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Re: VW & Audi cylinder head port info needed...
In a message dated 7/14/99 3:49:00 PM Eastern Daylight Time, OorQue@aol.com
<< e airflow restrictions are located. However, since I've only got one
5-cylinder head and have already spent some money having it jet-cleaned and
pressure-tested, I'd prefer to experiment on the junk 4-cylinder VW heads
I've got lying around instead. The ports certainly appear to be *very*
similar to each other but looks can be deceiving and since I'm not trying to
squeeze every last CFM possible out of it but merely clean up the major
restrictions, I don't want to go to the trouble of casting port molds if I
can avoid it. Any BTDTs will be greatly appreciated.
I have a small write up of porting my head on my web page-
i agree with an earlier post that you should not do too much
enlarging, only smoothing and attention to the short side radius. Also, the
valve seat can be opened up 1.5mm around the inside of the valve. I also
paid a lot of attention to the valve guide, especially on the sides of the
bowl. The exhaust side is really bad, it almost touches the side of the
bowl. Taper the sides of these. Just my BTDT. It is good that you have a
flow bench, so you are not shooting in the dark. This is also a very good
area where a cam can increase flow. Check out www.autoteck.com for a good
selection of SS valves.