David, I had a similar experience with my Alon and its C-90-16F. It seemed 'shakey' below about 2250 rpm so I had the prop rebuilt as a sort of insurance policy. The difference may not have been great but it made me feel better. David Cross N5600F
---"David M. Perozek" <[EMAIL PROTECTED]> wrote: > > 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 > > > > _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com
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