PDA

View Full Version : WISECO Compression


gojk
12-13-2002, 09:55 AM
I just bought a WISECO 87 mm 11:1 compression piston with cometic gaskets, and I was wondering what I need to do to get it to true 11:1 or as close as I can.
PHIL_B54
12-13-2002, 10:03 AM
im not much help but the best thread ive ever read discussed just that. its long but well worth reading the whole thing

search for "Have you Decked the cylinder"

hope it helps

phil
nakomis0
12-13-2002, 10:37 AM
The Weisco is about 9:1 comp I think. You would need thin gaskets or a decked cylinder.

To find out all you need to know might wanna go read the thread 'Decking the cylinder' its a huge thread but worth it.
gojk
12-13-2002, 11:55 AM
From what I read that is only with the 440 pistons though, right? That is what I was told before I bought the piston. It was said that it will be close to 11:1, but not close. I started reading the Decking the Cylinder thread, but it was all about the 440 pistons.
gojk
12-13-2002, 02:01 PM
bump
MIKE400EX
12-13-2002, 02:32 PM
From what I can remember, there was only an issue with the Wiseco 440's (89.0 mm), but it wouldn't hurt to check any of them, no matter what brand.
F-16Guy
12-13-2002, 02:48 PM
Gojk,
I have that piston in my bike. I did all of the math while putting it together, and the compression comes in at just under 11:1 (10.92:1 or something like that, can't remember exactly). If you choose to run an XR head gasket (0.025"), you should be at just a hair over 11:1. I stayed on the low side so I could get away with pump gas a little easier (but I still need race gas for the dunes, etc.) The compression error seems to only affect the Wiseco 89mm piston, which is a flat top (correct me if I'm wrong). The 87mm is domed.
gojk
12-13-2002, 03:10 PM
Originally posted by F-16Guy
Gojk,
I have that piston in my bike. I did all of the math while putting it together, and the compression comes in at just under 11:1 (10.92:1 or something like that, can't remember exactly). If you choose to run an XR head gasket (0.025"), you should be at just a hair over 11:1. I stayed on the low side so I could get away with pump gas a little easier (but I still need race gas for the dunes, etc.) The compression error seems to only affect the Wiseco 89mm piston, which is a flat top (correct me if I'm wrong). The 87mm is domed.


That is good, that is what I was hoping to hear. Thanks for the good news.