Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 305
Thread: 305
View Single Post
  #14 (permalink)  
Old 02-10-2013, 12:00 PM
ssmonty ssmonty is offline
Registered User
 
Last photo:
Join Date: Mar 2007
Location: Corinth, MS
Posts: 601
Wiki Edits: 0

Thanks: 0
Thanked 28 Times in 27 Posts
160psi does not indicate 11:1 compression ratio.
I can't give you the formula to figure out the psi result of 11:1 CR, but I can tell you it has allot to do with when the intake valve closes. If you have a long duration cam the psi will be lower than if you have a short duration cam period. An 8.5:1 CR engine with a short duration cam can have as many psi as a 12:1 CR engine with a long duration cam.
You may want to download the CR calculator near the end of this article. Good article by the way. Dynamic CR
Also you might want to grind out that "swirl vane" next to the intake valve guide to give you a little more performance.
Also IMO a double pumper works better with a manual transmission where a vacuum secondary carb works better with an automatic trans.
ssmonty
Reply With Quote