 1975 1.8 Driver Restoration, Driver quality restoration of a 1975 1.8 |
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| didenpx |
 Jan 5 2026, 07:40 PM
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#61
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Member  Group: Members Posts: 109 Joined: 1-September 23 From: Usa Member No.: 27,556 Region Association: North East States 
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@Montreal914 I really know very little about these engines and am slowly learning as I go. What do you see in the photos that makes you think it may have been used in racing application? Thanks!
Paul |
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| Montreal914 |
Jan 5 2026, 10:04 PM
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#62
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Advanced Member Group: Members Posts: 2,001 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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I am not an expert either. Your specific 71.76mm number caught my attention. If this is the real stroke, then it was modified. Why would someone go to the trouble of slightly increase the stroke by only 0.76mm? The only reason I can think of is to stay within the boundaries of the 2 liter class.
Now for the 102mm cylinders, these can be problematic and known to warp as their wall are very thin. Hopefully the real engine experts will chime in. (IMG:style_emoticons/default/smile.gif) |
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| didenpx |
Jan 6 2026, 05:20 AM
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#63
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Member Group: Members Posts: 109 Joined: 1-September 23 From: Usa Member No.: 27,556 Region Association: North East States
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Thanks!
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| 930cabman |
Jan 6 2026, 05:54 AM
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#64
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Advanced Member Group: Members Posts: 4,438 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(Montreal914 @ Jan 5 2026, 11:04 PM)  I am not an expert either. Your specific 71.76mm number caught my attention. If this is the real stroke, then it was modified. Why would someone go to the trouble of slightly increase the stroke by only 0.76mm? The only reason I can think of is to stay within the boundaries of the 2 liter class. Now for the 102mm cylinders, these can be problematic and known to warp as their wall are very thin. Hopefully the real engine experts will chime in. (IMG:style_emoticons/default/smile.gif) Waiting also, have wondered why 98 or 100mm pistons are not a thing. If 102 and greater are trouble, why not reduce the size a bit? |
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