of it.

That engine has 310 Psi cranking compression checked with a Snap On Compression Gauge. Ignition disabled, 2 revolutions of crankshaft turned over by the starter motor.

12:1 static compression ratio.

Never had any detonation problems using 100 LL AV Gas.

To say Aviation gasoline wont make any Horsepower like pump gas or race gas is not true.

It burns much cleaner that any cheap tainted pump gas you can buy near your home.

Makes as much HP as most race gases unless you get the Super High Octane 114-118 Motor octane Race fuel that costs $11-15 per gallon.

Have used those fuels in my 1970 1/2 Trans Am too.

Have some experience with 100 LL AV gas after using it for over 10,000 miles. LOL

BR

 

Lower Cost to buy per gallon, 100 LL AV Gas Vs. 100 + Race gasoline.

From 1994- 2005 100 LL AV Gas was $2.06 per gallon at my local Airport. Went up to $2.50 per gallon after 2005. Its around $3.00 per gallon now.

Race 100 + octane race fuel was $3.75 per gallon up to 2007.

Race gasoline is now $7-8 per gallon for 100 + motor octane.

The Super High Motor Octane Race Gas 114-118 + is $11 to $15 per gallon.

Its more expensive than ever to go fast. Need decent gasoline to protect your engine from the devastating effects of detonation.

Cheap pump gasoline is only going to get worse and very soon with E15 gasoline coming soon.

 

Do these available race gasolines have lead added? Also, what level of alcohol is added to the currently available race gasolines?

 

There is no alcohol added to Race Gasoline or 100 LL AV Gas.

They use real Tetraetheyle Lead in High octane race fuels. And 100 LL AV gas.

There are Unleaded high octane race gasoline you can buy, its expensive, for O2 equipped cars.

You can use leaded race gas with O2 sensors. But you have to change out the O2 sensors often. About every other race. Heated wide band o2 sensors last longer with leaded gasoline fuels. But still need to changed out occasionally.

 

Run 91 octane with a little 100 unleaded mixed in thats plenty.

Too much octane can slow you down.

sheesh
My gauges only go to 300

 

In the past I had used "Av gas"l for years. I used what was refered to as 115-145 and had purple dye to determine fuel octane. In the day it was the only high octane fuel available but was no lead. To have some lead for lubrication I used to mix it approx. 50-50 with 108 union 76 racing gas. This fuel combination supported the 14:1 motors that I was running at the time...but was really the only choice. In the 70's-80's I was paying about $1.00 a gallon for the union 76 racing and about $1.25 for the av gas. By the late 80's, the 145 locally was difficult to find due to the fact that there were so few twin engine prop planes that required that fuel. You can still however purchase the 110 (yellow dyed here) fuel.
Today however, everyone around here that runs the big pop 15:1+ cr. type motors uses the VP fuel C16 (depending on app. q16) and is leaded fuel. They also make a no-lead high octane fuel for other applications. Unfortunately, the c16 is $80.00 for 5 gallons...so it is pricey these days to support big compression motors, and other serious race motors.
http://www.vpracingfuels.com/vp-drag-racing.html

 

I worked on Lycoming's new EFI engine.

We had to make it run w/o oxygen sensors

Avgas was just killing them.

 

I would look into e85, Corn fuel make sure you do your home work.

 

Huh ????

 

Great info, Mick. Thanks

I also used to run the purple 115-145 AV gas in my 62 Vette which had a 1965 375 fulie engine in it. It seemed to work fine at the time and I did not notice any negative effects. But, as you said, its not been around now for years.

 

E85 fuel typically has 100-plus octane ratings

 

Why not just add whiskey.

A little for the tank, a little for me.
A little for the tank, a little for me.
A little for the tank, a little for me.

Can't do that with "enviro" fuels

 

Yeah, but no one I know on the C4 Forum can run it.

 

Oh yes there is. I don't want to hack him name up.