bullstarz
Full Member
I don't believe in miracles, divine intervention or good luck............. I rely on them.
Posts: 135
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Post by bullstarz on Apr 2, 2021 17:45:21 GMT
The clutch on my car is a Tilton 7 1/4 triple plate affair, and these clutches are pretty much on or off. Which can make pulling off a bit, well I don’t think there is words that describe it really. Tilton say to use a .75 master cylinder for the clutch.
Now here is the question or puzzle and I’m very interested if anybody’s got any knowledge or experience, so as the car is part strip down I can do some swapping about.
I’ve done a bit on hydraulics and got a bit of knowledge on physics, and from my reckoning it should work, but more than likely won’t. But I’m thinking of doing is swapping out the 0.75 Master cylinder and swapping it with a 0.7 or 0.625 cylinder.
Doing the maths, as far as I’m concerned the difference will be 15% or 44% respectively. So this should mean that the clutch pedal will be 15% or 44% easier to press. As a consequence of swapping to a smaller master cylinder the amount of fluid pushed to the clutch will be reduced by the same amount.
The clutch should, in principle, still function but to make it work you’d have to press the clutch pedal by 15% or 44% further for it to do so. With the 0.75 master cylinder there is a very small movement of the clutch pedal, between the clutch disengaged and fully engaged. This should also be increased by the same amount. As a result there should be more control of the bite of the clutch.
I’m fairy (but not 100%) sure my reasoning is correct but I may be completely barking up the wrong tree, and let’s face it it wouldn’t be the first time.
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Post by Flying Farmer on Apr 2, 2021 19:21:19 GMT
Sounds reasonable. The problem with the normal Stag clutch is getting enough movement, on my estate I had to redrill the pedal to get a bit more stroke (though the pedal sat too low relative to the brake anyway)
I reckon the choice of master cylinder will come down to how much stroke you actually need to operate the Tilton clutch, and how much the cylinder can actually provide, then working out the amount of stroke you can comfortably achieve with the pedal
Neil
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Post by mrtempler on Apr 3, 2021 0:32:04 GMT
I don’t kntow if I should really post but I have no idea what the two of you are going on about. However it s very, very very, strange that someone should agree with something on a website. That is pretty mental. Especially where is to do with a Triumph Stag.
Surely if it still works then why would you want to change it. If it didn’t work properly and is an easy fix and do it. But otherwise just enjoy the car especially in this lovely hot warm sunshine whether we are getting at the moment.
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Sapphirestag
Full Member
Letting your tyres down at the moment. I was also a target of the Fiefdom controlling the SOC forum
Posts: 129
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Post by Sapphirestag on Apr 3, 2021 12:29:56 GMT
I don’t kntow if I should really post but I have no idea what the two of you are going on about. However it s very, very very, strange that someone should agree with something on a website. That is pretty mental. Especially where is to do with a Triumph Stag. Surely if it still works then why would you want to change it. If it didn’t work properly and is an easy fix and do it. But otherwise just enjoy the car especially in this lovely hot warm sunshine whether we are getting at the moment. It's not a standard set up. Bullstarz car is highly modified. Not sure what gearbox but the engine is a Lexus V8. His point is the current set up is engaged or disengaged and minimal in between, its just further development of the project.
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bullstarz
Full Member
I don't believe in miracles, divine intervention or good luck............. I rely on them.
Posts: 135
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Post by bullstarz on Apr 6, 2021 22:16:31 GMT
I think the changing of the clutch master cylinder maybe something I could do, but I think I put on the back burner for a bit. today was a decent time to change the front pads, which will hopefully alleviate the poor brakes. The pads were standard Wilwood pads which seemed a bit wooden from cold, they got better as they warmed up but the initial cold bite was a bit poor. Spoke to EBC about the best pads for the car, they said green stuff wouldn’t be good enough, the red stuff is too light weight for the car, yellow stuff would be good, but the blue stuff it’s just better again in every aspect. So I fitted a set of EBC blue stuff, which have just become road legal. we’ll see what they’re like. Thought it would be good time to flush the braking system with new fluid, as it must be getting on for 3-4 years old. It took a while to get fluid without any bubbles. So there may have been a little bit of air in the system, which obviously would’ve made the brakes very poor. Tried a different way of bleeding the brakes, I do have a vacuum bleeder that works off of compressed air. Only issue with that I’d loaned out my air compressor. So used an electric pump, to draw Fluid out of the bleed nipple, seemed to work quite well, especially doing it on your own. It’s an awful lot easier than using those bleeders with a one-way valve to stop the backflow, or using the old tactic of press and hold the break pedal, while someone else cracks the nipple, then does it up.
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