After Amy and I got home Travis and I took the airplane out so he could get his first ride in it. During the flight the engine was not running like it should so we cut the flight short and went back to the airport. After pulling the cowling we found a couple of possible causes but nothing that was obviously the culprit. So we went to dinner with Harry and he offered to come over on Sunday (today) and do a little troubleshooting. We started by pulling the fuel servo from his Rocket and putting it on my engine to see if we could replicate the issue. Sure enough, at full throttle the engine started to bog down with mixture full rich. Harry could even see black smoke coming from the exhaust pipes (mixture was too rich). So we decided to pull the mufflers off of the engine and run it that way. Guess what? No black smoke and no bogging down of the engine at full throttle! We then re-installed my fuel servo and tried it again. Same result! So it looks like we have found one more duck to knock off in the never ending journey to airplane nirvana! I have an email in to the guy who built my exhaust to see what he thinks but right now it seems pretty clear that mufflers are not a good option for this airplane.
|Amy at the Friday Harbor Farmers Market...I think there we at least 3 booths!
|Moving this "red cube" fuel flow transducer from the firewall near the exhaust to this location seems to have eliminated most of my idle roughness. Simple fix but so effective...so far anyway.
|This is the bottom of that red cube where the fuel goes from the fuel servo to the flow divider. I am getting a new fuel hose that is a bit shorter since this one is way too long now.
|I took several photo's of the fuel servo replacement project today. This is a picture of the throttle linkage washer configuration so that I would know which washers went where.
|This is a similar picture but this one shows Harry's fuel servo configuration.