RV-8 vetterman 4-pipe install

[flyingbeaver26]

Here are a couple of pictures of my 4-pipe system in my -8. The exhaust is very nice quality. Having a little welding experience myself, I'd say these welds are flawless. My question is: I'm about to cut the steel support tube to length to support the lower half of the exhaust. Before I cut, I wanted to ask the forum to see if my placement looks to be acceptable. The 4-pipe system only comes with one strut to vertically support the two pipes. Thanks for your feedback.
-Brad

[Special Delivery]

You may want to reconsider using the engine mount to support the exhaust pipes. Supporting the exhaust from the engine might be a better method, but check with Vetterman for his recommendation.

[fstringham7a]

Hi Ernie

I have the 4 pipe on my RV7A and the recommended procedure was to use the provided fastners, which use the motor mount tubes as secure points.
Haven't flown yet...but Larry Vetterman told me he uses the four pipe set up on his plane.

Frank @ 1L8 ...RV7A... painting still.....looking for some warmer weather!!!!

[cdmiller]

I recommend using the rear sump bolt(s) to support the exhaust pipes. That way the exhaust and engine move together but the exhaust is still supported. I supported the two-pipe Vetterman exhaust from the sump bolts in my RV-8 and that has worked very well for more than 500 hours. Supporting the exhaust pipes from the engine mount as you have illustrated will put a lot of stress on the exhaust system whenever the engine shakes during start up and shutdown.

Dan

RV-8 530+ hours

[Bob Axsom]

I am considering a different arangemant than the "cross-over two pipe" that I have on my RV-6A and this may satisfy my needs. If it eliminates the crossover and can bbe routed straight back without having to come inboard where the current cooling air outlet is located it would be ideal. Do you have photos of the rest of the pipe routing?

Bob Axsom

[flyingbeaver26]

Originally Posted by Bob Axsom

I am considering a different arangemant than the "cross-over two pipe" that I have on my RV-6A and this may satisfy my needs. If it eliminates the crossover and can bbe routed straight back without having to come inboard where the current cooling air outlet is located it would be ideal. Do you have photos of the rest of the pipe routing?

Bob Axsom

Bob, I took some aditional pictures for you last night. -Brad Vier

[frazitl]

included two rubber "donuts" to be placed in the mounting straps between the motor mount and the pipes. I too would be concerned about mounting the end of the pipes to the motor mount, and the flange of the pipes to the engine. Too much relative movement for me.

[Mike S]

The two pieces of metal tubing you show in the first photos are joined by a short piece of rubber hose, correct??

This will allow movement between the pipe/engine assembly, and the mount.

I would cut the tubes a bit shorter, leave a half inch gap or so when inserted into the rubber tube----will allow more freedom of motion if the ends of the metal tube dont bump into each other.

Good luck.

[Bubblehead]

Originally Posted by frazitl

included two rubber "donuts" to be placed in the mounting straps between the motor mount and the pipes. I too would be concerned about mounting the end of the pipes to the motor mount, and the flange of the pipes to the engine. Too much relative movement for me.

Any pictures of the donuts or a scan of the drawing from Larry? I've installed an AWI 4-into-1 and am not satisfied with the way I've supported the rear of the exhaust.

[frazitl]

I'll take and post some photos tomorrow. Larry's drawing is not his best work (but the pipes are beautiful!).