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Extrude honing... (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Paul H. on January 26, 2000 at 04:03:33:

In Reply to: considering buying a 89-93 535i posted by BMWenthus on January 25, 2000 at 17:47:05:

: One other item that makes a significant difference is extrude-honing the intake manifold. Significantly (seat of the pants) added torque to the lower rpm range.

Can you explain the process a little? Is the aim to increase the bore of the manifold, smooth out burrs, match the ports or what? How does it help low RPM torque?


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