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I ran into Ken Andersson from Cosworth this weekend and told him about my ring flutter experience I had on the dyno. As a recap, this happened at 7500 RPM (wide open throttle) and is a harmonic vibration in the rings allowing oil to bypass them into the combustion chamber with the predictable smoke show as a result.
Ken said that this happens with many new Duratecs, even the Atlantic series ones. Most of them stops doing it once they get some wear on them (mine had 10 hours on it when it happened), while a few keep having the issue throughout the life span of the engine. It is apparently a Duratec thing. He told me that in a few of the engines they rebuild they can actually see different zones of wear along the length of the cylinder bore due to prolonged flutter.
Once my race seat is in, I'll up the rev limiter to 7800 and have a friend drive behind me as I do another high rpm test to see if the problem has gone away now that the engine is broken in.
/Magnus F.
Ken said that this happens with many new Duratecs, even the Atlantic series ones. Most of them stops doing it once they get some wear on them (mine had 10 hours on it when it happened), while a few keep having the issue throughout the life span of the engine. It is apparently a Duratec thing. He told me that in a few of the engines they rebuild they can actually see different zones of wear along the length of the cylinder bore due to prolonged flutter.
Once my race seat is in, I'll up the rev limiter to 7800 and have a friend drive behind me as I do another high rpm test to see if the problem has gone away now that the engine is broken in.
/Magnus F.
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