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post #1 of Old 11-02-2009 Thread Starter
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Gray Smoke -- under load -- Volvo MD2040

I am noticing a lot of gray smoke in my exhaust when I push it to higher RPMs. What could be the cause? (I don't think it is white smoke, nor black smoke either... seems pretty solidly gray).

I have just changed to larger props (for completely independent reasons)--and the problem got worse. Note, the problem existed before the new props--just not as much. I am replacing the new props with new blades to reduce the pitch a bit, so I can get into my normal WOT range.

The engines have about 2800 hours on them. And have been continually maintained, with oil and filter changes, and fuel filter changes. Etc....

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