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Triumph TR6 - clutch pedal pressure
|Should the clutch pedal pressure on a 1970 TR6 be pretty stiff to depress. My pedal seems harder to depress than a "normal" car feels. Anybody have any comments or concerns I should have on this?|
Way harder. Thats normal for the car.
Its why most TR guys have a springy walk on the left side..:)
|Now if we could get a harder throttle our legs would both look like popeye's arms. Yes, Bill is absolutely right. The TR4 and Tr6 have very heavy clutches.|
|Mostly true, Joel. But I have an early TR4 that feels just like a TR3. Probably because it is. I'm not sure when they changed to the diaphragm type instead of springs, maybe 4a? Just being nitpicky, sorry.|
|Robert-The complaint about the heavy pressure to operate the clutch did not go unheeded by Triumph. In 1970 the diameter of the clutch mas. cyl. piston was reduced from .75" to .70". This reduced the pedal pressure by about 15%. Unfortunately, it also reduced the movement of the slave cylinder pushrod and contributed to clutch release problems-any wear in the linkage or air in the hydraulics will prevent the clutch from releasing. The Moss catalog shows the change in master cyl. size took place at CC52952. The master cyl. are interchangeable and either one could be fitted to your car. So, the choice is yours, slightly reduced pedal pressure or slightly less clutch release problems.|
|Pedal pressure relief is also attainable by switching over to the 'Gunst' setup. This kit is now sold by TRF and includes a robust throw-out bearing mounted on a brass alloy carrier that slides on the gearbox extension. This setup produces less friction between the carrier and the extension and, voila, less pedal pressure to disengage the clutch. Some converts have reported a modern clutching action with the setup.|
|Rick O-I just re-read the Buckeye article titled "Reliable clutch" and Nelson tested the release pressures of the 3 available pressure plates and Sachs required significantly less pressure. In fact, when it was used with the Gunst setup, only 25 lbs. of pedal pressure was required. I don't know how much the Gunst bearing contributed. The only downside might be some clutch slip with increased hp.|
|Last year,I installed TRF's magic clutch with the Koyo bearing. I noticed a significant pedal pressure decrease. My engine rebuild this year included .100" off the head, GP2 cam, 1.65:1 roller rockers, etc. In other words, much greater horsepower. While I had it apart, I was not impressed with the amount of wear on the pressure plate fingers caused by the Koyo bearing, so I installed the Gunst bearing. No slippage is evident, but the pedal is now too light for my liking. So next spring, I plan on installing a NOS Laycock plate which I've aquired. There are a few combinations available, each one offering different pedal pressures. I think it boils down to a matter of preference. John.|
This thread was discussed between 24/11/2004 and 25/11/2004
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