Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Crank Whip

Originally posted by DemonSVT:

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Originally posted by TedS:

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The flip side of straight engines is that a I6 has no really bad harmoinc problems... in other words it is a near perfect setup....

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I'll add to Dan's statement by saying Toyota developed a DMD for the Supra I6 to quell destructive vibrations. Seems the engines were failing on the test stations with only a normal damper.

I'll see if I can find the link to a website with info about it. They even showed graphs (from 3k - 6k IIRC) of how much destructive vibrations (I.E. crank whip) a DMD reduced vs just a normal damper.

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Make sure to look closely at that Y-axis. Not units of life, bearing wear or stress - just db noise. I personally wouldn't present reliabilty data that way, but hey what do I know