FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: ron b on May 30, 2018, 06:34:44 PM
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I am looking for the best long style pressure plate and disc for a street / strip application. haven't ran a street /strip clutch in a while, I have been running a tim hyatt soft loc. I want to go to the cj 50th with the car and don't want the pro shifted trans and soft lock in it. thanks ron
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McLeod and RAM both have very high quality clutch kits in a 1-3/8"x10.
McLeod does not make an 11.5"/12" Long pressure plate anymore, but RAM does. Depending on your horsepower rating and bellhousing, you may not even need an 11.5/12" plate any way...a lot of the 11" clutch kits will hold their own and put less weight on the end of the crankshaft.
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If you are not going to race, I can understand not wanting a "pro shifted" trans, but I would still use the soft-loc... why not? On my brothers 95% street driven car, he has a soft-loc and it works just fine. I put 13 grams of counter-weight on each lever and 7 turns of base and he has been driving it like that for over 5 years, no issues in a 69 Mach 1 with 750 HP. My car is 95% race and I had the same amount of counter weight on my old soft-loc, with 2 1/2 turns of base and that worked for 1.33 60' times and stayed locked up in high gear at 3540 pounds going over 140 MPH in the 1/4. If your engagement is short then play with your bell crank lengths and get more leverage (slow it down) for more control at the pedal. I've driven mine on the street too, no issue other than without a bunch of counter-weight it will slip if you try and get on it at a low RPM.
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My Soft Loc from Hyatt is turned all the way up for street , haven't had any problems 5 years running now
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I have a another car that is not a original scj car that I am going to run the soft loc in.
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This is my opinion of "the best". If you call and talk to them they will shave back the diaphragm fingers to allow a 1-3/8" input shaft.
https://www.mcleodracing.com/index.php/clutch-kits/rst-twin-disc/rst-clutch-pns-9987.html
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McLeod offers both pressure plates with the fingers cut already for the big input. It's just got a separate part number.
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It should be noted that some of the 1-3/8ths dual disc offerings from McLeod MUST be utilized with hydraulic T/O bearing. Perhaps the OP has a hydraulic bearing already for the vehicle in question so the concern is moot but Brent and I went through this with my Fairlane.
JB
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It should be noted that some of the 1-3/8ths dual disc offerings from McLeod MUST be utilized with hydraulic T/O bearing. Perhaps the OP has a hydraulic bearing already for the vehicle in question so the concern is moot but Brent and I went through this with my Fairlane.
JB
Can you elaborate on this? There are 3 of these stacked up in the mezzanine of our shop. One for my Galaxie, one for our '67 Mustang, and another for our '65 Galaxie. Got a quantity discount on them. McLeod didn't say anything about this when we got them, could throw a wrench in things. They are all diaphragm style.
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It should be noted that some of the 1-3/8ths dual disc offerings from McLeod MUST be utilized with hydraulic T/O bearing. Perhaps the OP has a hydraulic bearing already for the vehicle in question so the concern is moot but Brent and I went through this with my Fairlane.
JB
Can you elaborate on this? There are 3 of these stacked up in the mezzanine of our shop. One for my Galaxie, one for our '67 Mustang, and another for our '65 Galaxie. Got a quantity discount on them. McLeod didn't say anything about this when we got them, could throw a wrench in things. They are all diaphragm style.
He's talking about the RST/RXT twin disc for the 1-3/8"x 10 input shaft. Won't work with a traditional fork/TOB.
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It should be noted that some of the 1-3/8ths dual disc offerings from McLeod MUST be utilized with hydraulic T/O bearing. Perhaps the OP has a hydraulic bearing already for the vehicle in question so the concern is moot but Brent and I went through this with my Fairlane.
JB
Can you elaborate on this? There are 3 of these stacked up in the mezzanine of our shop. One for my Galaxie, one for our '67 Mustang, and another for our '65 Galaxie. Got a quantity discount on them. McLeod didn't say anything about this when we got them, could throw a wrench in things. They are all diaphragm style.
