924Board.org

[daniel]

Has anyone ever tried extrusion hone porting or acid porting one of our inlet manifolds? It's a bit hard to get a die grinder around those bends.

Thanks
Daniel
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet

[MikeJinCO]

From what I have read(I dropped the idea about a year ago) it is very expensive due to the fixtureing and at least one of the companies in this country was rather difficult to work with and very slow to non-performing.

I should be able to get my spare cut apart next week and then I'll go to work on it. I won't bother getting it welded back together again as it will be trash as far as I'm concerned. I'll just stick it back together enough to test it again. It would probably be a 2-3 hour welding job out here so I'm guessing $150 to $200. I can price it with the local TIG welder man after it is cut apart..

As for performance the stock one actually improved the flow at high lifts which means to me that at the medium lifts of .200 to .400" where the greatest gains are too be made due to the open duration it really should be not be an issue. On my graphs it is the area under the curve that really counts, not the peak.

On the other hand smoothing that rough sand cast surface with a 60 to 80 grit would not hurt anything and help to reduce the pressure drop through out the system, and make one feel much better about it.
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Mike


'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild)