 1.8 - 2.0 Frankenstein, Using 2.0 C&Ps on 1.8? |
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| SteveNMaine |
 Oct 18 2025, 05:31 AM
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Member  Group: Members Posts: 94 Joined: 12-August 24 From: Maine Member No.: 28,288 Region Association: None  |
Last winter I built a 2056 using a 1975 2.0. This winter I am rebuilding a 1974 1.8.
The 1.8 has one trashed C&P so I am wondering if I can use the old 2.0 C&Ps for my rebuild, using all four of course. Everything seems to fit; head to cylinder register, cylinder to block register, wrist pins for connecting rod, etc. There is only a +1mm difference in bore diameter. I am not trying to build a HP engine just something close to stock. Any insights? |
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| SteveNMaine |
Oct 19 2025, 06:19 AM
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Member Group: Members Posts: 94 Joined: 12-August 24 From: Maine Member No.: 28,288 Region Association: None |
So, I see two different part numbers for 1.8 pistons and cylinders for 1974, 022 198 075 A and 021 198 075 D.
I have seen the D described as a higher compression design, but will it fit? Also, the 021 198 075 D is listed as 1.8V and the 022 198 075 A is listed as 1.8 in the Model/Option/Info column of the Porsche parts diagram, what is the difference? |
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Posts in this topic
SteveNMaine 1.8 - 2.0 Frankenstein Oct 18 2025, 05:31 AM
Mike D. IIRC, I think you would have very low compression.... Oct 18 2025, 10:15 AM
SteveNMaine
IIRC, I think you would have very low compression... Oct 18 2025, 11:24 AM brant Agreed. The wrist pin height is different
Get a ... Oct 18 2025, 10:18 AM chmillman
So, I see two different part numbers for 1.8 pist... Oct 19 2025, 06:24 AM Dave_Darling That's correct. The 1.8V engines ran somethin... Oct 19 2025, 07:56 PM |
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