C-90 Installation

[Grant S. Bailey]

My 1951 Model 19 restoration is coming along quite nicely. The fuselage is now covered with the base color coat applied. Next is the trim coats.

The airplane originally had a C-85-12F which was completely dismantled when I bought the project. I took the engine to an overhaul shop and they told me both the crank and case are no good. Since then, I have been looking for an engine and have found a very good C-90 firewall forward in a Cessna 140 available for sale and very close to where I live. Can anyone fill me in on whether there would be any problems with the C-90 installation on my C-85 mount? Will it fit in my cowling without any major mods? It currently has a Cessna 150 type exhaust. I have heard that the C-90 is much like the O-200 and would end up 3/4" forward of the C-85?? Why is this? Any guidance or knowledge on this matter would be appreciated as I feel this is a good opportunity. There is no issue with paperwork as the aircraft will be in the owner maintenance category in Canada.

[NY86]

Re: C-90 Installation

Originally posted by Grant S. Bailey
Can anyone fill me in on whether there would be any problems with the C-90 installation on my C-85 mount? Will it fit in my cowling without any major mods? It currently has a Cessna 150 type exhaust. I have heard that the C-90 is much like the O-200 and would end up 3/4" forward of the C-85??

It depends on the "dash" number. If it's the C90-12F I think it is, then externally it is IDENTICAL to the C85. The C90-14 and O200 utilize a different mount bushing, and while it'll bolt right up to the same engine mount, the bushings push the whole assembly forward about 3/8 to 1/2 inch (not 3/4").

Your exhaust and baffels will fit perfectly. You might want a different prop pitch as the T-craft is a little more draggy than the Cessna. the Cessna "standard" prop is a 71-52 and works out well if you cruise at about 115 at 75% What prop are you using with the C85? Figure about 4 more inches of pitch for the C90. If you're planning on using your prop and it isn't a McCauley 1A90 CF71xx or 1B90 CM71xx, you need to make sure it's compatible with the C90 (Check the propellor TCDS)

Anything I missed?

[Grant S. Bailey]

Thanks NY86. While waiting for replies I did a little more research and found as you say that the C-90 case is the same as the C-85 case, so if I buy this engine it should work great. When you say the exhaust will work fine, are you referring to the exhaust system from my old C-85 installation (which is in terrible condition and needs to be completely rebuilt) or the Cessna 150 type exhaust system presently on the C-90 that I intend to buy? I presently have the long mount as my airplane is a Model 19 with electrical system.

As for props, the prop that I have with the C-85 is a 1B90 7150, although I bought the airplane as a project and have never flown it. The prop that is on the C-90 is a 1A90 7146 which might work well as I intend to put the Taylorcraft on floats. Never-the-less, if I buy the C-90, I will own both props.

Thanks again for your response.

[NY86]

Originally posted by Grant S. Bailey
... When you say the exhaust will work fine, are you referring to the exhaust system from my old C-85 installation (which is in terrible condition and needs to be completely rebuilt) or the Cessna 150 type exhaust system presently on the C-90 that I intend to buy?

Well, either one. The Cessna exhaust may not fit the cowl, though, without some modifications. (To the cowl...)

As for props, the prop that I have with the C-85 is a 1B90 7150, although I bought the airplane as a project and have never flown it. The prop that is on the C-90 is a 1A90 7146 which might work well as I intend to put the Taylorcraft on floats. Never-the-less, if I buy the C-90, I will own both props.

that's quite a collection! In the Cessna world, the 7150 would be a climb prop for the C90 or a cruise prop for the C85.The 7146 would be a climb prop for the C85. The climb config would probably work for the seaplane application as well. On the T-craft, the 7150 would likely work well with the C90 and the 7146 with the C85. The C90 would overspeed with the 7146, for sure.

[matsuthunder200]

I had the c-90-8 motor with the cessna 150 exhaust put in my 46 bc12-d.. I had no problems at all we used the same long mount from the 85 . you will haft to modify your cowling for the mufler cans. It is real easy to do you cut a half round hole on each side and use the teardrop covers to cover the holes. You also haft to cut new holes in the bottom of the lower cowling for the pipes. I also used the y pipe and put in duel pa-18 heat boxes. The cabin heat is great the carb heat is also ex..As far as a prop i have a 74-40 sen, for floats it works far better than a 71 and it dosnt over rev. I only get 85 mph out of her but she gets off the water at gross real well.....