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Ecklers AutoMotive
Username Post: Aviation Fuel        (Topic#354193)
"6th Year" Silver Supporting Member
Posts: 87
Loc: Crosby, Texas
Reg: 12-06-14
12-03-18 10:30 AM - Post#2753185    

I have spoken to a few of my friends, some say Aviation fuel is OK others say No. Running a 402 BB with Mother Thumper cam, bored 30 over. What is your input???

Ecklers AutoMotive
"6th Year" Silver Supporting Member
Posts: 1306
Loc: Houston TX
Reg: 04-15-11
12-03-18 12:26 PM - Post#2753201    
    In response to Red402

Without researching it, I was thinking jet fuel had a lower flash-point than gasoline. I remember comparing the two about 18 years ago and can't recall my findings. I also don't know about the other additives being bad or good for vehicles. I'll see what I can dig up again.

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"10th Year" Silver Supporting Member
Posts: 4750
Loc: SoCal
Reg: 12-21-01
12-03-18 01:10 PM - Post#2753208    
    In response to kingkreeton

Aviation fuel (gasoline) and jet are two different products.

Aviation fuel (gasoline) or Avgas --> is less dense, requires different carb or injector jettings, and is generally designed for very different environments than, say, racing gas. May or may not harm your engine.

Jet fuel is almost like kerosene or diesel fuel and will wreck your engine.

Why do you think your car needs aviation fuel? I doubt your car will run any better. Just use the highest octane premium gasoline.

    1967 Chevrolet Impala SS convertible 327 - Ermine White C1 - VCCA Senior Award
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Edited by BigDogSS on 12-03-18 05:09 PM. Reason for edit: No reason given.

Frequent Contributor
Posts: 1308

Age: 58
Loc: Liberty, SC
Reg: 08-06-16
12-03-18 03:10 PM - Post#2753221    
    In response to BigDogSS

I've ran race fuel before in my truck just for the added Octane boost. I've never herd of anybody running Aviation fuel though.
In fact it may not even have boosted it at all. I would run 5 gallons RF to 20 gallons of regular.

I use to run it in my gas golf cart as well and it ran really good and I loved the cherry smell of it!

1956 Bel Air - LT-1/4l60
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Edited by Andy4639 on 12-03-18 03:17 PM. Reason for edit: No reason given.

Frequent Contributor
Posts: 1726

Loc: Lake George, NY
Reg: 11-11-15
12-03-18 03:11 PM - Post#2753222    
    In response to Red402

Not recommended, the vaporization rate is different for high altitude use, for one. Octane ratings are based on altitude factors also

Frequent Contributor
Posts: 1007

Loc: In the garage
Reg: 08-19-14
12-03-18 11:08 PM - Post#2753292    
    In response to Red402

My answer begins with a question... what are you expecting to gain?

When I was in my teens and 20's I had some friends who ran their street / racing cars on "av gas" (their name for it). Sounded like a complete PITA to me. Drive a truck with a container(s) to a place not really setup for public sale, buy, transport, store, modify the carb, adjust timing, dispense as needed, drive, repeat. Now that I'm older I realize there are better ways to get high octane fuel. ...and even better ways to make the same power with higher efficiency parts on available pump fuel.

Call me crazy but I enjoy driving my cars, not sourcing special fuel for them. If I can't get it done with pump gas, it isn't getting done. I don't race and I can get really, really rowdy with a street car on pump fuel from the local big name station.

A big block with a (presumably by the name) big cam doesn't necessarily need high octane fuel. If you have a high compression engine and are knock limited, changing fuels makes sense. This is assuming you are knock limited for a fuel octane reason. If for example you're knock limited due to a mechanical reason, (timing, lack of fuel, too much cam, etc.) that is a problem octane won't resolve.

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Posts: 56

Loc: Bradenton, FL
Reg: 05-26-18
12-04-18 04:10 AM - Post#2753296    
    In response to Red402

Fuels are set up for what they run in. Racing gas goes up to 116 octane. Aviation gas is for airplanes and their special needs which isn't exactly what a car needs. High octane fuels allow the timing to be advanced beyond what regular fuels allow. It's basically knock control. But unless you've maximized the car to run on the stuff, it's just a waste of money.

I used to run in SCCA with a Suzuki Swift GTi with EFI. I ran the car with 100 unleaded and because the knock sensors allowed more timing, the car ran like a scalded ape.


1963 Chevrolet ?

"6th Year" Silver Supporting Member
Posts: 87
Loc: Crosby, Texas
Reg: 12-06-14
12-04-18 07:21 AM - Post#2753307    
    In response to Swifster

Thanks for the input, just a bunch of guys standing around BSing, just courious what you all would say

"3rd Year" Silver Supporting Member
Posts: 160
Loc: Hot Springs South Dakota
Reg: 04-28-12
12-04-18 10:10 AM - Post#2753332    
    In response to Red402

Aviation gas contains lead so illegal to use in an automobile. Lead would destroy a modern car catalytic converter. Avgas has a lot longer storage life than automobile gasoline so I can see why some people would want to use it in cars that sit all winter. Avgas now costs around $5.00 per gallon. I worked at an airport back in the 60's and I ran avgas in my 62 chevy with 10.5 compression. 100 octane and never a knocking problem.

Posts: 27999
Loc: San Francisco, CA
Reg: 11-26-02
12-04-18 11:14 AM - Post#2753337    
    In response to Red402

Back in the day, I had a few rodder friends who ran aviation gasoline because they had ungodly high compression ratios which wouldn't run on anything else without pinging. AFAIK, it never seemed to cause any problems for their engines.

However, keep in mind that this was back when lead was "normal" in almost all automotive fuels because it was the cheapest way for refiners to gain octane. The one notable exception was Amoco premium, which was lead-free, and was the fuel of choice for Coleman camping lanterns and stoves. Coleman cautioned users to avoid using leaded fuel because it would build up deposits that could clog a tiny orifice in the fuel vaporizer of these appliances. I don't know if this was true or not, but I didn't want to take any chances. Some of you older guys here might remember this.


Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.

Senior Member
Posts: 908

Loc: Montana
Reg: 12-04-02
12-04-18 02:03 PM - Post#2753355    
    In response to Red402

Back in the day I ran Avgas in my 64/409. 11:1 pistons. It would ping on the best premium so I would blend 50% avgas with it. At that time the avgas was 100/130 with high lead content. That is not available anymore. 100 low lead is all that the local airports have.

At that time I had a high compression 454 in my 71 K10. I used the same 50/50 blend in it.

1964 SS 409/340 4 spd, bought new Oct '63 from Ken Boggs Chevrolet, Geraldine, Montana

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