Engine basics > Engine set up tips
Need a spot of help please.
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Bob Johnson:
I had a strange thing happen to me while flying in Peoria. On my second round flight things were going along just fine until the overhead eights. Suddenly the motor sagged/went rich, I nearly lost the plane but managed to save it by the skin of my teeth. The rich run continued till the lean out at the end of the tank. I'm running an OS 20fp in the BBTU set up. This has been a consistant and problem free performer. The practice an first round flights were trouble free. The only change I made was to use one eighth ounce less fuel to shorten the flight a bit. I have not had it back in the air yet, but have looked it over and can find no problems. I can think of a lot of things that would make it go lean, but not rich. The fuel I'm using is a 50/50 blend of Sig 5%-25 all castor and 10%Tower power(I know, but it's worked well all season so far) Any ideas of whats going on? I'll post a photo of the set up, the only change from the photo is the addition of a check valve between the muffler and tank. Thank you in advance for your help.
Bob
Tom Perry:
Although it seems unlikely, I'd change the glo-plug before trying anything else. #^
RandySmith:
HI Bob
As stated change the glo plug, and be aware after cranking if the engine sags a little when you remove the battery. This can indicate a plug going bad, or a plug that is too cold for the motor . Also you would want to clean the filter spray bar and NVA assembly.
Randy
L0U CRANE:
A few other thoughts:
Check to make sure the intake filter is clear and clean...
The check valve only admits pressure to the tank, I'd guess. An open line from muffler to tank doesn't *hold* pressure. If the engine spins up a bit high, and some excess pressure goes to the tank, a check valve would prevent it from venting back through the muffler.
(Seems that should only be a temporary thing, tho, doesn't it?)
Be interested to hear what does the trick for you.
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