Help me upgrade clutches in my REPU, rotary GLC and FB

[Jeff20B]

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.

[Jeff20B]

Ah screw it.

Why don't I do this:

REPU: unclearanced RB flywheel, 225mm disc, 215mm SS pressure plate.
FB: clearanced RB flywheel, 225mm disc, 225mm SS pressure plate.
GLC: super light flywheel, 215mm disc, 215mm stock pressure plate (heavy 8.5 pound)

The REPU will end up with probably about the same amount of total clutch grip as a stock setup, which I've always found to be adequate. Possibly even greater than stock, actually. I won't have to buy anything.

The FB will get full 225mm stuff, and will feel heavy with the 12A, but I also wanted to learn how to do J-turns, doughnuts (donuts?) and other fun parking lot maneuvers. Then when the 20B goes in it will feel just right and actually hold the torque for a while, even after break in.

And finally the GLC will get the super light flywheel because that is all that's left. It's only compatible with 215mm clutch components but that's ok. The GLC doesn't need anything bigger.

Hmm, it might actually be possible to use a 225mm pressure plate if I use the RB long bolt kit. The flywheel lip has three small clearanced cutouts. I'll know more once I have access to it. Otherwise it will get the heavy 215mm pressure plate I've had kicking around here for a long time. Most pressure plates weigh 8 pounds. This one weighs 8.5 pounds. It's not a lot, but hauling four people and groceries makes you think twice about some things.

[Jeff20B]

Here is a the super light flywheel. It only weighs 8 pounds.


Here are the two RB light steel flywheels. The one on the left is clearanced for 225mm pressure plate use. The one on the right only works with 215mm pressure plates.