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Speed,Combat,Scale,Racing => F2C CL Team Race => Topic started by: frank mccune on October 13, 2016, 01:43:09 PM
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Hi All:
I was running my MVVS D7 today and the exhaust goo was jet black! I adjusted the needle valve and backed off the compression to where the engine was under compressed and missing. No matter what I tried, the exhaust goo was sill very very black! The engine started very easily and ran flawlessly. Could it be bad fuel? Any suggestions?
Tia,
Frank McCune
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What fuel mix are you using? I know from experience that over compression will cause some black crud to come out, also old kerosene. The kerosene should be clear like tap water.
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If you are using a muffler, a loose one will make lots of black stuff from aluminum wearing.
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If you are using ether from a spray can it has a top cylinder lube in it that burns at a very low temp and comes out black as coal even if your engine is rich and undercompressed with a light load prop. It's not a problem but your engine will coke up a little faster.
MM
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If you are using a muffler, a loose one will make lots of black stuff from aluminum wearing.
A rattling through-bolt in the muffler will do it too. So will one or more loose engine mounting bolts. Black exhaust goo is always alarming, but I hope it turns out to be something simple just vibrating.
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Hi All:
I found the problem and corrected it. The rear of the rod was rubbing on the crank disk. I filed the rear of the rod for adequate clearance. End of problem The engine runs like a Diesel should.
Thanks for all of the help!
Frank Mc cune