Identify Porsche 356 crank
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- 356 Fan
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Identify Porsche 356 crank
I just bought a 356 Porsche crank. There is no casting number. Only the stamped numbers 524523 and C520561 or 7
Here are some pictures is a little stamping on the crank that looks like the top of a three leg puller. The letters in it are alp???
Hope you recognize it in the picture.
Many thanks,
Mike
Any idea what it is. There
Here are some pictures is a little stamping on the crank that looks like the top of a three leg puller. The letters in it are alp???
Hope you recognize it in the picture.
Many thanks,
Mike
Any idea what it is. There
- Jacques Lefriant
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- Vic Skirmants
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Re: Identify Porsche 356 crank
And you shouldn't find a casting number in a forged crank.
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Re: Identify Porsche 356 crank
ALFING Kessler GmbHMike Murray wrote:...a little stamping on the crank that looks like the top of a three leg puller. The letters in it are alp???
http://www.alfing-crankshafts.com/en/home.html
Jon Bunin
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Re: Identify Porsche 356 crank
Thanks, guys.
Was this an OEM Porsche supplier at the time? Is it something special or just a regular Porsche crank?
thanks,
Mike
Was this an OEM Porsche supplier at the time? Is it something special or just a regular Porsche crank?
thanks,
Mike
- Vic Skirmants
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Re: Identify Porsche 356 crank
They were the OEM supplier; it is a standard crank. Made around 1961-62, based on the oil holes in the rod journals.
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Re: Identify Porsche 356 crank
Vic,
Many thanks. Was it PORSCHE oem?
Many thanks. Was it PORSCHE oem?
- James Davies
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Re: Identify Porsche 356 crank
Yes, Alfing supplied 74mm cranks to Porsche from at least spring 1952. I believe these cranks were used in the 1500 Le Mans cars that year, and eventually made it into the type 546 motor (1500 normal) starting in Sept 1952. Alfing cranks were used throughout 356 production, all the way through the SC model. Alfing was *the* OEM supplier for Porsche.
Before Alfing in 1952, they used Hirth roller bearing cranks on the 1500 motors, and before Hirth, they used VW 64mm crankshafts on the 1100 and 1300 motors. I don't know who made the VW crank. Perhaps that was Alfing too?
Before Alfing in 1952, they used Hirth roller bearing cranks on the 1500 motors, and before Hirth, they used VW 64mm crankshafts on the 1100 and 1300 motors. I don't know who made the VW crank. Perhaps that was Alfing too?
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Re: Identify Porsche 356 crank
Many thanks guys.
You are the best!
Mike
You are the best!
Mike
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Re: Identify Porsche 356 crank
It's a later 50mm main journal crank having thru holes in the rod journals.
Connecting drillings have plugs.
Dick
Connecting drillings have plugs.
Dick
- Tom Markussen
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Re: Identify Porsche 356 crank
Can anyone help indentify the crank? I am opening an old motor not used for many decades, original to my 356A Coupe T2 from 1958 that now runs a 912 engine. Engine number "P 70743".
Crank: Alfing "910272", other side "34493 P".
I suppose the 910272 is the internal number of the supplier Alfing. But what is the "34493 P"?
Crank: Alfing "910272", other side "34493 P".
I suppose the 910272 is the internal number of the supplier Alfing. But what is the "34493 P"?
Tom Markussen
1958 Porsche 356A Speedster T2 #83967
1958 Porsche 356A Coupe T2 #104598
1960 Austin Healey Sprite MK1 Frogeye #AN5/43259
1955 Alfa Romeo Giulietta Sprint #349
1958 Porsche 356A Speedster T2 #83967
1958 Porsche 356A Coupe T2 #104598
1960 Austin Healey Sprite MK1 Frogeye #AN5/43259
1955 Alfa Romeo Giulietta Sprint #349
- Al Zim
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Re: Identify Porsche 356 crank
Sometime late in 1961 the Super engines received a crank that was CROSS DRILLED in the rod bearings. These engines numbers were preceded with an engine number that started with ZERO (0) I would assume that there were a great deal of cranks laying around the shop and these were used on the Normal engines. S-90 cranks had a 55MM #1 Main Bearing they were probably hardened which precluded and additional modifications. Zim
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- Tom Markussen
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Re: Identify Porsche 356 crank
Hello Zim. Thanks for the reply. I now managed to fully disassemble the crank and measure it. To my surprise it seems to be completely at production tolerances. Amazing! Pls see image.
I have indicated the cross drillings with green. Did all 356 cranks not have these cross drillings? Any idea from what year the crank is from?
I suppose the "910272" is the internal Alfing ID number. But what is the "34493 P"?
Anyone?
I have indicated the cross drillings with green. Did all 356 cranks not have these cross drillings? Any idea from what year the crank is from?
I suppose the "910272" is the internal Alfing ID number. But what is the "34493 P"?
Anyone?
Tom Markussen
1958 Porsche 356A Speedster T2 #83967
1958 Porsche 356A Coupe T2 #104598
1960 Austin Healey Sprite MK1 Frogeye #AN5/43259
1955 Alfa Romeo Giulietta Sprint #349
1958 Porsche 356A Speedster T2 #83967
1958 Porsche 356A Coupe T2 #104598
1960 Austin Healey Sprite MK1 Frogeye #AN5/43259
1955 Alfa Romeo Giulietta Sprint #349
- Harlan Halsey
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Re: Identify Porsche 356 crank
Not at all "amazing." Properly maintained 356s in normal use rarely show crankshaft journal wear at teardown. That is the reason that the current hype pushing adding full flow oil filtering to the 356 engine is silly.Tom Markussen wrote: ↑Thu Sep 22, 2022 2:42 am Hello Zim. Thanks for the reply. I now managed to fully disassemble the crank and measure it. To my surprise it seems to be completely at production tolerances. Amazing! Pls see image.
- Tom Markussen
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Re: Identify Porsche 356 crank
Harlan: Thought I was lucky. But "built to last" I guess.
Tom Markussen
1958 Porsche 356A Speedster T2 #83967
1958 Porsche 356A Coupe T2 #104598
1960 Austin Healey Sprite MK1 Frogeye #AN5/43259
1955 Alfa Romeo Giulietta Sprint #349
1958 Porsche 356A Speedster T2 #83967
1958 Porsche 356A Coupe T2 #104598
1960 Austin Healey Sprite MK1 Frogeye #AN5/43259
1955 Alfa Romeo Giulietta Sprint #349