2015 Mustang Ecoboost K/SA?

[Tom Broome]

Originally Posted by Jim Caughlin

I wish someone could tell me how to do that! I'm building a NA version of this motor and there isn't enough dome and head milling to get that under any condition.

The Specs say a chamber volume of 39cc, how big are your heads?
If you follow the Specs and do the math, it comes up at 13.98. Not sure where the max compression of 15.52 comes from.


I'm with you, I don't expect you will get 15:1 with around stock bore and stroke. To get there would require a TDC volume of around 40cc. Tough to do with a deck clearance that seems more workable than the Spec of .023.