 Mystery Crank, ID? |
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| trojanhorsepower |
 Jan 20 2026, 07:40 PM
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#1
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Senior Member  Group: Members Posts: 1,028 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None  |
Anyone know how to ID this crank shaft?
Attached image(s)  
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| Superhawk996 |
Jan 20 2026, 07:59 PM
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#2
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914 Guru Group: Members Posts: 7,647 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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Measure the rod journals
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| Dave_Darling |
Jan 21 2026, 02:18 AM
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#3
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914 Idiot Group: Members Posts: 15,315 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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And the crank throws.
Is this from a Type IV engine, or did it show up on its own? --DD |
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| Montreal914 |
Jan 21 2026, 02:48 AM
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#4
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Advanced Member Group: Members Posts: 2,012 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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Based on the rods being 2liter, this could be 71mm or more if stroked.
Doesn’t look like it’s stroked though as there should be additional material welded on either side of the crank to laterally support the rods. Clearly welded counterweights. But to your question; DPR were making them that way (welded) but something tells me they would brand their cranks. (IMG:style_emoticons/default/confused24.gif) |
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| 914Sixer |
Jan 21 2026, 06:55 AM
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#5
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914 Guru Group: Members Posts: 9,395 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Check out the connecting rods and bolts ground off.
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| Superhawk996 |
Jan 21 2026, 07:22 AM
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#6
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914 Guru Group: Members Posts: 7,647 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(914Sixer @ Jan 21 2026, 08:55 AM)  Check out the connecting rods and bolts ground off. (IMG:style_emoticons/default/new_shocked.gif) You guys clearly spent more time looking at that photo than I did. (IMG:style_emoticons/default/av-943.gif) |
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| trojanhorsepower |
Jan 21 2026, 07:48 AM
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#7
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Senior Member Group: Members Posts: 1,028 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
Thanks all. I will check the journals tonight, if I remember correctly with out cleaning they were around 50mm. This is out of a big bore 103mm type 4 (GA) engine. I think the crank has a VW symbol on it but it is hard to tell. Definitely has welded counter weights.
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