Exhaust for C 85 on a BC12D

[Craig]

I need to replace the exhaust on my aircraft.

When I queried Univair for price and availablity I received this response.

Craig,

The exhaust we make is only approved for the 65hp continentals for the b- bc12d aircraft. Im not sure if this would fit on your engine. Being its a one piece exhaust I don't know if the cut outs would be in the same place. I know for our j3 exhaust to get them to fit on a 85 they have to add some material to the stacks to make them a bit longer so they can reach the muffler..

I hope this info helps, you might see if anyone have installed these on a c85.

Best Regards
Jason
Univair Aircraft Corporation.

Have any of you installed this exhaust on a C 85?

Other than Univair and Aircraft Spruce is there anywhere else that sells an exhaust for a T Craft?

Thanks in advance for your reply

Craig

[Robert Lees]

Re: Exhaust for C 85 on a BC12D

To make it fit you have to cut it along the "back straight" and weld in a piece. It's best to do this when the engine is off the airframe to guarantee it fits.

[Dano"T"]

Re: Exhaust for C 85 on a BC12D

I thought a C85-8 used the same exhaust as the A65....Hmmm, That's what I thought anyways.

[jim cooper]

Re: Exhaust for C 85 on a BC12D

How about a luscombe exhaust? JC

[N96337]

Re: Exhaust for C 85 on a BC12D

What Jim says, or even Cessna 150 exhaust. Anything is better than the one piece!
John

[flyguy]

Re: Exhaust for C 85 on a BC12D

Definitely Luscombe "silver" coated exhaust. There is a thread talking about them here. On thread I think there is a link to making a replacement for the carb heat exchanger. The "factory" one is expensive; as I remember, that was one problem. I have the right side Luscombe exhaust only on my -85, works fine, last a long time. Look all over for prices as I think there is enough difference to make it worth while.

Want a photo of my right side one?

Same info with more discussion: see similar thread list below, first item.

OK, checked for you. Wag Aero July 2011 catalog, pg 54, set, both sides $429. "For continental engines." Aircraft spruce, a little over $600 for both.

Darryl

[astjp2]

Re: Exhaust for C 85 on a BC12D

I just installed a set of the luscombe pipes for a customer, easy as pie, the hardest thing is removing the old exhaust. Still need to find affordable shrouds. Terry's STC is slick to do. Tim

[barnstmr]

Re: Exhaust for C 85 on a BC12D

To make it fit you have to cut it along the "back straight" and weld in a piece. It's best to do this when the engine is off the airframe to guarantee it fits.

I disagree... If you compare the measurements of the exhaust ports on an A65 vs. a C85 in their respective continental service manuals, you will see that they are identical by design. If you have any differences it could be due to non-standard differences... such as reduced crankcase deck height, PMA cylinders, or some other discrepancy.

[flyguy]

Re: Exhaust for C 85 on a BC12D

I'm coming out of left field on this, but is Rob possibly talking about adapting the "crossover" version of the Luscombe exhaust and not the dual divided pipes?
DC

[astjp2]

Re: Exhaust for C 85 on a BC12D

The 85 is wider....

[Robert Lees]

Re: Exhaust for C 85 on a BC12D

I disagree... If you compare the measurements of the exhaust ports on an A65 vs. a C85 in their respective continental service manuals, you will see that they are identical by design. If you have any differences it could be due to non-standard differences... such as reduced crankcase deck height, PMA cylinders, or some other discrepancy.

I can only relate to my experiences, and twice I've had to extend the "back straight" (parallel with the firewall) on conversions from and to normal unmodified crank cases and Continental OEM cyliners.

YMMV.

[Craig]

Re: Exhaust for C 85 on a BC12D

Thanks for the replies

I am taking the Luscombe info to my mechanic to see how he feels about doing the mod.

Darryl, pictures would be great if you have them. What did you use on the left side?

Craig

[cvavon]

Re: Exhaust for C 85 on a BC12D

Look on the site for photos of crispy critter it has luscomb on it and the photos are good show it all

[barnstmr]

Re: Exhaust for C 85 on a BC12D

Here are some notes about the lessons we have learned to date about implementation of the Luscombe exhaust on Taylorcrafts.

1. Be sure to question the supplier (up front) about the welded tabs on the stacks. There are supposed to be these tabs on which the shrouds are to be attached. One of the suppliers (I cant remember if it is Univair or Wag Aero) that does not supply these tabs and you must locate and weld these yourself.

2. The so-called "silver coat" as referred to by this thread is actually more appropriately referred to as "aluminizing". It is a process by which molten aluminum is sprayed onto the steel exhaust as a rust preventative and cosmetic coating. Oil stains this stuff, but it does a pretty good job of slowing the rust degradation process that is inherent to steel exhaust parts.

3. Use of the Luscombe exhaust on Taylorcrafts with open cowl may interfere with the cowling. This can be dealt with in one of two ways. The best way is to cut a slot on the inboard side of each stack half way thru the tube about 1.5 inches below the cylinder flange, then heat and bend the whole header inward so that the headers are canted at an inward angle about 5 to 10 degrees. Then weld these slots closed. The other (less desirable) way to deal with this is to trim your cowling with larger openings around the exhaust stacks.

4. Use of RTV sealant on exhaust shrouds is a NO-NO. This can allow noxious fumes to enter the cockpit.

5. Attached is a parts listing for the installation

[flyguy]

Re: Exhaust for C 85 on a BC12D

Craig,
My left exhaust header is, I believe, an older Luscombe header with modified flanges to match a custom shroud. I'll try to get you a shot of the cowling exhaust exit area and one of a side view of the newer header installation.
DC