----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- TBO on the C-85 engine is a meaningless term at this time, as far as you are concerned. Only Commercial operators have to comply with the requirements of the TBO value which is established by the manufacturer based on a measurements provided by the marketing department. This is just as well because while the C-85 engine is rated at 1800 hours, based on several hundred hours of use each year. In general, most engines have about a seven year TBO which would be 350 hours the way most of us fly.
The bottom end components of the small Continental engines are generally very good and should make 1800 hours and more with only a regular oil change. The cylinders on the other hand, seldom make TBO without attention unless they are installed in a pipeline patrol plane which spends its' entire life at 60% power. The best thing that you can do for your cylinders is to pay attention to the baffling around the fins and heads. I would like to take a quick, informal poll of the members of this group. The #4 (pilot side, front) cylinder on my engine has lower compression because of leakage at the exhaust valve. The cylinder is a Millennium with less than 100 hours. What I am interested in is whether others have had trouble with the #4 cylinder. In 600 hours, I will have had to have work done on the # 4 cylinder three times because of leakage at the exhaust valve. My suspicion is that the exhaust valve area of the head receives too much air flow and too little cooling. It would also be subject to the greatest change in temperature with changes in power and speed. The C-150 has some baffling in this area to limit the blast of air that hits this cylinder and I suspect that the Coupe may need some similar baffling. Good luck with your engine, Bob Condon --------------------------------- to unsubscribe 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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