mvvette97

Mixing it 50/50 with normal gas. I have no cats so them plugging is no concern. This stuff won't hurt my engine will it?

SLPRC5

Hey Marc,

I remember we use to run 115/145 av gas and some guys burn pistons and valves using it w/o mixing or running it for too long.

tiojames

We used to run it, but that was back in the 50's and 60's with 13-1 street engines. I am pretty sure the additives are different now. Hopefully some one who is up on av gas will chime in.

mvvette97

Wonder why that would be? He has ran it in his cars and bikes for years and had no problems

mvvette97

Yea I used to hear bad things about it. I heard that is would burn very dry but he said it has more lubrication than pump gas. I have never used it but he has used it in about everything he has. He is a pilot and his own mechanic. I put some in my trans am just to see how it will run but I haven't drove it yet. It sure does smell good

94legaleagle

I think this has been discussed before, but might have been a year or so ago - and I don't remember if the discussion was about running straight av gas, or mixing av gas w/ regular pump gas

But I seem to remember that av gas is drier than normal pump gas, and it was suggested that av gas would wreck some of the seals, etc in the C5's - so advice was NOT to use it.

sxeC7

Avgas now days is 100 Low Lead. It would help if you're having a ping or knock problem from high compression or you're tuned for more advance.

Old 115/145 Avgas, if not mixed with Amoco or another unleaded fuel, could burn valves at high rpms because it reduced the fuel burn rate to the point that it was still burning as it was exhausted. Fine for low rpm aircraft engines, but not cars.

T VETTE

I think the issue back when I ran AV gas in the 70's was there was no lead in it. Cars now have hardend seats so not really an issue. Could also be other things involved but not sure.

SLPRC5

It burned real hot..tail pipes would be white as snow..as mentioned, times have changed with the additives...50/50 was the best mix back in the 60s and 70s in stock cars..I had a '61 351 Ford back then and burned it a couple of times..and it made the car really run great. Some of the guys on base with performance cars had engine damage with a stronger mix.

mvvette97

Thanks guys. I put some in my trans am but I have it mixed. I'm not planning on using it much. This was the first time just to see how it would run. I buy it mostly for my Suzuki Quadracer. I can't run pump in it and the plane fuel really makes the ping stop. I just got curious with it on how it would run in cars.

b98

Go for it.

mvvette97

haha. The vette doesn't need it since it's mostly all stock and i don't think the trans am will get anymore of it either. The quadracer loves it though.

ztheusa

There has always been lead in avgas. Some more than others, but all contained it, including 80 and 80/87.

Karl

NOS500

I buy it for all my Dirtbikes and four wheelers (my other hobby), but I wont be putting it my car

midnightc5

Av gas claims to be low lead, but actually has quite a bit of lead
content. You got rid of your cats so that is not a concern but
it will mess up your o2 sensors over time. Being an aircraft mechanic
and into performance cars, I inquired long ago. Great for off road toys
tough!

NOS500

Zo6Killa

I usually run Traxxas Top fuel 20% nitro (the hobby r/c gas) in my car at the track. I usually mix 60% normal gas and 40% nitro. They improved my 1/4 mile times by roughly 4-5 tenths

Car has 110k miles going on strong

mvvette97

well that would suck if it messed up the O2s. Oh well, I wouldn't think it would hurt too much just this time.

Blue Lightening

If I were you I would consider adding Meth injection instead of running 100LL Av fuel.

VetteDrmr

Can't believe no one has said this before me, but:

100LL has a huge amount of lead in it, about 20 times more than the old 87 leaded autogas. This lead will do more than kill your catalytic converter, it will also plate into the valve seats, combustion chambers, and valve guides, causing sticking and hot spots in the heads.

The white deposits you see on the tail pipe have ZERO to do with temperature, those are the lead deposits.

Bottom line: bump the octane rating as needed using unleaded additives such as Torco.

HTH, and have a good one,
Mike