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Conversion of C75-12F to C85

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28 May 2017 09:58 #967 by William James
William James replied the topic: Conversion of C75-12F to C85
Larry, what do you mean "get the prop cut and re pitched ? mine is 7150 . . . .

Bill James

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28 May 2017 09:56 #966 by William James
William James replied the topic: low RPM at cruise on C-85 engine
Larry etal

I have been trying to get a handle on a problem with my 415-C with the Cont 85-12 engine. This engine even has a Continental metal tag on the engine showing it to be 85HP and 2575 max RPM . . . I have a new McCauley 1290/CM7150 prop, overhauled carb to make adjustment to the C-85 . . . I can get about 2200 static RPM , but in flight I can get only about 2350 to 2400 RPM at full throttle I generally must fly with FULL THROTTLE to get 2350 to 2400 RPM.I have the "long pull" mixture control so I can achieve lean operation burning about 5.6 GPH @2350 RPM. The engine compression are all mid 70's or better . I have had several club responses but none have hit the mark. I have had the induction system completely examined . . new plugs , harness checked. .Take-off and climb is anemic. The plane is great except for this problem . I have 2 15 gal wing tanks and NO header tank.
SURE COULD USE SOME FRESH IDEAS !!!

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22 May 2017 18:49 #955 by Larry Snyder
Larry Snyder replied the topic: Conversion of C75-12F to C85
My plane had a C75 when I bought it. After two years I rebuilt the engine and made a C85. I also put in the O200 crank STC. I cannot tell you how much better the airplane flies. I remember taking off with the 75 and the 2275 redline sounded like it was barely better then idle! At least the 2575 of the 85 sounded like an engine that actually generating power. I'm not sure you could load my plane with enough weight to keep it from I'm flying! Just remember, you'll need a new prop or get your old one cut and re pitched.
The following user(s) said Thank You: George Sellers

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27 Apr 2017 13:46 #909 by George Sellers
George Sellers replied the topic: Conversion of C75-12F to C85
Thanks!!

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20 Apr 2017 20:47 #895 by Arlan Allen
Arlan Allen replied the topic: Conversion of C75-12F to C85
I stand corrected the TCDS is the standard. The knowledge base here is so impressive. I always enjoy the read. I always learn something new. When I started flying over 50 years ago an IP told me: "The day you don't learn something, is the day you should quit flying!". Thank you for the info.

Arlan
N3989H

Alan Allen
N3989H

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19 Apr 2017 19:17 #889 by Kevin Gassert
Kevin Gassert replied the topic: Conversion of C75-12F to C85
The part numbers are 40487L, 40487R and 40488 and yes these are applicable to all C85 engines but not required on all C85 engines. The parts book is a list of applicable parts not a list of required equipment. The TSDS is and it only requires those baffles with the Beech prop.

Kevin

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