Posted by buickanddeere on May 13, 2016 at 06:52:15 from (184.151.37.77):
In Reply to: 100LL Avgas posted by Eric in IL on May 12, 2016 at 07:18:01:
Quoting Removed, click Modern View to see
Wrong, that is an old wive's tale.
100LL has a maximum of 0.56g per Liter which is just enough to protect the exhaust valves of P&W and Franklin air cooled aviation engines .
Today if you can find a batch of 115/145 purple. Even it has been reduced to a max of 1.29g per Liter.
There was more lead in the bad old days of purple 115/145 from WWII until the 1980's.
As other posters have already noted . 100LL will readily turn to vapour in the carb/intake/combustion chamber for easy starting. However it's less prone to vapour locking in fuel lines.
100LL does not deteriate into gum, goo and varnish that attacks fuel system components.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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