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Re: E 85 thingy
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Posted by MarkB_MI on July 15, 2006 at 06:44:34 from (64.31.11.245):
In Reply to: E 85 thingy posted by Delbert on July 15, 2006 at 05:47:33:
Most older engines (30's through 60's) were designed with the assumption that they would be using leaded fuel for valve seat lubrication. The later engines have hardened seats that don't require lead. There are several reasons that we didn't see a lot of problems after the switch to unleaded fuel. The main one is that most of the older engines didn't see a lot of use after the switch. You could still get regular leaded gas until around 1990; by this time almost of the leaded fuel engines were over 20 years old. Another reason we didn't see problems after switching to unleaded fuel is that an engine only needs a few hours of operation to get a "lifetime" lead treatment. Today, aircraft engine manufacturers recommend that you operate the first 10-20 hours on leaded fuel, even if you intend to operate on unleaded fuel ("mogas", as flyers call it). The fact is, it is nearly impossible to buy fuel today that doesn't have some ethanol in it. Of course, the higher the ethanol content the greater the risk you'll have problems with fuel system components; the choice is up to you. Ethanol content in auto fuel is a big problem for aircraft that run mogas. These planes need a fuel (80/87 avgas) that is no longer available, so they run unleaded instead. Aviation organizations are actively lobbying against state laws requiring the use of ethanol in mogas.
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