Fix a six, Like Neil Young says...rust is an insomniac Options

[barefoot]

I have one here. I'll take a few pics of it on Monday.

I found these pics of Ben's GT mount. I can't recall which members car this was.

That muffler mount does not provide any fore & aft flexibility to accommodate
differential thermal expansion between the exhaust headers & the engine/tranny combo.
The headers will expand much more than the engine/tranny cases at operating temperatures and the mount should be able to flex to handle these movements.

Porsche designed the stock muffler brackets with lots of four/ft flex for this reason.
A fatigue failure in the making, sorry.

Barefoot

[rgalla9146]

I have one here. I'll take a few pics of it on Monday.

I found these pics of Ben's GT mount. I can't recall which members car this was.

That muffler mount does not provide any fore & aft flexibility to accommodate
differential thermal expansion between the exhaust headers & the engine/tranny combo.
The headers will expand much more than the engine/tranny cases at operating temperatures and the mount should be able to flex to handle these movements.

Porsche designed the stock muffler brackets with lots of four/ft flex for this reason.
A fatigue failure in the making, sorry.
vibration
Barefoot

Very keen observation about the OEM 914 6 rear hangar.
It seems too simple for its job but it's that way to allow for vibration and expansion. More than is present in 911s with short, rigid HEs.
Don't forget, stock 914 6 mufflers have a long curve away from the tail of the transmission

[mb911]

I have one here. I'll take a few pics of it on Monday.

I found these pics of Ben's GT mount. I can't recall which members car this was.

That muffler mount does not provide any fore & aft flexibility to accommodate
differential thermal expansion between the exhaust headers & the engine/tranny combo.
The headers will expand much more than the engine/tranny cases at operating temperatures and the mount should be able to flex to handle these movements.

Porsche designed the stock muffler brackets with lots of four/ft flex for this reason.
A fatigue failure in the making, sorry.

Barefoot

Well kind of but a GT car had a bracket like that not the v style mount. I sold several thousand mufflers from when I owned M&k exhaust to approximately 2020. I believe Mark is right no one used the stock tranny but a side shift. The reason for the mount that I use to make vs the stock mount is the stock mount only supports the flanges and many muffler would break at the inlets. The stainless is only .036-.040” thick so not much support. I also want you to think about how a 911 muffler is supported. I also suggest that the width of the engine changes much more during heating cycles than lengthens.

[Speedo]

"Porsche designed the stock muffler brackets with lots of four/ft flex for this reason.
A fatigue failure in the making, sorry."

I planned on using both the factory mount and some sort of GT3 mount in addition.
Redundancy to the rescue...problem solved!

[mepstein]

Ben sold a bunch of these mounts along with his mufflers. I haven’t heard of any failures. That’s not a scientific test but real world for now.
I use it on my 3.2 conversion car.

[Montreal914]

Maybe Ben can make a nice dimple in your muffler to fit your tail cone? (IMG:style_emoticons/default/confused24.gif)

[Speedo]

Maybe Ben can make a nice dimple in your muffler to fit your tail cone? (IMG:style_emoticons/default/confused24.gif)

I was going to "cup" the back of the muffler to create space, but I searched for and found some exhaust flanges that I will use as spacers to keep the muffler away from the nub on the tailcone. I have plenty of room under the heat shield to move the muffler aft 3/4". Interesting aside...Walker makes the flange part #31800. Not only is it difficult to find, but resellers price it $5-$22, it is NLA most places or not in stock. Everybody has it in their catalogue, but it is only available online? I would rather not beat on the muffler, and risk busting the welded seam. At some point I may go back to a stock muffler and would rather not have to explain to a future buyer why I beat the crap out of the back of the very nice muffler. Keeping my options open.

[porschetub]

Lars think your last part in your reply makes more sense for the interim and will get up and running ,being a 911 guy you will have a good 911 muffler in your collection and only requires a tailpipe change / remodel to suit the rear valance, cheers.