Actually 25-30% 100LL should give you enough lead for valves, but that is only a temporary solution as 100LL is being phased out or getting increasingly difficult to get. The FAA has approved STC's to allow most general aviation aircraft to run on Autogas. I question some of the valve seat recession wisdom. John Deere offered propane 1010s did they have hardened valve seats 'cause propane has squat for lead, what about all the old distillate engines-did tractor fuel or distillate or TVO have lead? Last month there was a big discussion about modern fuels causing problems with red tractors with six cylinder engines, work 'em hard on autogas and they melt pistons. I've seen air-cooled engines (VWs and some Kohlers) having fuel related issues that caused exhaust valve failure, the seats were fine but got some stretch on the exhaust valves. This was when leaded gas was still available, a root cause was the engine running a little to lean. Back in the air-cooled VW's heyday a common cause of death was breaking #3 exhaust valve, the valve would stretch a bit, where the stem got thin it would break and the the valve head would bounce around in the cylinder spreading hate and discontent. It was always #3 because it was tucked in behind the oil cooler and ran a little hotter than the other cylinders so when you pushed it out to the edge #3 gave up first. If you were "lucky" some times you'd loose a small enough section on the valve face to not screw up to much before you got it shut down.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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