swirl ports.....

Have an interesting technique, tool or just anything related to porting? Post it here . . . please no bashing anyone for the model of engine they are working, we're here to share ideas . . .

Postby Vicoor » Sun Sep 23, 2007 5:35 pm

$***@! (insert your favorite) expletive

As some of you may recall I am working on a 22RE Toyota cylinder head trying to make it better.

First I built a flowbench

Then I started experimenting with a junk head

After that post I started working on the intake ports and was able to make some moderate gains (about 18%)

So I got a new head and went to work with what I had learned. It came to the point where I was trying to get the ports to flow the same and I started running into trouble.
It seems that the dynamics of the "swirling" airstream were very sensitive to slight changes and I could not get consistent results.

It was at this point that I reasoned "a substantial redesign is in order."

see pics:

Image
Image
Image

As you can see, I've eliminated the swirl by grinding out and straightening the inside radius and then filled in the outside radius and bowl area to shape a more conventional port.

This resulted in over a 50% increase in flow despite the fact that the port volume is substantially smaller than before.

Where I am at now is at the maximaum test lift of .500" (I'll be rumnning a .425" lift cam) i get to the maximum flow for the port.

In other words when I increase the lift beyond .500" the flow stays the same or goes slightly down.

Is this good?
Vicoor
 
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Joined: Thu Jun 07, 2007 5:09 pm

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