However, the power which is lost is barely noticeable under routine operations. Baffling is usually determined by the airframe manufacturer. Continental supplied engines, but no baffling, although they provided the airframe manufacturer with guidance on cooling. The fix, of course, will require pulling the cylinder to inspect. A final, but probably remote possibility is that a valve guide is leaking. If the guide leaks, then oil is pulled into the combustion chamber when the valve is open on the intake stroke.
You might be able to do the work, but a licensed FAA mechanic with Inspection Authorization is going to have to approve the installation. I don’t think that you will need an STC, but the installation will have to be done in accordance to some configuration found in the Aeronca Type Certificate Data Sheet. The National Aeronca Association or the Fearless Aeronca Aviators can help with the install data. Contact Aircraft Specialties at , or find more contacts at -specialties.com. The last time I bought a set of .020 bearings the price was about US$350.
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Other than some oil residue coating the lower plugs, I could not find any lead fouling at the cleaning. Your C85 might have been salvaged from an Ercoupe, and the fuel pump kind of came along fro the ride. I fly a Cassutt which does not have a fuel pump and the head pressure is likely less and the demand greater than your SE-5A. Typically, as long as there is a foot or so drop from the tank to the carb, a fuel pump should not be required.
- These bolts don’t rely on a a specific torque but the overall length is measured.
- However, this process can be accomplished with the case mounted, just be very careful.
- If the timing has to stay at 24 we can live with the current cylinders until we see further deterioration in the rings and valves.
- Finally, it could be that you got a bad set of rings.
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