Originally Posted by Jennifer 2

On a hot day, with a little hydraulic fluid expansion, some Zs have had the pedal stick in the down position, there a few causes for this, but the fact that the diaphragm spring comes close to an over-center situation contributes to this malady.

Originally Posted by Jennifer 2

Bmcmvox, Go7roo7, et al, there is a little skill and experience involved here. You must learn where the complete disengagement point is and be able to push the clutch pedal just a bit past that point on a repeatable basis. (Obviously if you don’t push it far enough the gears will protest) If you feel safer bottoming out the pedal with every shift though, go for it.

Winchman you’re reaching pretty hard here to find some possible theory to prove a point. I doubt you’ve actually seen any measurements on this. In practice, the pressure plate can only travel a set amount to where diaphragm spring flattens out and approaches the over-centering region. At this point the spring/fulcrum geometry changes and that extra push on the pedal doesn’t do much. On a hot day, with a little hydraulic fluid expansion, some Zs have had the pedal stick in the down position, there a few causes for this, but the fact that the diaphragm spring comes close to an over-center situation contributes to this malady.

I’m not an auto technician or engineer, or even a fan of working on cars. I was my dad’s conscripted helper though, when he adapted all new transmission internals and clutch operating linkage (including mapping out the clutch and pedal link geometry for my first sports car. Vintage MGB’s didn’t feature any synchromesh for first gear. He machined and installed one, as well as modernizing the others.

The last inches of pedal travel on a Z don’t actually provide much extra plate movement. Drag racers have actually measured the travel and have installed pedal stops to provide faster and more precise gear shifting without damaging anything. RJM performance, a vender here, makes and sells a adjustable pedal bracket that lets you dial in this and more. It greatly improving the clutch action, and by extension also the shifting action, I think it has received great reviews.

Originally Posted by justin60222

How long have you been driving stick?

Originally Posted by kingdom

I have the RJM adjustable clutch pedal, and after reading this thread im going to go home and adjust it.... When I first put it on, I had the clutch friction point about the same as stock. Then over time adjusted it lower and lower to the floor. This was based off preference but now im afraid it may be too low.

Originally Posted by bmcmvox

Yeah, they are on sale now too. Was eyeballing them yesterday. Problem is, install looks a little intense judging by their pics. I am a little hesitant to bite off more than I can chew.