 Help to Identify These Pistons |
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| Tom1394racing |
 Feb 25 2026, 09:23 AM
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#1
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Senior Member  Group: Members Posts: 508 Joined: 25-August 07 From: CT Member No.: 8,039 Region Association: North East States 
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While going through my stash of parts, I found this unused piston set. Flat top, no valve pockets, 82 mm diameter with Kobelschmidt markings. They do not seem to match any Porsche or VW specs that I am aware of.
Does anyone recognize these?     |
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| Krieger |
Feb 25 2026, 09:51 AM
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#2
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Advanced Member Group: Members Posts: 4,838 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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I see K with an S over it. Kolbenschmidt (IMG:style_emoticons/default/confused24.gif)
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| Jack Standz |
Feb 25 2026, 02:16 PM
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#3
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Senior Member Group: Members Posts: 716 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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Best guess is that those are Type 1 1500 pistons.
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| fixer34 |
Feb 25 2026, 06:00 PM
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#4
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Senior Member Group: Members Posts: 1,392 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
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Dug out my old Type 3 tech manual. 1500 engines were 82.95mm and 1600 were 85.45mm. It says that KS and Mahle pistons were used, but probably not VW pistons.
Also looks like 'racing style', there isn't much of a lower part of the piston. |
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| Jack Standz |
Feb 25 2026, 07:14 PM
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#5
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Senior Member Group: Members Posts: 716 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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Yeah, it seems my memory is off by about 1mm on the 1500 pistons. Don't think either the 356 or 912 ever used an 82mm bore piston.
Next guess is an industrial motor or a schlepper motor (although the piston skirts seem to be more in line with a stroked motor?). (IMG:style_emoticons/default/biggrin.gif) |
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| Tom1394racing |
Feb 26 2026, 07:49 AM
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#6
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Senior Member Group: Members Posts: 508 Joined: 25-August 07 From: CT Member No.: 8,039 Region Association: North East States
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Thanks for all your suggestions. Chat GPT helped me determine that these are BMW 1.5L pistons.
Bore - 82 mm Stroke - 71 mm CR - 8.5:1 1962-1977 |
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