He's talking about the RST/RXT twin disc for the 1-3/8"x 10 input shaft. Won't work with a traditional fork/TOB.
I'm going to need to look into this. The one's we have are the RST. Talked to McLeod at SEMA a few years back (maybe SEMA 2016) because at the time they didn't make the RST for a 1-3/8" input shaft. They decided to use their CNC plasma and cut the fingers shorter for us. At the time we thought we were getting a one-off deal so we had them do 3 in case they decided it was too much trouble to ever try again. Looks like since then they've decided to make a standard part # for it. Through the whole process nobody said anything about a different throw out bearing though.
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What is it that makes it hydraulic throw out only? I'm assuming the pressure plate is deeper to allow for the twin setup, which doesn't allow enough room for a fork?
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I did not receive an explanation from McLeod, just that a traditional T/O bearing arrangement would not survive even minimal use. I got lucky only in the sense that I noticed one finger on the diaphragm was a bit proud after I installed the clutch. So I called McLeod to ask if it would settle out and tech said no worries but in the course of the conversation I asked if their T/O bearing was a good match and tech tells me I can’t use one. Huh? So it all comes out and goes back to McLeod for a refund. Now just imagine if I put the drivetrain completely back together and it instantly turns to shit. That was the lucky part if you want to call it that,lol..
I was very excited about the twin disc set-up but all for nought. The next joke was trying to find a street clutch for my big I/O TL that is rated for 600 hp. Not much to choose from out there. Good luck!
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I did not receive an explanation from McLeod, just that a traditional T/O bearing arrangement would not survive even minimal use. I got lucky only in the sense that I noticed one finger on the diaphragm was a bit proud after I installed the clutch. So I called McLeod to ask if it would settle out and tech said no worries but in the course of the conversation I asked if their T/O bearing was a good match and tech tells me I can’t use one. Huh? So it all comes out and goes back to McLeod for a refund. Now just imagine if I put the drivetrain completely back together and it instantly turns to shit. That was the lucky part if you want to call it that,lol..
I was very excited about the twin disc set-up but all for nought. The next joke was trying to find a street clutch for my big I/O TL that is rated for 600 hp. Not much to choose from out there. Good luck!
I looked into this over the weekend. McLeod sent us throwout bearings with the clutches. Sent them all together. They're all on one invoice. Ours are the diaphragm style, not the long style. Wonder if that changes things?
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All RST/RXT kits have diaphragm plates.
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Alright, I just called McLeod to get this all straightened out (slow day at work ;D).
The problem with the 1-3/8" input transmissions is the collar around the input shaft is roughly 1-3/4" around and the diaphragm fingers are roughly 1-1/2" apart. So the collar interferes with the diaphragm fingers. They tell you to run a hydraulic throwout bearing so you can shave the collar back and retrofit the hydraulic throwout bearing to the transmission.
The modification that McLeod did in my case was shave the last bit of each finger off. They were able to do this because the high point of each finger was still maintained once the fingers were clearanced back.
This is still a custom order scenario, they do not have a part number for an RST or RXT with the fingers shaved back in this same fashion.
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So if they modify the fingers can you run standard T/O or must there still be a commitment to hydraulic? Either way it is ridiculous IMO.
JB
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So if they modify the fingers can you run standard T/O or must there still be a commitment to hydraulic? Either way it is ridiculous IMO.
JB
Yes, when they modify the fingers, it allows you to fit the input shaft collar through, which holds a standard throwout bearing. I'm not sure how happy McLeod is to offer the service to people. We just happened to run into one of their engineers at SEMA and BS'ed with him for a while and he kind of took it on as a personal challenge.
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Alright, good to know. So there could be a McLeod dual disc in my future after all provided they would “tune” a cover plate for me.
Thanks,
JB