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Registered
Join Date: Jan 2018
Posts: 878
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Hi comp piston question
67 S.
I'm boring it out to 80.5 or 81mm as my bores are worn. I've been offered the lower comp wossner pistons at a good price. Is this something to consider or not. Lyndon |
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04-10-2020, 08:07 PM
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Join Date: Nov 2007
Location: Finland
Posts: 68
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Hi Lyndon,
I have probs opening your PM, I can see "new PM" but can't seen anything in Inbox. Will try to work on that out... To help Lyndon to get comments, here are details: Wossner (Wössner) non-S versions so comp ratio app. 9.0:1 , valve pockets looks larger than on std Mahle pistons Part Number: K9102 (actually K9102D100) Dim: 80.94mm , clearance 0.06mm Rings: 810XDS-3 Pin:WP017 Clip: CW22 Br, Ville   
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04-10-2020, 10:24 PM
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Join Date: Jan 2018
Posts: 878
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Whether or not they are suitable or the compression will be to low or maybe there is a way I can increase it.
My guess is the few dollars I save will not be worth it ?? Thanks Lyndon Last edited by Lyndon302; 04-10-2020 at 10:41 PM.. |
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04-10-2020, 10:29 PM
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Join Date: Nov 2007
Location: Finland
Posts: 68
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S-version (what Wossner sells) is 10.5 compression if I remember correctly, and some say its bit too high for 2.0 without twin plug.
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04-11-2020, 01:08 AM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,698
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10.5:1 would give some performance increase, but you'd need something better than pump gas for single plug. With 9:1 you'd be safe.
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04-11-2020, 06:01 AM
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you could add a slightly thicker cylinder base gasket to lower compression a bit. The machining of the heads will also add a little compression.
Chris |
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04-13-2020, 07:44 AM
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