First off, there is no RPM restriction on the C90/McCauley combination. Never was. For that matter, there no longer is a restriction for the C85/McCauley combo, although there was one at one time. It was recinded almost immediately. (Restriction was McCauley SB 12 and it was recinded by SB 13, or something like that.) The C90 was not included because it has a
different crankshaft. Second, if you have a vibration that is sever enough that you're thinking of a yellow arc, you probably ought to figure out why it's doing it. It shouldn't. I have a C90 with 1A90 and I can use any RPM rrom 1800 to 2475. Some are smoother than others, but none are of any concern. (below 1800 I can barely maintain altitude). Patient: Dr. Dr, it hurts when I do this. Dr.: Don't do that. One thing you might want to check is the balance of the generator/alternator. I had a Lycoming that had a sever vibration around 2000 rpm after the prop was replaced. Turned out the replacement prop was junk. You may want to send the prop to a different shop for a second opinion. Bruce of US Propellor of PA. has a lot of experience with props for small Continentals. Good hunting John __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] _________________________________________________________ Enlighten your in-box. http://www.topica.com/t/15
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