My C-90 runs pretty rough. But as has been pointed out, it's not unusual -- annoying yes, unusual no.
I pursued the dynamic balancing idea and was discouraged from doing it by some folks who provide this service. They said that the backing plate behind the M-10 (same as any C-90-16F I think) prop isn't really appropriate for it and that it typically was more worthwhile to do on a larger engines. In their experience, I was going to think it was worth the money if I had it done. They recommended just making sure the prop was balanced -- a small imbalance can create quite a vibration. So that's what I did -- I think the improvement I saw was entirely psychological -- anyway, I THINK it's better now. Dave N9518V -----Original Message----- From: Ed Burkhead <[EMAIL PROTECTED]> To: Coupe-list <[EMAIL PROTECTED]> Date: Tuesday, February 02, 1999 6:23 PM Subject: Re: Vibration >> >From what I can tell, this is perfectly normal for this >> engine. My C-90 does the same thing. The kinda primitive >> engine mounts make it worse. Was the original engine smooth? >> How did you do it? > >Somewhere around 1991-1994, Coupe Capers ran at least one article about >dynamic balancing. In dynamic balancing, the engine is run with >instruments attached, then weights are attached. Much like spin >balancing a tire. It was reputed to give a _much_ better balance and >reduction in vibration. > >At the time several people really swore by it (and I never heard anyone >swear at it). I don't have any direct knowledge of the subject, though, >sorry. > >-- >Ed Burkhead >East Peoria, Ill. >N3802H, 415-D >
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