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> 4 cam engine article, Saw this some might be interested
mgphoto
post Jan 28 2026, 12:35 PM
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My favorite Porsche engine, the cam gearing reminds me of my days racing a Ducati Diana, spent a lot of time at Dan’s Cycles, building the motor.


I thought someone might enjoy.

https://www.enginebuildermag.com/2026/01/2-...3914G1587689G5W
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930cabman
post Jan 28 2026, 12:48 PM
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Great writeup, back lash is set at 0 x at least 8 times

gotta take some time to set this baby up

thank you for sharing, this was the pinnacle for many years
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Montreal914
post Jan 28 2026, 12:55 PM
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Thank you for sharing! (IMG:style_emoticons/default/smile.gif)

Very rewarding knowledge and expertise.
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gandalf_025
post Jan 28 2026, 01:01 PM
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The 4 cam engine is certainly a work of art
and the prices reflect that..

Unfortunately the only 4 cam engine I can afford is in this.



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wonkipop
post Jan 28 2026, 01:17 PM
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great read. thanks for posting. (IMG:style_emoticons/default/beerchug.gif)
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Unobtanium-inc
post Jan 28 2026, 03:19 PM
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Jeff is truly one of the masters now, he was trained by the true master, Gerry McCarthy, who went to Carrera School in the back of Hoffman's and worked on everything! If you look close you can pick a very young Jeff out of this picture.


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Jack Standz
post Jan 28 2026, 03:29 PM
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Thanks for sharing. Enjoyed seeing the insides of the 4cam.

We love our Carrera S with its 4 cams, hemi heads, and 32 valves of awesomeness. (IMG:style_emoticons/default/biggrin.gif).

Edit: Cayenne (IMG:style_emoticons/default/biggrin.gif)
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Root_Werks
post Jan 28 2026, 04:00 PM
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Only heard a 4 cam in person a few times in my life. Amazing sound with all those gears. Too bad someone over the decades never developed either a complete replica or something based on the T4.
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Unobtanium-inc
post Jan 28 2026, 04:16 PM
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QUOTE(Root_Werks @ Jan 28 2026, 02:00 PM) *

Only heard a 4 cam in person a few times in my life. Amazing sound with all those gears. Too bad someone over the decades never developed either a complete replica or something based on the T4.

Capricorn does a complete replica of the 2L plain bearing version.


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brant
post Jan 28 2026, 06:44 PM
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It used to be; that car quiet in boulder had a running 4-cam stuffed into a late 60’s bmw motorcycle. He would start it at swap meets. Probably late 1980’s time frame.

It was amazing sounding
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mepstein
post Jan 28 2026, 07:15 PM
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One of my customers has a couple of them. He told me he purchased them back in the ‘70s for $5k each. Also two speedsters for $300 each and a real RSR for peanuts. If they not we could go back in time….
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Unobtanium-inc
post Jan 28 2026, 07:44 PM
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QUOTE(mepstein @ Jan 28 2026, 05:15 PM) *

One of my customers has a couple of them. He told me he purchased them back in the ‘70s for $5k each. Also two speedsters for $300 each and a real RSR for peanuts. If they not we could go back in time….

If you find that time machine, I have a couple of stops....


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Unobtanium-inc
post Jan 28 2026, 08:34 PM
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QUOTE(mepstein @ Jan 28 2026, 05:15 PM) *

One of my customers has a couple of them. He told me he purchased them back in the ‘70s for $5k each. Also two speedsters for $300 each and a real RSR for peanuts. If they not we could go back in time….

But even with all that he can't get over the Spyder he sold in 1979, which he claims is the reason he won't sell anything now.
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mepstein
post Jan 28 2026, 08:54 PM
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QUOTE(Unobtanium-inc @ Jan 28 2026, 09:34 PM) *

QUOTE(mepstein @ Jan 28 2026, 05:15 PM) *

One of my customers has a couple of them. He told me he purchased them back in the ‘70s for $5k each. Also two speedsters for $300 each and a real RSR for peanuts. If they not we could go back in time….

But even with all that he can't get over the Spyder he sold in 1979, which he claims is the reason he won't sell anything now.

I do not know all the history but he is an interesting guy.
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Unobtanium-inc
post Jan 28 2026, 09:19 PM
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QUOTE(mepstein @ Jan 28 2026, 06:54 PM) *

QUOTE(Unobtanium-inc @ Jan 28 2026, 09:34 PM) *

QUOTE(mepstein @ Jan 28 2026, 05:15 PM) *

One of my customers has a couple of them. He told me he purchased them back in the ‘70s for $5k each. Also two speedsters for $300 each and a real RSR for peanuts. If they not we could go back in time….

But even with all that he can't get over the Spyder he sold in 1979, which he claims is the reason he won't sell anything now.

I do not know all the history but he is an interesting guy.

The RSR that he bought after it got crashed is RSR #1, won the Canadian Cup, Harry Biztek driving, if I recall. I think it was this car.
I was at his old place in Philly, three Speedsters under water bed covers in his backyard, that had been there since the 70's, rust holes the size of your fist. He said he was going to restore them, when, I asked....


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Jack Standz
post Jan 29 2026, 09:08 AM
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Cutaway image of Porsche 4-cam engine in detail (type 547 - Fuhrmann engine, 1956)

https://schranzg.artstation.com/projects/LRbyVl
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HaraldD
post Jan 30 2026, 01:29 AM
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Hi, there is another Porsche 4 cam engine... ;-)

https://911rr.de/the-engine-story/

Harald
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barefoot
post Jan 30 2026, 08:21 AM
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QUOTE(Jack Standz @ Jan 29 2026, 10:08 AM) *

Cutaway image of Porsche 4-cam engine in detail (type 547 - Fuhrmann engine, 1956)

https://schranzg.artstation.com/projects/LRbyVl


WOW very good digital images of those famous engines, very cool (IMG:style_emoticons/default/drooley.gif) (IMG:style_emoticons/default/drooley.gif)
Barefoot
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930cabman
post Jan 30 2026, 08:56 AM
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My first Speedster #74 purchased in 1971 for $800, the second #159 purchased in 1974 for $200.

If we knew then ..........

most of us have "the one(s)" that got away stories
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rgalla9146
post Jan 30 2026, 09:55 AM
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The 916 engine is/was on display at the Revs Institute in Naples, Florida circa 2020
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