sugaryling

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Any of you guys (girls) have Zimmerman cross drilled rotors?

The cross drilled holes that radiate out from the center, should they be installed so that the holes (or slots) facing the rear or front? The passanger and driverside should both face the same direction right? Or does it not matter?

Here's a pic of a set of rear Zimmermans I got (hub facing up). If I install these, one side will have the holes face counter clock wise and one side clock wise.

kingfishgrapejam

It doesn't matter.

CHof

The direction does matter technically speaking. The internal vanes are a compressor impeller, pulling air from the center of the rotor &amp; expelling it out the openings at hte outside diameter. The curvature of the vanes does matter with respect to rotation, running backwards the impeller will flow about 70% of design. Purely radial vanes, the rotation doesn't matter.

Note that the drilled pattern doesn't necessarily match the curvature of the vanes internally.

The direction can be determined (and confirm that I'm not pulling your leg with all this babble) with these diagrams:

http://www.stoptech.com/tech_info/faqs.shtml#16

JT's allroad

<ul><li><a href="http://www.stoptech.com/tech_info/faqs.shtml#16">click here</a></li></ul>

sugaryling

so i guess it doesnt matter which way the drill holes are facing just as long as the vanes are in the direction, which on the Zimmermans, are straight.

sugaryling

Thanks! That cleared everything up

kingfishgrapejam

in the box.