547 Carrera Street Exhaust

Discussion of 4-Cam Type 547 engines (and all the Fuhrmann racing variants) and cars that powered them.
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Harlan Halsey
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547 Carrera Street Exhaust

#1 Post 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
Last edited by Harlan Halsey on Fri Jan 06, 2023 5:34 am, edited 1 time in total.

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Martin Benade
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Re: 547 Carrera Street Exhaust

#2 Post 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.
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Harlan Halsey
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Re: 547 Carrera Street Exhaust

#3 Post 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. :(

Dick Roth
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Re: 547 Carrera Street Exhaust

#4 Post 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.
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Greg Bryan
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Re: 547 Carrera Street Exhaust

#5 Post by Greg Bryan »

Harlan - did the 4-cam muffler have a retaining strap on it similar to the Euro exhaust pushrod motors?
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Harlan Halsey
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Re: 547 Carrera Street Exhaust

#6 Post 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.

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