av gas. Yes or no

[Dajkzo]

I use that **** in everything! Well other than the Kubota....
View attachment 1007056 View attachment 1007057

I have to admit, when I saw that big tank of 100LL Avgas, I got a little choked up. It's so beautiful......

 

[dadsbee]

2200 litre tank..

 

[69L48Z27]

AV Gas at my local air park is $5.10/gal. Sunoco 100 is $8.99/gal.

 

[Hemirunner]

If it works for you guys and you’re willing to put up with the hassle of it, knock yourself out but it’s completely unnecessary. I have pump 92 octane ethanol blended gas in the tank of the twin turbo hemi. Runs great. Buddy of mine just went 5.40@133 in the 1/8 with it in his twin turbo small block mustang.

 

[dadsbee]

If I had to pay at the airport (vs my wholesale deal) it's at or close to $2/litre CDN.. so $6US/US gallon and Racing fuel in 5 gallon cans up here is stupid money.

.. gotta remember there are many of us running original 50+ year old, or engines rebuilt 40+ years ago without hardened valve seats looking for lead as well as octane.

 

[DownZero]

What ratio would be best when adding av gas?

 

[33 IMP]

What ratio would be best when adding av gas?

It kinda depends on how much compression and camshaft you have. Ive got an iron head 10 1/2 to 1 engine ("11 1/2 pistons",really measure 10.5) with a stout solid lifter purple shaft cam. I can tune it to run on 91 pump, but it runs a bunch better with another five points of octane, so i mix mine somewhere around 50/50.
You might just need a couple points improvement, and you might have pump 93 available, so maybe two or three gallons in a tankful. Time to experiment!

 

[Hemirunner]

If I had to pay at the airport (vs my wholesale deal) it's at or close to $2/litre CDN.. so $6US/US gallon and Racing fuel in 5 gallon cans up here is stupid money.

.. gotta remember there are many of us running original 50+ year old, or engines rebuilt 40+ years ago without hardened valve seats looking for lead as well as octane.

I can definitely see the lead aspect being a concern. There are some very good additives available today like VP Fuels that contain octane booster and lead substitutes.

 

[MoparDanMan]

I have easy access to aviation fuel and wAs wondering if there is any benefit/downside to using it. Stock 383 4bbl. My thought was to mix it with 93 octane. Maybe help offset the ethanol content.

There are 4 different grades of Av gas, they are all expensive. Based on a stock 383 I feel you would be wasting your money. The higher the octane the slower and colder the fuel burns. So unless you are running 12:1 or higher compression, you may actually drop your horse power.

 

[MoparDanMan]

I think you mean hygroscopic.

Maybe he drives his car on the bottom of the ocean

 

[MoparDanMan]

Maybe he drives his car on the bottom of the ocean.

 

[Cranky]

All my 10.? 340 needed in the summer time was 1 gallon added to a full load and no more ping. It was supposed to be 10.3 but I'm thinking it was a bit higher than that.

 

[AJ/FormS]

I don't get it.
my 11/1, Eddie-headed, 367, went 93mph in the 660, @3457 pounds @900ft , on a hot July afternoon, burning 87E10..With my 230* cam the engine makes a tic under 180psi cranking cylinder pressure.
87E10; my engine loves that fuel.
Maybe my Tight-Quench makes mor difference than I thought.
This 68 Barracuda was my DD for many years.


IDK guys, my engine is nothing special.

 

[kiwigtx]

I have about 2 gallons left, and I use it for making up two-stroke mix for my lawnmower. It doesn't make the mower go faster, but makes the exhaust fumes smell a bit sweeter.
My A100 engine doesn't take leaded fuel. Got to use it up somewhere.

 

[tommytunes]

would

Have a built 383 10.5 stage 5 heads 509cam 4 speed. Run 5 gals AV gas top off with 93.
Runs great in Fla. 90+ heat. Pulled plugs during Covid 19 looked really good. clean, no damage, no fouling. Try it , you'll like it......................