Do Clutch Plates and Pressure Plates Have to be the Same Diameter? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-20-2009, 06:55 AM
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Do Clutch Plates and Pressure Plates Have to be the Same Diameter?

This is probably a silly question, but fundamental I suppose.

Does a clutch (driven plate) have to be of the same overall diameter as the friction surface of the pressure plate, or can the clutch plate be slightly smaller? I.e., could a 9" clutch plate be mated to a 10" pressure plate, or would they be incompatible?

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Old 03-20-2009, 07:30 AM
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Quote:
Originally Posted by mrwumper
This is probably a silly question, but fundamental I suppose.

Does a clutch (driven plate) have to be of the same overall diameter as the friction surface of the pressure plate, or can the clutch plate be slightly smaller? I.e., could a 9" clutch plate be mated to a 10" pressure plate, or would they be incompatible?
In theory, yes, but the real answer is, it depends. The problem is the actual inner and outer diameters of the pressure plate and the friction surfaces on the clutch disk. At best, you'd have significantly less contact area (and thus less holding power) and at worst, you'd have a mechanical interference.
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Old 03-20-2009, 12:35 PM
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clutch disc sizes.

YES, it can. Years ago, I bought a new, fleet style, 74 Chevrolet Nova. 250 6 cylinder, bolt action 3-speed, 3.08 rear gears. Steep gears, and the clutch wore out fast. When I took it apart, doing the clutch job, it had a 10.4" diaphram cover, and a 9" disc. I replaced it with the 10.4 disc. Vegas and Monzas came that way also.
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Old 03-30-2009, 12:43 AM
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Bolt action.

The 9-1/8" that came in my 6-cylinder '69 Nova used the same pressure plate as the 10" clutch that 307 cars came with. Easy upgrade. The 10-3/8" clutch found in 327-350 cars had a pressure plate with a larger inside diameter, which is probably why junior stocker's wore out so fast. All three sizes would fit on the same flywheel, so I put the 10-3/8" setup on mine. Had to get that 2nd-gear scratch, ya know.
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