What CR for pro stage 3 cams?

[bob]

Have a B18c engine on throttle bodies with skunk2 pro stage 3 cams and the supporting bits, looking to rebuild the bottom end to suit now. Can anyone advise what CR I should be looking at to make the most of these cams whilst still using ordinary super unleaded?

These were the rod + piston packages I was looking at, if anyone had any experience or advice it would be appreciated.

http://www.streetracersgd.co.uk/index.php/shop/category/157-piston-and-rod-special-b18c

Thanks

 

[jesse888]

Id imagine your going to want a good 11.8-12.5-1 Cr on those. As you say pump gas may be abit limiting after that, no real experience with it but the theory would seem to suggest around that area.

 

[JohnTurbo]

12.5 imo

 

[hpmx18]

Skunk2 says atleast 12.8 or higher

 

[bob]

Thanks for the replies fella's. The Wiseco pistons I was looking at are listed for 12.5:1 - 13.2:1, just unsure how our fuel holds up to that.

 

[Yazza54]

The high comp pistons are needed because the dynamic compression will be lower with the more aggressive cams in, so it may not actually be as bad as you'd think.