Intake ports

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V Mad
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Intake ports

Postby V Mad » Tue Oct 30, 2007 10:27 am

I noticed that the intake ports on the stock manifold are much smaller than those on the head. Even on a later aluminium (4 barrel) manifold that I have ready to fit, the ports are just as small.

I reckon that its worth matching up the manifold and intake port sizes to get rid of the sudden change in cross section. I would think this should improve gas flow.

Any thoughts comments?
Chris across The Pond :-)
Tiger 260 Mk1

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Location: Fort Leavenworth, KS

Postby Duke » Tue Oct 30, 2007 5:07 pm

Port matching is a very common performance modification. Make sure that the manifold ports do not get larger than the head ports. A step from smaller to lager is preferable than a larger to small step that will cause a hard shelf air turbulence problem. Of course, a perfect port match is the best. Don't forget to port match the gaskets too.

I do not recommend any polishing of the intake tract. You want some surface tension to help mix the air/fuel.

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Postby alpine_64 » Tue Oct 30, 2007 5:30 pm

Its ok to polish intake runners, just dont polish them to a high shine, leave a textured swirled surface on the runner and it will help the fuel swirl. here is an image of the finish on my intakes on my alpine, little hard to see but yuo get the idea: ... 2410eVpdnv
Michael King
1963 Alpine SII
1965 Alpine SIVGT
1965 Tiger MKI
1966 Tiger MKIA

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