| Racing Beat is milling rotors with an NC machine to lightened them
| up. A pound lighter was mentioned. You will also save a bit of weight
| on the balance weights. I am not sure the base line weight
| for this claim. Rotors earlier than 89 are heavier than 89 and later
| rotors.
|
| BTW Bruce Turrentine tells me he redlines the 1978 and earlier 13B
| engines with stock rotors to 6250 RPM so these engines are not as good
| to work with the 2.85:1 PSRU ratios. Later engines can be redlined
| at 7000 RPM or 7500 RPM. Better choice if you are using a 2.85:1 PSRU.
|
| This Racing Beat rotor was developed for car racing where 8500 RPM and
| above is used. I am not sure they are as light as the new RX8 rotors
| however. One advantage using these rotors with a new RX8 engine would
| be you could get low compression versions for turbo charging a new
| side exhaust port engine. Interesting. First turbo side exhaust port RX8
| in the world anyone?
|
| You will have to have your engine re balanced if you take advantage of these
| light weight rotors. Mazdatrix has some one do it and they charge $190
| for re balancing a 13B. When Perry changed to the 93 and later thrust
| bearing the front balance weight also needed to be changed so he was
| forced to have his engine re balanced.
|
| John at Mazdatrix told me the price on these rotors is little more than a new
| stock rotor. Probably around $400.
|
| Paul Lamar

sinkas wrote:

The RE amemiya showroom in Japan already diplays a turbo MSPRE, It is built
 around a mazda Cut-away display engine though.

Case

 
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