The other option I'm looking on the REPU is a 225mm disc, but a 215mm pressure plate!! It is possible. The reason I mention it is because early RB light steel flywheels were never clearanced along the upper lip making it not a good idea to use a 225mm pressure plate as the rivits contact the lip bit 215mm have plenty of clearance.
So here we see a non clearanced RB light steel flywheel.
225mm disc
stock rusty 215mm pressure plate
installed
5mm gap
Total grip is of course less than a complete 225mm setup, but still more than a complete 215mm setup. Let's call it 220mm.
This is an option available to me and would probably work well in the REPU.
What do you guiys think? I think the lighter intertia of a 215mm pressure plate would be ideal in the REPU with a supercharger, and the extra holding capacity of the street strip pressure plate would make up for the slightly reduced friction surface. Plus the disc itself will still have 225mm of grip against the flywheel surface.
I will go ahead with this idea if it is recommended to use full 225mm components with the 20B. Besides, the last time the 20B ran, it had full 225mm stuff, and it *blipped very nicely.
* blipped is like "tip in" when you blip the throttle and the car lurches forward. In other words the higher intertia of the 225mm components did not feel heavy. Even with the extra rotating weight of a 3rd rotor, it did not feel heavy. A 12A with the same 225mm stuff feels heavy by comparison. Hence the reasoning earlier about wanting to use the super light 8 pound flywheel with the 12A in the FB and continuing to use it with the 20B even though it might cause slipage or possibly break the clutch lining from the springy marcels or some other catastrophic failure. It would work fine during break in, but probably wouldn't stand up to the torque for very long after.