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

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

http://forums.pelicanparts.com/uploa...1586586197.jpg
http://forums.pelicanparts.com/uploa...1586586197.jpg
http://forums.pelicanparts.com/uploa...1586586197.jpg

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

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.

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.

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