Jack,
Per Kas Kastner in the TR4 Comp Prep Manual:
"The diaphragm type clutch was introduced with the TR4A. This unit has a
8.5" diameter and is highly recommended for both the TR3 and the TR4.
This unit has been used with great success in cars prepared by the
COmpetition Dept. with horsepower figures in the high 150's. This clutch
was used in the TR4A cars entered in the Sebring 12 hour race in 1966
with fine results as the cars won the class 1, 2, 3, and also won the
team trophy.
When fitting the diaphragm clutch to the TR3 or the TR4 it will be
necessary to redrill the flywheel as, of course, the bolt pattern of the
smaller clutch is different. With early TR3 models, it will also be
necessary that the later type starter be used. The early type starter is
too long and will foul with the bell housing if the later type TR4
gearbox is used.
My own experience doesn't include this clutch. But, with a hydraulically
assisted clutch, I doubt you will feel much difference.
Alan Myers
San Jose, Calif.
TR4 #CT17602
Jack I. Brooks wrote:
> Can anyone compare the clutch action and engagement differences on the
>
> TR2-4 and TR4A-6 clutches.
>
> I am looking at the benefits of installing a diaphragm (TR4A-6) clutch
> in
> my TR3A. The swap is not difficult, I believe the only differences
> are the
> pressure plate mounting hole location and the release bearing sleeve
> length.
>
> Is one easier to engage well, easier to compress, stronger? What are
> the
> major differences you see/feel from the drivers seat?
>
> Thanks,
>
> Jack
--
MZ
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