Quote:
Originally Posted by Big D
Hi Malcolm,
That would be the restoration of my M8 you have seen. Has the clutch on yours ever worked properly?
I to was surprised at the size of the hydraulic tubing for the clutch. As you are probably aware, the clutch slave cylinder on the M8 is quite chunky, and quite a bit bigger than the slave cylinder for the throttle. The throttle uses 3/8" hydraulic tubing though so with the lines on your clutch being even smaller than that at 5/16" doesn't seem quite right. Perhaps the line size simply doesn't allow sufficient volume of fluid to be pushed through to activate the slave cylinder?
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Darryl, yes, it was that thread on your very nice restoration I was referring to. I drove the M8 a few years ago and my recollection is it drove ok, so I think something has deteriorated.
When I saw your reference to 1/2" tubing, I said, that can't be right. I've NEVER seen 1/2" tubing on an "automotive" braking or clutch system. But the parts list confirmed it.
I can see no advantage to using tubing that large in this application. I used a pressure bleeder applying only 15 psi to the m/c reservoir and when I cracked the bleeder on the slave cylinder, I got a FOUNTAIN of fluid coming out. So 5/16" tubing seems to be quite adequate for good flow. And it's not like the tubing causes a hard pedal from squeezing fluid through restrictive tubing. The pedal effort is very light.
I did some measurements on the m/c and slave cylinder. The m/c pushes out 20 cc per stroke. The slave cylinder needs 25 cc to go its full stroke of 1 1/4". So the slave cylinder is stroking 1" when the pedal is floored. Now I need to confirm that I am getting 1" movement of the slave cylinder rod and also if 1" movement is enough to fully disengage the clutch plates.
Malcolm