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Race Fuel or Aircraft Fuel

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klmnla

Watson LA
Joined
Feb 22, 2008
Messages
370
What is the difference and can either fuel be ran in a low-mod GN? I want to try a few gallons of some real octane to see if the KR goes away at WOT. I had some folks tell me to go get some aircraft fuel at the airport, and some advise to find a local source of racing fuel. :confused:
 
Most racing gas above 100 octane contains lead.
Aircraft gas as a general rule contains way more lead than racing gas, and is designed for altitudes higher than our cars generally run.
 
Buy an Alky Control alcohol system and be done with it. We are running 10.03 @134+ on pump gas and alcohol. Best race gas for the dollar. 100 octane racing unleaded is a good choice for mild performance tuning. But, stepping up to an alcohol system is the way to go. Octane on demand.

Aviation fuel has addatives in it to control high altitude burn issues and congealing. I use to run better on pump gas than I did on 100LL av gas. 115/145 av gas would work great, but it is only available by the tanker truck load. (I tried to order some years ago and they said it was available and wanted to know how many TRUCK loads I wanted.:eek: I said I only need 10 gallons..........There was silence on the other end of the phone. "Uh......we only sell it by the truck load for the Reno Air Race guys. They're the only ones that NEED that stuff anymore."
We use to run that in unlimited hydroplanes WITH an addative in it. But we went through 65 gallons in 4 minutes, and DID need a tanker truck load at the race site.;)
 
What is the difference and can either fuel be ran in a low-mod GN? I want to try a few gallons of some real octane to see if the KR goes away at WOT. I had some folks tell me to go get some aircraft fuel at the airport, and some advise to find a local source of racing fuel. :confused:

I think the real question is why are you getting KR
 
I do believe the Alky kit is next on my list. We talked about the KR issue on my post a few spots down titled " knock knock ". I did some boost adjusting and testing, only to conclude that I need alcohol.
 
Race fuel all the way!...I've never tried aviation fuel, but have heard the same comments as the ones in the previous posts. I did try mixing some xylene with regular fuel for street driving with decent results, but for any kind of serious performance, NOTHING beats race gas!:wink:

Claude. :cool:
 
I have ran AVgas in all kinds of vehicles for over 15 years.....NO issues what so ever.
I run it in my current "Sand National" sand rail powered by a Turbo Buick at over 20 psi.It loves it.It will eat o2 sensors but so will any leaded race fuel.
 
Most racing gas above 100 octane contains lead.
Aircraft gas as a general rule contains way more lead than racing gas, and is designed for altitudes higher than our cars generally run.

Very common misconception.....when does a plane need its most horsepower???
Leaving the ground maybe!!!
 
Very common misconception.....when does a plane need its most horsepower???
Leaving the ground maybe!!!

My plane needs most of its horse power whenever I push the throttle regardless of altitude, The C172 I fly runs 110LL "Low Lead" and it still has four times the amount of lead as race gas. Some aviation fuel contains an additive to keep the fuel from freezing at high altitudes. Buy an alky kit. Race gas and AV gas will work just eat O2's. Remeber lead was a lubricant in fuels and was only taken out for O2 sensors and save the environment blah blah. Eric.
 
Thats not what the tech offcial told me at my local drag strip.He asked what I was running years ago because they couldnt place it.....it was so much alike VP 108..just cleaner they said.
Lead is part of the anti knock compound.
I see your sig...71 Monte??? I have one also with a 468.
 
we run avgas just for the drags its great stuff even at 10:1 fuel ratio its soot free and easy to fire no plug fowling etc
10:1 and the turbine wheel and manifolds look clean as a whistle
IMGP4839.jpg
 
Those with Airplane fuel experience, a buddy of mine said to never run the left over fuel from a plane (in a performance vehicle) due to the molecule change it goes through while in the air etc. He has access to it (free) but I'm not interested due to the above. What say you?

I guess the answer above would mean, only get new AV fuel if you go this route.
 
never heard of that.I just dont think a 100LL powered plane can go high enough to change the molecular structure.
Not sure on this one.
 
av gas

is DESIGNED to be slow burning, majority of aircraft only turn 2600 to 2800 rpm, so if your gonna keep the rpm down I'd say use it,
but if you plan to use more rpm, then I'd just use fuel designed for that use!

yrs ago I worked for Hooker headers design shop, we did some testing at OCIR ( yea it was that long ago)we ran a super stock camaro on pump gas, on av gas and on race fuel, all the same day with in few hrs of each other,
the car LOST 3 tenths with av gas! it ran fastest with race gas.

you decide whats best for you.
 
All high octane fuels are designed to be slow burning(except for the newer oxidized fuels)...thats what makes them work.
Did you adjust mixture and timing or just empty the tank and refill it with the different kinds of fuel???

If you didnt optimize for each fuel than thats not a fair comparison at all.
 
I've got to call BS on the molecular change thing. That would mean that every time a pilot goes for a flight and lands that the fuel is no longer good? :rolleyes: I'm pretty sure I've never seen pilots draining their fuel at their tie downs and refilling with fresh gas at every flight.
 
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