If the friction surface on his flywheel is 8 inches across he needs
another pressure plate and disk. There are (I think) three friction
surface diameters for L/Z series Datsuns with the same flywheel
overall/ring gear diameter. The Roadsters and 4-clynder sedans use the
same diameter pressure plates and disks but different flywheels.
The Roadsters and L-4 sedans used 200mm while the L-6 (Z & 810) used
225mm and 240mm (Z 2 +2, I think). IIRC, most of the pickups used the
240mm units along with big heavy flywheels and low (mid 4.something to
5.something) rear gears.
The heavy duty Roadster pressure plate, commonly referred as the 20111
(the last 5 numbers in the part number), has long been used on the
L-4s that use the 200mm flywheel. It's much stiffer than the OEM 510
PP and somewhat more so than the OEM roadster unit. The clamping
pressures are available but I don't know them off the top of my head.
You'll really give your left leg a workout using the 20111 in either a
roadster or 510. At the other extreme the OEM 510 PP was good for
maybe 30K miles of "normal driving" in a 510.
If you decide to order the "heavy duty" unit from anyone including a
dealer check the number of rivets on the tabs holding the assembly
together. True 20111 units will have three rivets on each tab. If it
only has two it's not a real (20111) pressure plate. I'm not sure how
many, if any, of the 20111s are still available. I picked up a couple
along with a bunch of other stuff in the early '90s anticpating
building up a couple of 510s. I'm finally getting around to using some
of this stuff.
Ron
> Daryl Smith
> Funny, I was just up at Garth's place where he was trying to get his
>clutch/flywheel balanced. They turned him away because the new roadster clutch
>didn't match the flywheel which was taken off his car.
>
> The old pressure plate bolted on right at the edge of the flywheel (10 5/8"
>bolt centres), clutch is 8 7/8" (225 mm) diameter.
> Googled the part #s and it turns out it is for the L20B, Z20, L20ET, or the
>SD20 diesel.
>
> Very heavy duty compared to the roadster clutch.
>
> Was this an old racer trick? Would be kind of heavy, but it sure wouldn't
>slip.....
>
> Or just someone making something fit just because they thought it was better?
>
> 'Course Garth now has to find a replacement for the flywheel to keep
>everything 'Roadster'.........
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