Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - how much power is my 454 making now? and what mods should be next?
View Single Post
  #38 (permalink)  
Old 12-19-2011, 12:22 PM
techinspector1's Avatar
techinspector1 techinspector1 is offline
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Zephyrhills, Florida, USA
Age: 75
Posts: 15,461
Wiki Edits: 326

Thanks: 1,548
Thanked 2,080 Times in 1,609 Posts
Originally Posted by 454C10
FYI, valve overlap doesn't effect cylinder pressure, as the engine isn't trying to make cylinder pressure during this part of the 4 stroke cycle. The intake closing point is what effects dynamic cylinder pressure (what you would measure on a compressing gage). And a "longer duration cam" will tend to have later intake closing point, the extra overlap is often wrongly accused of reduce pressure as more overlap typically accompanies longer duration cams.
^Agree, thanks for posting this.
Reply With Quote