Did you ask the A&P how happy TCM is about burning fuel that has 4 times the lead content of what the original spec was?
----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Couper's Page" <[email protected]> Sent: Tuesday, May 16, 2000 8:41 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
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