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John Deere Tractors Discussion Board

Re: lead additive for old engines ??


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Posted by Russ on August 14, 2004 at 05:26:08 from (24.128.229.219):

In Reply to: lead additive for old engines ?? posted by Joe P. on August 13, 2004 at 10:04:48:

Add-a-tive; Adding to your fuel definitely adds to your cost per gallon, don't you think. Does it provide the benefits stated, maybe. The reason for the lead initially in fuel was to increase the rate of heat transfer from the valve face or valve seating area to the mating valve head seating surface. This has always been the thermal mass that took away the greatest amount of internal combution heat. When valve assemblies became better in their ability to withstand thermal extremes and vavle seats went to stellite or other improved heat bearable designs they could endure the EPA requirements of reduced lead or no-lead. The chemistry of additives may not be a solidly proven as UL approved ratings but are available widely for a bit of extra cash.
The high lead fuels have reduced flame front explosions in the combution chamber with the energy delivered a bit more broadly over the small amount of time they have to produce a force applied across the piston face. Since it is slightly cooler in its violent explosive phase it reduces problems of super-heated carbon detonation or pinging. I would go with whatever fuel works for you. Don't make a fuel out me I can do that very well on my own. Gool luck in your carbon based fuel choices.


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