95 in compression ratio : V-Twin Forum: Harley Davidson Forums

shrinkman2 · 12-28-2006, 10:34 PM

spoke with Andrews cams guys. Looked at their site. According to him with a 95 BB, using the .030 cometic gasket and milling the heads .020 should yield about 9.7 or 9.8 compression with flat tops. Agree????

Gulfstream · 12-29-2006, 03:29 AM

It really depends on the size of your combustion chambers as they can vary a lot and it would be hard to pinpoint a compression range without knowing their size. Also, different brand pistons vary and figure into the equation too.

MaineUltraClassic · 12-29-2006, 10:21 AM

Quote:

Originally Posted by shrinkman2

spoke with Andrews cams guys. Looked at their site. According to him with a 95 BB, using the .030 cometic gasket and milling the heads .020 should yield about 9.7 or 9.8 compression with flat tops. Agree????

The only way to know for sure is to have your heads CC'ed before milling. The combustion chambers can vary a lot from what they are supposed to be.

To be at 9.7-9.8 you will have to have a 80-81 cc combustion chamber with a .030 head gasket.

What cam are you going with?

Steve

shrinkman2 · 12-29-2006, 11:47 AM

Using the Andrews 37b cams, SE flat tops.