Page 1 of 1

547 Carrera Street Exhaust

Posted: Sat Dec 31, 2022 9:43 pm
by Harlan Halsey
I thought it would be useful to be able to drive the GT Carrera on the street, but the P-Shooter exhaust is way too noisy. Of course, there was a standard street exhaust complete with heat exchangers for the GS cars, but I wanted, a much simpler exhaust which would simply substitute for the P-Shooter. The obvious solution was to fabricate a copy of the Porsche 356C exhaust which would interface directly with the 5/8" P-Shooter headers. I found a diagram of the internals of the 356 exhaust, it has three chambers, with three internal tubes and three baffles.
356%20c%20stock%20muffler.jpg
Internals.jpg
The End sections were lengthened, and the overall length shortened to 356A muffler size.
Carrera Muffler Underneath LR.jpg
I retained the 356 C center output and the S-pipes. It would be easy to move the output pipes to the 11" spacing, of the 356A and I had intended to do that to see what difference it made to the loudness, but I probably won't get around to that any time soon.
Competed Rear Deco strip.JPG
The tail pipes are chrome powder coat which is difficult to tell from chrome plate and a lot easier to fabricate. The muffler is sufficiently quiet to drive on the street, which was the objective. :D

Re: 547 Carrera Street Exhaust

Posted: Sat Dec 31, 2022 10:10 pm
by Martin Benade
How loud is it compared to a 616? Could you share the C muffler diagram? Looks like you came up with a good solution to the noise.

Re: 547 Carrera Street Exhaust

Posted: Sun Jan 01, 2023 5:15 am
by Harlan Halsey
I knew the loudness question would come up and I don't have a good answer. It's quiet enough to drive on the street. As for the diagram,
added it. :(

Re: 547 Carrera Street Exhaust

Posted: Sat Jan 07, 2023 1:46 pm
by Dick Roth
Very cool, Harlan. Miss my 59 GT coupe. Happy to say that after being squashed like a bug and totaled in the disastrous Road Scholars explosion, it is being fully restored in the Netherlands at great expense, but will rise like a Phoenix from the ashes fairly soon.
FC92E783-81BE-4FC8-A581-E8A80DD2B8AA.jpeg

Re: 547 Carrera Street Exhaust

Posted: Sun Jan 08, 2023 5:41 pm
by Greg Bryan
Harlan - did the 4-cam muffler have a retaining strap on it similar to the Euro exhaust pushrod motors?

Re: 547 Carrera Street Exhaust

Posted: Mon Jan 09, 2023 4:02 am
by Harlan Halsey
Greg,
There are small, about 1/2" dia., struts which lead from the generator stand mounting studs down through the tray to bands around the exhaust can. Slightly different between the 60 deg V drive and the 90 deg V drive. I duplicated these to support the muffler off the block. Similar function to the 356 Euro exhaust support.