C-85-12

[Armstrong]

I found a C-85 for sale and I am thinking about buying it. Does it make big difference in performance? I dont really care about speed, but does it make a big difference in climb?
Its a C-85-12 TT- 1718 and all acces. Its dissasembled and all the parts are in cosmoline. I saw yellow tags( El Reno) on the case , rods and cam, but the cylinders are all junk,( they were not cosmolined) full of deep pitting and there allready ground .015. Crank is red tagged, its been ground too and one main journal is scored too deep. He wants a $1ooo.
Would it be woth buying it and installing 0200 crank?
For an extra $500 he has a A-65 with all acces, no logs, but a yellow tagged( El Reno) crank ,case, cylinders, red tagged rods and cam. I know thats a good deal! Rob

[Acroeric]

Re: C-85-12

It sounds like a pretty good deal but just remember- these are getting pretty expensive to overhaul. If there are alot of missing parts you may very well be better off buying one for a little more money just to make sure everything is there. I would compare it to buying an incomplete taylorcraft project and having to piece meal the rest together- it is always more than just buying one that is all together.

As for the performance- if you have a C85-12F powered non electric Tcraft (ie short mount 800 pound or less) there is alot of difference in performance- mainly in load carrying ability and climb. If you add all the electrical stuff it becomes almost a wash.

[paulp]

Re: C-85-12

Howdy Armstrong,

I did the conv. to a mod 19. I also did the 0200 STC stroker kit conversion to the 85-12. The climb performance is ok(500 fpm on a a 90 deg day) cruise is about 105 @ 2350 rpm. You will probably find that cranks for an 85 are expensive and hard to come by hence the reason for the 0200 STC. I would recommend buying a complete engine because if you don't, you will spend a lot of time chasing parts. Good luck

[Armstrong]

Re: C-85-12

Thanks for the replies, I called and told him I would buy them.
I figure I can sell all the A-65 yellow tagged parts to offset the cost of an 0200 crank and I dont mind getting new cylinders( I probably would anyway, even if the old ones were usable). The C-85 crank only has one bad journal, can those be built up and ground or not? I want no electrics. Can I legally install the C-85 with the 0200 crank and no electrics?

Paulp, where can I get info on the conversion you did? Thanks,Rob

[Armstrong]

Re: C-85-12

I read the thread on converting to C-85/ 0200.
I see that there are alot of gray areas, and it really depends on who you work with in FAA, and what that person is willing to sign off.

[crispy critter]

Re: C-85-12

Rob,
I got a field approval to put an 0200 on Crispy Critter without electrics,It took some work but I can send you a copy if you wamt me to.

[Armstrong]

Re: C-85-12

Thanks kevin, that would be great. So yours is a non electric C-85 with a one time approval and then the 0200 parts added? Did you buy an STC for the conversion from 85 -0200? Should I PM you my E-mail?
Rob

[paulp]

Re: C-85-12

Rob,
The STC for the 0200 crank and rod installation is available from several sources. I got mine from Superior in Tulsa, OK. You probably need to check to see if the STC covers 85-8's(non elect) if it doesn't, you can still use an 85-12 and put a cover plate over the starter and gen. openings in assc. case.

Rebuilding the crank is probably a no-no. There is an stc for turning the crank to .020 under but I would look for another crank.

The best solution from both a time and money standpoint is to locate an 85-8 that is complete and rebuild that. Then, you will know exactly what you have.

Good luck

[WLT]

Re: C-85-12

A set of cases for $1K?

[N96337]

Re: C-85-12

I've got a good C85-12F crank.... not going to be used.
JH

[Armstrong]

Re: C-85-12

I've got a good C85-12F crank.... not going to be used.

JH

N96337, Thanks for the offer, I am still deciding what to do. I want to put an 0200 crank in it, but may sell all the parts and look for a complete running C-85-8 as was suggested.
I know you guys are probably getting sick of answering these Engine/STC questions over and over. I have been doing searches and reading the threads here, but there seems to be alot of gray areas about what you can and cant do. I really appreciate the help. Somone needs to put out a book, "So you want to install a C-85/0200 in your T-craft",I would buy it!

I picked up the parts today and they look good , no corrosion.( except for the 85 cylinders)I got a little bonus, there was a set of C-3 tail surfaces he let me have( in very good condition). I did not know what I would do with them except to trade or sell them,but when I got home I found a set of engine and airframe logs and data plate for it in one of the boxes.How much of the airplane do you need to rebuild it as an original