lml@lancaironline.net Mailing List Archive

Tom,

Good Point. I forgot to mention pipe expansion. I figured on seeing about 1/8" of growth in length based on pipe length, CTE and a temperature delta I assumed way back when. My hanger forms a triangle in a single plane. Two corners are attached to the engine case and the third at the pipes. This geometry is very rigid in the vertical and lateral axes to restrain movement caused by engine operation, but allows for growth in pipe length. The two legs are thin walled 4130 tubing with forks pressed into each end. Bent tabs form the connection at each end.

Chris Zavatson

N91CZ

360std

http://www.n91cz.net/

Sent from my spiffy iPhone

On Mar 13, 2014, at 4:49 AM, dudewanarace@yahoo.com wrote:

I built an exhuast hanger like Chris speaks about. I wanted a rigid mount that moved with the engine.

Here is the mock up:
http://www.n54sg.com/images/exhaust/hanger_01.jpg

And then the final welded part.
http://www.n54sg.com/images/exhaust/hanger_02.jpg

Moral of the story, I'm not a welder and shouldn't pretend to be one. It cracked at my weld, casting doubt on the idea. But, after I had both of them re-welded by someone who knows what they are doing, all has been good since then.

I have moved the weak link to the clamp around the pipe. Something one of the Unlimited racers reminded me of is that the pipes grow in length, so there needs to be a way to account for that. So far, what I have done is just not clamp them so tight allowing the clamp to pivot forward and aft. Worked so far!

Tom McNerney
http://www.n54sg.com/