Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - new build feels under powered
View Single Post
  #77 (permalink)  
Old 10-11-2012, 07:49 AM
hpete hpete is offline
Registered User
Join Date: Oct 2011
Location: Mo
Posts: 152
Wiki Edits: 0

Thanks: 0
Thanked 7 Times in 7 Posts
I think you need a cam with zero or negative overlap. As rpm builds the pressure in your exhaust increases to the point that it's higher than the intake boost. When the intake opens during overlap it's reversing flow because of the high pressure inside the cylinder. Another thing to think about is increasing the strength of your valvesprings because of the greatly increased pressures that their dealing with. The World Products heads that you mentioned would be a good choice, the 74cc heads that Engine Quest makes for IMCA racers would work well too.
Reply With Quote