Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Compression Calculator Help
View Single Post
  #22 (permalink)  
Old 11-16-2012, 11:42 AM
techinspector1's Avatar
techinspector1 techinspector1 is online now
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Zephyrhills, Florida, USA
Age: 75
Posts: 15,337
Wiki Edits: 326

Thanks: 1,504
Thanked 2,021 Times in 1,561 Posts
Originally Posted by allansmith859 View Post
are those strictly designed to raise compression ratios. Correct me if Im wrong, do they make the so called dome, raised so there is less area in the combustion chamber therfore creating more compression??
Yep, you are right on the money, except they create less VOLUME rather than less area. Once you have the displacement of the dome, you can deduct that figure from the chamber volume and then figure the piston at a zero value for figuring the static compression ratio.

In other words, if you were using that piston I linked with a 76cc chamber, you would deduct the 6cc's of the piston dome from the chamber volume and use a zero value for the piston as you do the calculations for SCR. If the dome is 6cc's, then deducting that from the chamber volume would yield a 70cc chamber for calculating.
Reply With Quote