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Thanks to all of you who replied to my request for help on my coupe. The problem was I was losing power in cruise. Pulling on the carb heat would return power. I ruled out carb ice as it gave no warning. I removed the carb and the carb heat box. The shaft bushing had come unwelded. After repair and great hopes, the problem remained the same. Next, I cleaned and checked the Stomberg carb. All looked well. Having done mechanical things all my life, I studied the problem and then decided the engine was running too lean. I removed the main jet (number 45) and, using a jewellers' file, enlarged the jet about .002 inch. After assembly I did lengthy ground tests and all seemed well. The only noticeable difference was that now it ran a little richer and the lean mixture made very little difference compared to previously. Now after numerous flights the problem appears to be solved. It has not skipped a beat. The first Ercoupe I owned suffered from the same problem only worse. The carb jet upsizing also repaired that plane. Many Ercoupes appear to suffer a similar problem, usually put down to carb ice, which can be a problem. My theory is this: the air intake is funnel-shaped and forces air in the intake, from 7 inches in diameter down to about 2 inches. This tends to ram air into the carb in flight. Also, as the intake narrows, the air speeds up and causes cooling. The main jet that can handle the incoming air on the ground is not big enough to supply enough fuel for the extra air being rammed in at 100 MPH. I know that fiddling with jets is considered risky and not the thing to do, but it does work! If others out there are having similiar loss of power, I cannot recommend that you do what I did, but it worked for me. If you do any work on your main jet, be VERY careful to enlarge the jet no more than about .002 inch. Any extra fuel consumption is insignificant compared to the necessity of keeping the windmill turning. Without that noise up front, the Ercoupe tends to glide through the air as lightly as a grand piano. Well, good luck, and I'd like to hear any comments on my solutions to my problem. regards Jon Page BC Canada --------------------------------- 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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