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Old 10-13-2016, 11:03 AM
Join Date: Aug 2008
Location: blain, PA
Posts: 249
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Default Exhaust is black, black,black...

Hi All:

Today when I started up my MVVS D7 with 9x4 wooden prop. the exhaust was very black! I think that it should be vey light brown at worst. No matter how little compression I used, or how the needle valve was set, the exhaust was very very black. I remember that this is a sign of over compression but that was not the case today. Could it b a fu problem?

The engine started very easily as usual and ran great! Perhaps there is some aluminum, back plate, rubbing somewhere, I think that in a glow engine, black exhaust is usually a sign of aluminum being rubbed of a surface.

Any ideas of what is causing this?.