A friend I met at the local College is now an airplane mechanic and sez I can buy all of the 100ll I want legally at $3.85-$4.00 per gallon instead of the $8.79 VP-101 so time to check it out. I know leaded can tolerate more timing but is there anything else I need to know?.............Thankxxx............

100 low Lead Avaition has lead in it, the Federal Goverment fine for running leaded gas on the streets is $10,00.00 for each conviction Lots of the local street racers up here run it, none of them have been busted, YET I use to use it in my old bracket cars and NHRA stocker until I saw that it was eating up the valve seats It has a brake specific of .690 usually which means it will run real lean in most carbs without jetting or tuning
BTW, more than one VTVL street guys made comments on my old street cars when I ran that fuel on the streets down there, they could smell it

What's the difference between our seats and airplane seats........

I really have no idea on the seat materials other than most airplane motors are air cooled and run under 2700 RPM The sleeves are steel and the block and heads are aluminum I had one exhaust valve spit a pie shape chunk out of my airplane motor at 8500 ft at 190 MPH about 50 miles east of Needles, CA, that made me turn around and go back to the Prescott, AZ airport real quickly. I had been running that mixtured at +25F rich of peak on the single probe EGT up to then, I ran it +75 F after that

Well it SEEMED like a good idea............

Reeds vapor pressure is the first thing that comes to my mind with AV gas. Discluding octane and lead issues, the stuff is ment to be run at altitude, not sea level. Airplane engines and what we race are very different in design. They run valve seats 2-3 times as wide as we do with spring pressures well under what we run.

could one pick up a couple of points of octane with a 50/50 mix of avgas and 93 E10 and solve both the vapor lock issue with the pump stuff and the vaporization pressure issue with the avgas?

Here we go.....

The one really good thing about avaition 100LL is it has a shelf life of 18 months, it is what I try to use in my stuff that sits a lot between uses, pit bike, generator, lawnmower and so on
The local pump swill has a shelf life of less than 90 days

I guess airplanes dont take off at sea level. This is where they need the power.

Dom,

go over on YB, there is a long thread about it over there. Nothing wrong with it other
than you need to jet up a little.

Bing-go.... yes guys run it on the street but usually
with lower compression thinking its better... hard seats
can use the no lead... if you need lead... you better add it

Take off at sea level is no big deal in many piston powered airplanes, taking off at Denver in the summer in the middle of the day is a little more challenging You have to lean the motor out for best power on the run up and know that the airplane will take around another 1500 to 3000 ft more on the take off roll to get airborne and then fly like a lame slug in that air density, keep the nose down and get some speed up before manuevering I flew into and out of Denver once, I told the passengers to be ready for takeoff before 9:00 AM, which they where The air density was still way above 10,000 at that time
That engine was a 540 C.I. Lycoming opposed six cyliner rated at 260HP at sea level., it had around 170 HP max at that airport that day in that weather leaned out

Ever notice someone who posts a lot says nothing worth reading with a lot of emotions?

I have ran it on pretty much anything you can think of, no issues, Blowers,turbos and compressions up to 12.5-1

Who might that be...........

low lead will still kill an o2 sensor.

Never used it. I'm not a chemist, I figure I have a gasoline engine, it runs 9.50 on pump gas, I drive it to work sometimes. It's not an airplane.

I'm still on the same 02 from 6+ years ago and it`s fine............

That might be, but O2 sensors were never designed to run with leaded fuels. The chances of fouling a sensor are pretty high on a street motor that might idle around a lot more than a race engine at temp.