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,
I added it. :(
Last edited by Harlan Halsey on Tue Nov 07, 2023 5:09 am, edited 1 time in total.

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.

Alan Klingen 2
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Re: 547 Carrera Street Exhaust

#7 Post by Alan Klingen 2 »

Be very careful the exhaust drastically effects the low rpm response of the motor. Alan The Stable.

Peter Hofmann
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Re: 547 Carrera Street Exhaust

#8 Post by Peter Hofmann »

Dear guys,
I have two different 547/692 exhausts except the pee shooter, a street one with two pipes and a Sebring with a great sound which works on the street as well,
regards from Germany
Peter
www.classic-parts.com

Alan Klingen 2
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Re: 547 Carrera Street Exhaust

#9 Post by Alan Klingen 2 »

Be very careful with the exhaust too frre flowing and you can say good bye to any good low=end power. Alan The Stable.

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Harlan Halsey
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Re: 547 Carrera Street Exhaust

#10 Post by Harlan Halsey »

Alan, I don't think that with the roller crank I would use the words low end and power in the same sentence. Carrera 2s may lug around, but my A Carrera only has power above 4,000. Back in the day, service amounted to changing the clutch disk and the plugs every 8,000 miles, so this is nothing new. The purpose of this muffler is only to let me exercise the car a bit between races. It does that.

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Re: 547 Carrera Street Exhaust

#11 Post by Alan Klingen 2 »

The street exhaust is fine and original but what a bear to fit and install!! Alan The Stable.

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Harlan Halsey
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Re: 547 Carrera Street Exhaust

#12 Post by Harlan Halsey »

Alan Klingen 2 wrote: Mon Nov 27, 2023 3:30 pm The street exhaust is fine and original but what a bear to fit and install!! Alan The Stable.
My objection to the Carrera street exhaust is simply to the weight and complexity of the thing.

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Martin Benade
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Re: 547 Carrera Street Exhaust

#13 Post by Martin Benade »

[quote="Harlan Halsey" post_id=446227
[/quote]

My objection to the Carrera street exhaust is simply to the weight and complexity of the thing.
[/quote]

It shares those qualities with the Carerra engine; it’s perfect.
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Alan Klingen 2
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Re: 547 Carrera Street Exhaust

#14 Post by Alan Klingen 2 »

The 4cam becomes almost un-drivable it will lose all it's low-end power. Alan The Stable.

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Joris Koning
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Re: 547 Carrera Street Exhaust

#15 Post by Joris Koning »

Having first hand experience with the 547 street system I can say its a total bear to install. Putting the engine in the car is virtually impossible without at least some scratches.
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