rdodger
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| posted on 19/5/13 at 12:19 PM |
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Heavy clutch
I drove my car for the first time today  Just up and down the drive but enough to find the clutch pedal is still too heavy.
It's MX5 engine with the standard 3/4" slave cylinder. The master cylinder is .625" (5/8" which is as small as you can get I
believe?
The clutch is the problem I think as it's a Exedy uprated effort.
As I see it I can
Reduce the size of the master cylinder. (can't find a smaller one)
Lengthen the clutch arm in the gearbox and space the slave cylinder. (would be a pain as I would have to take the engine out)
Change the slave cylinder. Would I need that to be bigger than the current one to reduce the pedal effort?
Cheers
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gremlin1234
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| posted on 19/5/13 at 12:37 PM |
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one other way could be to connect the master closer to the pedal pivot point.
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britishtrident
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| posted on 19/5/13 at 12:57 PM |
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Unlike brake systems a clutch master cylinder has to pump a considerable volume of fluid to get the clutch to clear the flywheel.
Before changing part check the pipe work isn't constricted, with braided hose check the fluid is flowing freely through it as it no unknown
for the end fittings not to be properly drilled through.
ISTR The MGB slave cylinder has a bore of 1.25" and may adapt to the Mazda mounting.
However as gremlin1234 has posted I think the best approach will be to re-engineer the pedal end.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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rdodger
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| posted on 19/5/13 at 05:16 PM |
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Thanks guys.
Yes you were both right, it was easier to drill another hole in the pedal and increase the pedal ratio.
Considering that the Exedy clutch is pretty harsh it's worked very well.
Not luxury saloon but at least I won't cry if I hit a traffic jam!
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adithorp
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| posted on 19/5/13 at 06:17 PM |
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I've seen reports of people using BUSA rear GSX 1300 R 99 - 07 Hayabusa Rear Brake Master Cylinder | eBay when they
needed smaller diameter clutch cylinder.
Think they're 1/2" or 12mm. That'd give you a lighter clutch but it'd be "longer" as well but thats going to
happen however you do it.
Also they're not mounted in the same way so you'd need to make some sort of bracket.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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