Anyone run 100LL A gas in a 4-mix?

[av8or3]

Torco is the product I used. But back in 2004 it cost a lot less. I could buy 5 gals for what you’d have to pay for 64 oz. now.

 

[Mad Professor]

Here’s something on Tolulene.

Google Search

I just happened to think. Coats your exhaust reddish brown.

Toluene.

Xylene or mestislene works better. 1,2-, 1-3 or 1-4- di-methyl benzene isomers or isomers of tri-methyl benzene

 

[Mad Professor]

I used to think the additional lead would help cool and cushion the valves.

It lubricates the valve seats

It was used as an anti-knock compound in autos (and aircraft as well) and worked great,at that.

Yes raises octane.Tetraethyllead

In the ope I see here the lead has built up to a point where the valves no longer seal. The engine won’t start. You can work the valves in and out with Kroil in the combustion chamber and sometimes knock enough loose that the engine starts.

BS!!! Lead is soft. AV gas was long recommended as fuel in Chevy Power published by GM for race engines. I ran it for many years in a 12:1 SBC, decked and head surfaced 69 LT1 350

After running a tank of unleaded thru it it runs and will once again start.
The 100 Low Lead fuel contains SEVEN times the lead in it that Premium auto gas used to have in it. That’s a lot of lead. Most normally aspirated aircraft engines can be run on car gas, however, turbo equipped engines cannot be.

Nope. early radial aircraft did not have hardened vale seats and needed the lead for the valve seats, early cars/trucks/tractors too. They could run on low octane red colored AV gas that was lower octane than cheap pump gas.

By law AV gas, has the tanked scavenged /pumped for water every day to ensure no moisture is in the fuel. If a fuel line freezes, the plane goes down. That is true fror red low octane AV gas, the blue 100LL, the green 130 octane AV gas run in helicopters.

I've run the green 130 in my SBC without problems cut with 4 parts pump gas.

Airplane engines (even the small ones) have huge valves and the lead is helpful in sealing and cooling and if it’s supercharged, absolutely necessary for the higher pressures developed in those “air cooled” cylinders. I wrecked an air cooled VW engine while experimenting with 100LL. It burned a valve so bad it fell back into the cylinder. It burned because the lead prevented the heat transfer from the valve to the head .

Nope You ever rebuilt any air cooled VWs? I had the misfortune of dating a nice "hippie girl" who had a Bug (1600cc) and a Bus (2000cc). I had to rebuild both of them. Used OEM parts Mahle P/C kits. Heads redone with all new valves/springs/guide/seats. They had hardened valve seats not needing lead and were low compression. Why did you put 100LL in yours? Out of gas near an airport?

Big mess. The other intake valves on that engine were impacted by lead at the seat.

WTF?

I mean almost stuck in the seat.

Stem maybe?
In the seat

With your high octane engine requirement you have few choices but there is one available and as soon as I can remember what’s it’s called I’ll tell you. I used 1 quart to a tank of gas in the summer in my blown Corvette. I’m pretty sure Tolulene is a component. I remember it cost $50 for a 5 gal can. I’ll get back to you.

OMG, are You for real?