Oh boy, you have opened that can of worms again. I think it would be rash to drain what is in there if it is not old gas. I haven't got a clue why people are still using car gas in an efficient plane when the difference has become so much less what with these high gas prices. People will say the 100LL's lead makes their valves stick, but my guess is their ancient junk cylinders were going to stick no matter what, and they blamed the gas. Glen Ward -----Original Message----- From: [EMAIL PROTECTED] <[EMAIL PROTECTED]> To: Couper's Page <[email protected]> Date: Tuesday, May 16, 2000 9:55 PM Subject: [COUPERS] Auto gas
>With the recent postings on using auto gas in your Ercoupe, I've become >a little concerned. So, I stopped by a neighboring airport, whose A&P I >have a lot of confidence in, and posed the question to him. His advise >was don't use it. He said auto fuel was okay years ago when it had lead >and didn't have all the addatives. He pulled out Continental's manual >and showed me what Continental says about car gas: >"USE OF AUTOMOTIVE FUEL IN TCM AIRCRAFT ENGINES" > >TCM does not recommend or authorize the use of automotive fuels in any >of their aircraft engines. The engine warranty and pro rata policy will >be voided if such fuels are utilized. Fuels must conform to ASTM-D910 >or MIL-G5572E, if satisfactory engine service life is anticipated. > >Automotive fuels can contain additives that act as corrosive agents, >formulate gum deposits and, therefore, increase combustion chamber >deposits. Continued operation on automotive fuel can lead to >detonation, pre-ignition and sticking or eroded valves. > >The vapor pressure of automotive fuels exceeds that allowable for >aviation fuels. This increased vapor pressure increases the tendency to >vapor lock at higher altitudes. A vapor lock condition can cause >complete power loss. > >The use of any fuel that not conform to the above specifications may >cause cylinder assembly, valve, piston and/or piston ring >damage/failure. > >The mechanic also mentioned the deterioration of o-rings, gaskets, etc. >He suggested using 100LL and adding either AV Blend or Marvel Mystery >Oil to the fuel. I've only burned about two tanks full of auto gas, so >I guess I'll drain what's in it, fill it with 100LL and add some AV >Blend. Looks like I wasted money on the auto gas STC. He says the >ideal to burn would be 80 octain av gas. > >EBaumgardner N87172. >_________________________________________________________________________ __ _____ >To unsubscribe from this list please send mailto:[EMAIL PROTECTED] >___________________________________________________________ >T O P I C A The Email You Want. http://www.topica.com/t/16 >Newsletters, Tips and Discussions on Your Favorite Topics > __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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