ou812 wrote:Thanks for all the help guys!!!! Really helped me out on this one. I flowed the old head and it did pretty good, 280 at .500 lift. Like I said, this intake port is squared at the flange. So Im working on the new head and decided to square the bottom of the intake port near the divider, made if more concave, did a 35/45/60 seat cut, opened the throat up a little, and now have 267 at .500 with the stock port opening. Check this out though, my low lift is way higher than his, at .200 my port flows 157 while the other flows 143! My port out flows it to .350 lift. At .400 my port flows 243 and the other flows 253. So...you guys think these are good numbers or am I way off. I have heard these ports can flow over 300 cfm no problem. And whats you take on making the intake port square at the flange, necessary or not????? Thanks again for all the help, seems to be working.
Brian
Brian,
Myself, .. I always look at the entire flow curve not just some peak number.
The 300 cfm heads are possible, .. but I think the fact that your head out flows
the other up to .350" is a good thing. It's area under the curve that's important.
If you can keep the low lift flow and "puff up" the high lift you'll have a good head.
You're getting there. Heck, .. how far do you open the valve anyway?
Make sure you don't have any turbulence at .400", .. flow at least at 28" H2o
and hit 36" H2o if the bench will do it.
The square intake, .. I don't like that myself. It makes the area in the port all wrong.
You go from the giant port area before the dividing wall to a much smaller
cross section after the dividing wall, .. I can't see a reason for it.
I've tried it, .. didn't show me anything on the flow bench, .. and can't see
why it would work on a turbo car.
Maybe some one else has some insight on this????