clutch master cylinder

[dsrace]

ok guys I need some info before I buy a new set of pedals. now I know dunebound69, enemy and now fabbr and transman can back me up on this one. I have a slave cylinder 19mm from speedway motors because the one that came with the jamar ( aka POS ) pedals was no good and not the 3/4" bore they claimed when I got it. now I believe I have an 11/16 bore clutch master cyl, with my 19mm slave and the weddle throw out arm lever which is 1/2" taller than stock with a new return spring from weddle! stage III 9" (228mm) clutch throw out arm shaft rides in an oil impregnated bronze bushing also from weddle. my clutch is as hard as a rock, after a few days of sitting I can get in and no pedal till I pump it a twice but I have no oil leaks!  what would be the appropriate size for this configuration? any thoughts on how I could be getting air in with out oil coming out?

[dsrace]

also the clutch line is stainless steel braided teflon core 1 piece an 4!

[SPEC]

Bad o-ring on one of the pistons?

[Carlriddle]

Just clean out all the fluid, that thing so hard someone may have slipped in 2 viagra.   Do the brakes work?

[fabr]

What are the stock master and slave bores?

[fastcorvairs]

also the clutch line is stainless steel braided teflon core 1 piece an 4!

Although -4 will work.  You should have -3.  You mite be getting some xspanchion (spelling) in that large of line. the slave could be bypassing some of the hyd fluid.

[fabr]

I'd agree with -3 being better but the pedal effort is also VERY high on his clutch.

[fastcorvairs]

I'd agree with -3 being better but the pedal effort is also VERY high on his clutch.

With the extra length on the arm it should be softer. How did they make your stage three clutch?  Did they double up on the fingers in the clutch and call it a stage three?  Or are the pressure plate fingers extra heavy duty?  If they doubled up on the fingers that could be some of the hard pedal.

[fabr]

I think it's a ratio issue. Seemed pretty short pedal travel to me especially with a longer arm at the trans.

[dsrace]

Just clean out all the fluid, that thing so hard someone may have slipped in 2 viagra.   Do the brakes work?

ya brakes work

[dsrace]

What are the stock master and slave bores?

I don't know what stock is but I'm running 11/16 master and 19mm slave.

[fabr]

I'm taking a wild guess but I think it's a ratio issue and if we knew the stock sizes we could calc a good match.

[dsrace]

I'm taking a wild guess but I think it's a ratio issue and if we knew the stock sizes we could calc a good match.

stock is cable! I don't know the stock master bore though.  I know when i used the slave that came with it which was about 5/8" bore it was alot stiffer!  it has been getting worse though throughout this year! dunebound has the same clutch, his pedal is 1.5' taller and he also has the same throw out arm lever but single master and doubles on the brakes. he is hard lined back to the slave also so I am going to try that.  now according to jamar I got the high ratio pedals but that's bs since dunebounds are jamar and the highest ratio! they also said i got the 3/4" bore brake master and 11/16" clutch master when they shipped out and that was a lie as well!!         if I go hard line going 3/16" steel. anyother suggestions?  I wonder if kennedy has any info since they are the ones that sold me the clutch?

[fabr]

I should have said what is the customary sizes used when converting to hydraulic. There just has to be a ratio mismatch somewhere in the system.

[LiveWire]

You need a longer foot pedal, a longer lever at the clutch, a bigger slave cylinder or a smaller master cylinder. The distance from the pedal pivot to the master's lever could also be reduced to increase your leverage. According to something I read on the Goodridge site once, hard line will not help you. A stainless braided lines is supposed to expand less than standard 3/16" hard line. AN3 lines would be better than AN4, but the negative result of the AN4 would be a spongy pedal and not that it is hard to press. A longer foot pedal and smaller master cylinder would both increase line pressure which could potentially start making it feel spongy as the higher pressure makes things stretch. A bigger slave and longer lever at the clutch would reduce line pressure.

Although I used it very little professionally, I have certificates as a hydraulic mechanic and hydraulic technician.

In theory, a cable system would be replaced with equal sized master and slave cylinders. That would be if the lever ratios at both ends were also maintained. Since the pedal is not the original pedal, that changes things. The ratio of the overall pedal length to the distance from the pivot to the master cylinder push rod would have to be the same ratio as stock.