resurface Flywheel

[rw7810]

I seem to remember that there is a "right" way and wrong way to resujrface a porsche flywheel. Can anyone please enlighten me??

[Wayne 962]

It depends upon the year?

-Wayne

[rw7810]

It's a 225 mm for a 2.2

[Wayne 962]

If memory serves me correctly, you need to resurface both the top and bottom and have them be exactly a certain distance apart, otherwise the pressure plate will not work correctly. Our shop (EMS) knows how to do this - I just give the flywheels to them...

-Wayne

[john walker's workshop]

wayne, you're thinking about the 69 and earlier wheels. the 70 up are just one surface. the outer edge of the cut can't have any bevel to speak of, so the p/plate can seat properly, so a diamond stone needs to be used. a diamond stone keeps a sharp edge, unlike a softer stone which will round off quickly. but they are about $250, so call around, as not everyone uses one.

[911pcars]

If I could add to John's comments. The cutter tool for flywheels, as well as for brake rotors, should be a grinding stone (diamond or otherwise). A typical tool-steel cutter is not hard enough to cut through work-hardened metal (created by hot-spots), and it will skip over the surface and dull the cutting edge.

Sherwood Lee
http://members.rennlist.org/911pcars

[snowman]

Sherwood,

What about carbide cutters?

[911pcars]

Carbide cutter? Hmmm. I'd say if the material has hard spots in it, go with a grinding stone. It also provides a nice even finish without increasing the rotation speed of the workpiece. What's your analysis?

Sherwood

[snowman]

Only thing I have heard is that if you have hard spots, ie dark spots, your flywheel, pressure plate, or brake rotor is history. In other words, it can be machined, but it will never wear properly.