That's because you don't have a constant-speed prop where the oil at the end of the crank is circulated...any dead end in the oil system will accumulate sludge.

The auto fuel STC is invalid in areas where they have the slightest amount of alcohol which is pretty near everywhere so those folks are stuck with 100LL. TCP is a good lead scavenger for low-compression 100LL users.

It could also have been bearing babbit material as the engine had 2200 original hours and when I overhauled it the crank bearings were down to copper inside and out. Plum wore out. Oil analysis says it is doing good now.

I put 100LL in every now and then as it helps the valve seats by putting some kind of coating on them.

When most airfeilds stop offering 80/85 ave gas for sale a lot of the local guys that could use it would buy several 55 gallon barrels and then go fill them up at a local gas station with ump regular and transfer that it into thier airplanes. I had heard some of them comment later when thier airpalnes sat for more then 5 or 6 weeks (at L 26 in Hesperia, CA in the Mojave Desert) the motors where really hard to start, hence my question on how hard was yours to start on pump gas after it had sat for awhile My Comanche sat in the hangar in Hesperia for almost a year before I flew up here to Bend, it was a lot harder to start at that time than when I flew it once a month minimum It had a single primer nozzle into one cylinder so it did not prime all six cylinders, once it was warmed up I could start it off the throttle very easily I would shut the motor down with the mixtue control so all the cylinders where dry when the motor quit and no residual fuel in the intake manifold.

Bottom line for me is - I would not use Av gas on a street car. Race possibly. Than again, I would not build a street car that won't run on street (pump) gas. Other reasons = if it's got lead in it, it's illegal, They ( the airport by me ) won't sell it to me, and it costs 3 times as much as pump gas. Wooops, almost forgot, vapor lock is not my friend - kind of a moot point after the other reasons. Yes, I have tried using it in the past ( way past when it was not against the law to use it on the street and easy to buy ). Then again, you could buy Sunoco 260 for a 1/4 of the price back then also and totally avoid any vapor lock issues.

One thing people are forgetting, the piston acceleration and speed of an airplane engine doing 2700 RPM is like a small block doing 9K plus rpms, I read the math once on piston acceleration and speed, the huge radials had massive piston speeds, as much as a small block mopar that is maxed out. They also run at a much higher loading, my airplane usually runs at 80-90% power in cruise...a car on the street is maybe 35%...its all in the BTUs when it comes to engine load. Tim

Interesting listening to the experienced pilots, I'm a new pilot myself with 100 hours now in 180 HP C172.
The 100LL at my airport is $6.84 a gallon and Sunoco 110 leaded is $7.45 gallon here and a lot easier to buy. So not a huge difference in price here.

My class delta home airport is a busy place right here in town so the price of fuel is higher than at the rural airports I noticed.
I fly at least once a week sometimes twice a week renting my flight school planes, they have 3 that I can rent. These are the 3 I fly.

I can buy 100 LL for $3.95 a gallon and I only have to drive 8 mi to get it,no brainier on my end as far as I'm concerned.

This is my situation also............

I pay $3.70 for 100LL. While we are showing planes here's my junk. When the cars are not fast enough this will fly 200mph all day long....

My wife flys these when she is bored LOL

I can't even sell 100LL to the general public , unless your flying in with wings attached

And we are pumping a 1,000 gallons a day of 100LL right now with the EAA down the road from where I work in Green Bay

Line Manager Executive Air

Wow that's awesome!

I only have 800 hours flying in Alaska, and 1500 total, never wrecked up there, which is not the norm, but for gas, I would put in whatever I could find sometimes...remote strips don't always have 100LL

awesome!!

Awesome as well, 2 fine pieces of machinery. Very cool!! I dream of the day I can take the same picture!

Speaking of 200 mph...I used to race top alcohol dragster for 9 years and have been 264 mph on the ground many times and even faster when I drove it out the backdoor like a dumbazz.
But I have to say that learning to fly was not easy for me, tons to learn forever. Hopefully it will help keep my mind sharp as I plan to continue my flight training for as long as I can.
Instruments next.

Is that a A35 or a A36? If either I wasn't aware they would break 200 MPH or 200 KPH in straight and level flying

its a f33. not exactly 200 mph,195 or so, close enough. it does 168 knots at 7000 ft. Comanche guys have always been jealous of the bonanzas speed, Ha Ha

Well, if you like 100LL, start looking for a replacement. 2018 is to be the last year for leaded av gas. Two companies are in the running to get EPA approval.

I think I just may stay w/VP-101 since I`m possibly moving to AZ fairly soon and not sure of av gas in that town..........

its not going to happen no where near that fast..... and when it does they will have a 100 octane unleaded aviation fuel substitute. There are thousands and thousands of certified aircraft that require 100 octane fuel. They still make them new today. The government cannot and will not abandon them.

My brother in law had a Bonanzas... did they make a
pressurized version ... was fun.. he would let me
do the take offs .. never did a landing... use to
fly in that a lot... he had the contract for building
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