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lead or no lead ?

Please do a search. This topic as been beat to death every one to three weeks since Kim started this site.
Unless your AC is powered by an aircooled Pratt & Whitney radial engine. And takeoffs are regularly made from floats at max payload. Your AC needs lead as much as you do.
 
Hi Buickanddeere: You wrote: "And takeoffs are regularly made from floats at max payload" I'll add "and there is no chop on the water to help break the floats loose and no head wind" There, that has most of the power needs to consider. Your example is right on... ( as usual.. ) I always enjoyed seeing and hearing a radial. I saw a "tractor" of sorts in 2009 that had a radial engine and when I find that picture, I will post it. I seem to remember the radial was used for its better power to weight ratio.. ag.
 
So-called "lead additives" do not contain lead. The only place you can buy tetraethyl lead is at the 100LL pump at your local airport.

Although aircraft engines still run leaded gas, it's just a matter of time before it is phased out for avgas as well.
 
We usually have a moose in the plane too,overloaded with the tail a little heavy.
Works better with the PT-6 cranked to max torque rating than the P&W 1340 in the Otter.
Makes an oily mess on the windshield when a cylinder head departs on it's own flight during takeoff.
 
The old car guys have pretty much decided not to worry about it. Unleaded may or may not be a problem for the valve seats- if not, there was nothing to worry about; if so, put in hardened seats when you grind the valves, problem solved.
 
CR, why would you do that? Unless you've bumped up the compression ratio on your hog to the point it knocks on unleaded premium, there's no reason to run avgas in it. Stock Harleys have fairly low compression ratios.
 
It had some bad gas in it so to compensate for the crappy stuff I put the Av.gas in kind of an experiment too I dont run it all of the time,too costly and no real need but i did notice a difference,I have found that different kinds of gas will run different the reformulated gas that they sell around Milwaukee runs poorly and the ten per cent ethanol blends dont appear to work as well either I try to run the 93 octane or thereabouts
 
100LL avgas actually is a minimum of 99.5 octane rating. 6 points higher than standard auto high test of 93 octane. i run 93 octane in my oliver 1750 gas motor , it requires min 91 octane fuel, plus a bit of marvelos oil, because of the ethanol in fuel today tends to dry out rubber parts in carbs. Theres lead in LL avgas, about half as much as standard 100 avgas. Depends on what P&W engine your using. 985's get away 100LL if you don't pull to high a manifold vaccuum for too long.
 
I was thinking price is similar between 94 road gasoline and 100LL at the airport.

As of Jan 2010, 100LL has a TEL content of 1.2 to 2 grams TEL[6] per US gallon (0.3–0.5 g/l) and is the most commonly available and used aviation gasoline. One gram of TEL contains only 3/5 of a gram of lead.

100/130
Dyed green, avgas 100/130 had a higher octane grade aviation gasoline, containing a maximum of 4 grams of lead per US gallon (1.1 g/l). 100LL "low lead" has replaced avgas 100/130 in most places, but Avgas 100/130 is still sold in Australia and New Zealand as one of the two manufacturers in Australia is unable to make Avgas 100LL.[citation needed] Currently commonly called AVGAS 100.
 
price wise, not sure how they compare, haven't been to an airport and bought any in a few years. I don't know that av gas prices rose a lot back in late 80's early 90's. Yet auto gas has skyrocket in comparison to av bas over the years. Lot of people were doing the stc thing, getting a piece of paper saying it was ok to use auto gas in thier airplanes. personally, i think that was a joke. Auto gas just doesn't have the properties needed for higher ltitude flying, vapor locks too much, and just plain wouldn't vaporize well. i was always asked by owners to go for flight in auto fueled planes... I politely said thanks, no thanks i had things to do. Always asked by them to fix problems with engines not running well on auto gas. I said easy enough to fix, run avgas.
 
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