Senior Tech Team
Join Date: Apr 2012
Location: Yerington, Nevada
Re: Found why the Closed Chamber heads did not work
Ever hear of an early Buick NAIL HEAD engine? Those engines had what is referred to as a "tulip shaped head" valve set.
Now, I am fully aware the cylinder head gurus will bo bonkers over this,m but, it is not ll porting to make a head work.
Almost every head guru does it dead wrong, they "flow" a port DRY, air only, and there lies the rub. Does your engine run on air only? I doubt it, they run on a WET fuel/air mixture, not dry air.
Ever see a fog mist change direction in a fog bank? Same thing occurs in a port, even though the mixture is under vacuum.
The Buick people knew this, and developed one other facet of their Nail Head port/valve development, PUTTING THE WET MIXTURE IN THE RIGHT PLACE IN THE CHAMBER.
The tulip directed mixture flow to where it needed to be in the chamber to be most efficient. And, helped to make transition mixture flow in the port go where it should go.
The biggest problem with dry flow head work is, do the ports actually do what they should, get the mixture to everywhere in the chamber, or, does it literally force dry, dead fill areas in that chamber.
The closed chamber big block heads had a few very bad flow paths, and created lean spots with the wrong flow fill patterns.
Think about this the next time you decide to go insane portng nuts, and hog that port bowl out, cut that valve, etc.