Increasing clutch cable transaxle pulley diameter Options

[HalfMoon]

Has anyone ever experimented with increasing the diameter of the transaxle clutch cable pulley?
Obviously the housing would have to be modified that much goes without saying.
My wondering on this idea would be to shorten the "throw" at the pedal with the hope of increasing shift speed (I've converted to a cable shift).
Direct experience with this modification very much sought.

[mb911]

An eccentric wheel would do what you are looking for. It's not a bad idea

[HalfMoon]

An eccentric wheel would do what you are looking for. It's not a bad idea

Similar to the 944 "lobe" mentioned earlier in the thread?
I suppose that was what I was wondering about initially, the idea that the pulley could somehow make an affect on the "throw". I was remiss in explaining my thoughts more thoroughly.

[Superhawk996]

An eccentric wheel would do what you are looking for. It's not a bad idea

Similar to the 944 "lobe" mentioned earlier in the thread?
I suppose that was what I was wondering about initially, the idea that the pulley could somehow make an affect on the "throw". I was remiss in explaining my thoughts more thoroughly.

I'll apologize upfront for being a engineering dork. Let's stop calling things a pulley that are not a pulley. A lobe is not a pulley. A cam is not a pulley. A lever arm is not a pulley.

What you are proposing then is to build a lever arm in the physical location that the transmission pulley curretly occupies.

However, the conservation of energy always applies. There is no free lunch.

So now all you are doing is adding another lever in the middle of the system which will have the net effect of increasing travel on the transmission clutch lever & thowout bearing side while decreasing the travel at the clutch foot pedal. In exchange for that, the forces at the clutch foot pedal will go proportionally higher.

Why not just adjust it at the foot pedal ratio where the motion is initiated?

Per the 911 clutch lever that Bdstone914 posted, you will get exactly the same net effect, More travel of the cable, and higher clutch pedal forces. Yes, that clutch pedal lever arm change seems small but in order to get significantly more travel, you'll just keep increasing the clutch pedal force to get more cable travel regardless of whether that occurs in the front (at the pedal) or at the rear tranmission lever that you propose adding.

Faster shifing is rarely achieved by increasing clutch pedal force.

I apologize if I'm coming off as combative. That is not my intent. Just trying to reiterate that any proposed change to the system comes at the expense of something else (i.e. pedal forces increase proportional to cable travel increase that you're seeking).

FYI -- you could also get the same net effect by shortening the length of the clutch thowout bearing arm where it exits the transmission housing. A shorter lever arm there will decrease the overall travel needed from the system but will have the same net effect -- higher clutch pedal forces.