Posted by wisbaker on September 30, 2012 at 18:49:36 from (184.108.40.206):
In Reply to: Lead Replacement posted by WI_JJ on September 30, 2012 at 15:36:55:
There have been a few posts about Late 50's to mid 60's IH gas tractors here, it seems in some conditions under heavy load they'll melt pistons and do other bad things. Many discussions have blamed today's ethanol laced fuel, using unleaded alcohol free fuels and even dumping or cutting it with 100LL avgas or racing fuel. Search for the posts and learn some. The old tractors wern't particulary high tech or high performance but it seems under a heavy load the new fuel is rough on them. The newer engines with computer controlled fuel injection adjusted with a feed back loop can tolerate it and richen the fuel mixture up to hold off the detonation but the older stuff can get lean and self destruct before you have time to pull the plug. The lead substitute is not an answer and doesn't help. In my opinion the energy density of the new fuel is a little more varible and the engine can get too lean real quick. The alcohol is an octane enhancer and maybe the remaining petroleum fraction is not as refined or is of a lower quality.
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