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Conversion of C75-12F to C85

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06 Nov 2017 08:27 #1281 by Gordon Bowers
Gordon Bowers replied the topic: Conversion of C75-12F to C85
Larry, do you have a PDF copy of the full text of the O-200 crank,rods,pistons STC? Thanks. Gordon

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11 Jun 2017 08:47 #997 by Larry Snyder
Larry Snyder replied the topic: Conversion of C75-12F to C85
I have a C-85 with the O-200 crank and a 7149 prop. I cruise at 2400 with the throttle back a little. At full throttle I get a little over 2500 rpm. So it sounds that a 7150 might have a little lower top RPM. My static is about 2225. With a light airplane (me and not full fuel) I climb at 1200 fpm on a cool day. Worst case is 300-400 fpm loaded on a hot day. I cruise at 105-110 depending on how heavy we are. If you are flying heavy, you will get nowhere near redline. At least that's my experience.

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30 May 2017 14:23 #973 by Arlan Allen
Arlan Allen replied the topic: Conversion of C75-12F to C85
Have you had the tach checked? I found an error or 75 RPM in my tach. It was reading low ie. 2575 equalled 2500 indicated.

Arlan
N3989H

Alan Allen
N3989H

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30 May 2017 14:14 #972 by Ken Thompson
Ken Thompson replied the topic: Conversion of C75-12F to C85
Bill, you might post your issue on the Yahoo group. This email address is being protected from spambots. You need JavaScript enabled to view it.

It's a very active forum.

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30 May 2017 13:59 #971 by William James
William James replied the topic: Conversion of C75-12F to C85
Ken Thompson

Ken

My concern is not so much related to airspeed . My concern is that the engine is rated at 2575 Max RPM and I can't approach that performance. Never had a plane that required throttle firewalled to get 70% power.

Bill

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30 May 2017 12:58 #970 by Ken Thompson
Ken Thompson replied the topic: Conversion of C75-12F to C85
William, you have a cruise prop. Don't expect it to give you amazing climb out, but you'll pick up a few more mph on cruise than a climb prop would give you. Just may take you a little extra time to get to cruise altitude. If you don't have any obstacles to worry about taking off from your home airport, you'll be fine.

Mine has the 7150 but I have a C85 'stroked' with an 0-200 crank and it climbs very nicely with 400 pounds of people and full fuel.

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