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> Source for lightweight muffler brackets/hangers, The one on 914R broke today, not sure where I got it
campbellcj
post Jun 27 2015, 11:10 PM
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Hi all,

At the track today my muffler/megaphone hanger broke. Does anyone know where to get this type with the holes? I thought it was pretty cool, except for the breaking part. It did last several years.

I know I can use a stock 2.0 one for this application but I don't think I have one at the moment and I think it's heavier and boring lookiing. (IMG:style_emoticons/default/first.gif)

Thanks!

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lonewolfe
post Jun 27 2015, 11:15 PM
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QUOTE(campbellcj @ Jun 27 2015, 10:10 PM) *

Hi all,

At the track today my muffler/megaphone hanger broke. Does anyone know where to get this type with the holes? I thought it was pretty cool, except for the breaking part. It did last several years.

I know I can use a stock 2.0 one for this application but I don't think I have one at the moment and I think it's heavier and boring lookiing. (IMG:style_emoticons/default/first.gif)

Thanks!

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That's an Engman exhaust hanger. Unfortunately he is no longer with us. He made some great products and was a really nice guy. I'm surprised that bracket broke like that. I have one that I'll be installing as soon as my new motor is finished being built.
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falcor75
post Jun 27 2015, 11:59 PM
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How does the unbroken end look? It's probably a fatigue crack that caused the failure.

It shouldnt be too hard to trace that onto a paper and go to a company with a lasercutter/waterjey and have some blanks cut.
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rgalla9146
post Jun 28 2015, 08:05 AM
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You'd think the reinforcement would prevent that failure.
Mmmmmmm......are you going to use that MFI cam ?
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EdwardBlume
post Jun 28 2015, 08:13 AM
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Cool piece, and I would probably want one too.

For me, the stock piece and some time at the gym would get it done. (IMG:style_emoticons/default/av-943.gif)
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Andyrew
post Jun 28 2015, 11:29 AM
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Why not reweld it?
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barefoot
post Jun 28 2015, 12:18 PM
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QUOTE(rgalla9146 @ Jun 28 2015, 10:05 AM) *

You'd think the reinforcement would prevent that failure.
Mmmmmmm......are you going to use that MFI cam ?

that reinforcement termination was the cause of the break by creating a hard point for bending to originate, continued flexing in that area led to fatigue.
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mepstein
post Jun 28 2015, 12:27 PM
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Or just weld back what you have with a tiny reinforcement on each side and your good to go.
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914_teener
post Jun 28 2015, 12:58 PM
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QUOTE(barefoot @ Jun 28 2015, 11:18 AM) *

QUOTE(rgalla9146 @ Jun 28 2015, 10:05 AM) *

You'd think the reinforcement would prevent that failure.
Mmmmmmm......are you going to use that MFI cam ?

that reinforcement termination was the cause of the break by creating a hard point for bending to originate, continued flexing in that area led to fatigue.



Yep....also heat expansion/contraction.


Trace it draw it up in cad and have someone burn it out for you Chris.

I have Pro E or Solid Works if you want it done. I can't fab it though, a 4 foot laser table is still on my bucket list.
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campbellcj
post Jun 28 2015, 06:51 PM
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Thanks everyone! Shoot, I had not realized it was an Engman product. I did buy several bits from him. It does seem correct that the break was in between the reinforcing weld points.

I can't simply re-weld as the broken-off piece is somewhere at Willow Springs -- I hope not embedded in somebody else's car. (IMG:style_emoticons/default/blink.gif)

Thought about having a small run of these made but I figure like many boutique vintage parts, I'd probably sell 3 and be stuck with the rest for eternity. Would be extra sweet in stainless steel, I think.

I'll do some web searching and if nothing turns up, maybe I'll try drilling holes in a stock one "R" style. (IMG:style_emoticons/default/sawzall-smiley.gif)
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brant
post Jun 28 2015, 11:28 PM
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Sorry for the track problems.
Fab one from aluminum. Not hard and you can someone else weld it cheaply if needed
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falcor75
post Jun 28 2015, 11:58 PM
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I'd go with Stainless over aluminum...if the steel part suffered from fatigue failure the aluminium will do the same but much quicker unless you make it really sturdy.
Alu will also have the chance of transfering more heat into your gearbox.

(Fatigue strength increases with the yield strength of the material.)
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maf914
post Jun 29 2015, 07:35 AM
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I remember those exhaust brackets when posted on the forum several years ago. I wondered at the time how much lighter they were versus a stock 914 muffler bracket. The stock brackets are steel metal stampings with the strength and stiffness increased by the curvature of the stamped shape. The light weight version appears to be a flat sheet with a welded rod added to increase the stiffness. Add more rod, add more weight.

Does anybody know the weight difference?
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Krieger
post Jun 29 2015, 09:04 AM
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Get a stock one and drill some holes to lighten...
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rjames
post Jun 29 2015, 10:15 AM
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How much of a difference between where the end of the hanger end wants to rest when not bolted up and where it sits between the muffler and exchanger when installed?
The end should line up fairly closely at rest to where it's at when bolted up. If not, you're going to stress the hanger unless it's made to line up properly.
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barefoot
post Jun 29 2015, 05:21 PM
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QUOTE(rjames @ Jun 29 2015, 12:15 PM) *

How much of a difference between where the end of the hanger end wants to rest when not bolted up and where it sits between the muffler and exchanger when installed?
The end should line up fairly closely at rest to where it's at when bolted up. If not, you're going to stress the hanger unless it's made to line up properly.

If it lines up in the North-South direction at room temperature, thermal growth of the H/E's or headers at operating temperature will result in the little ends moving south by perhaps 1/2". You need flex capability to accommodate this movement or the result will be what you saw in this thread.
That's why the stock hangers do not have reinforcements like these.
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914forme
post Jun 30 2015, 08:12 AM
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Just make your own, tube, and FLAPs exhaust hangers mounted off the trans like stock via a flat plate. A little (IMG:style_emoticons/default/sawzall-smiley.gif) (IMG:style_emoticons/default/smash.gif) (IMG:style_emoticons/default/welder.gif) your done. Wish I had pictures of my old setup but it is long since gone, and I just cut it up a month or two as I needed the tube for another project. IT was 3/8" tube, or maybe 1/4" can't remember. 1/8" wall though, so it took a conduit bender to fit it up.
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brant
post Jun 30 2015, 08:49 AM
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version 1 that we made:


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brant
post Jun 30 2015, 08:50 AM
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version 2:


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campbellcj
post Jul 14 2015, 09:53 PM
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So I have a new repro one in-hand now but am unsure that drilling or cutting some of the material away is a good idea with regard to overly weakening it. Obviously the weight savings would be negligible (although every ounce counts) and it'd largely be for looks.

Thoughts?

(IMG:http://www.914world.com/bbs2/uploads_offsite/c767170.r70.cf2.rackcdn.com-21-1436932438.1.jpg)
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