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Beware of dual disc clutches
I almost installed a dual disc clutch on my car and changed to single disc last minute due to required modifications I was not comfortable with, like trimming the bearing retainer and shaving part of the bolt heads that hold the bearing retainer on the trans.
What they don't tell you on the phone (tech support) and in the descriptions, is that there are actually many draw backs to this setup. Only the paperwork that comes with it, has all these warnings: 1) It rattles 2) Should not be used in hot lapping 3) No engine breaking 4) No burning rubber in wet and then hit dry pavement, as it could destroy the clutch 5) Should not be used with taller gears than 4.10 (lower numerically) on dyno 6) Miss shifts will ruin the clutch 7) Always start in 1st gear 8) Rev match when downshifting for power, or it could damage the clutch 9) if you really want to race, upgrade to another high performance clutch they make. Among other installation modification that may be required depending on application. Although I don't know if this is an exaggeration so they don't get sued, it makes me uncomfortable putting one in my car. . . as it sounds to defeat the purpose of having a dual disc clutch. . . I just thought I would pass this along in case you're considering one. .. . . |
I was thinking of geting the Mcleod dual disc clutch kit. Don't?
John |
The draw backs I listed above "talked" me out of it. That being said, I am NO expert. . . ask them about the drawbacks above. . . . (most have to do with the metal anti-rattle straps for the metal piece between the discs that can get bent and make the clutch bind. . .)
I went with this setup intead: 12 inch race clutch Mcleod 260873 Pressure Plate: Mcleod 360821 Aluminum flywheel: Mcleod 563210 pilot bearing SKF B50HD pressure plate bolts ARP 150-2201 flywheel bolts ARP 200-2802 |
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Sounds like CYA to me. The main reason to go to a dual disc setup (with smaller diameters and a flexplate instead of a std dia. flywheel) is to reduce inertial mass....No point in keeping the same diameter (12") and going dual as that just increases the mass and kills performance. If done right a single plate set up will work for everything you could want on the street. I'd go with a sprung disc as it reduces the shock loads when shifting...makes driving a LOT easier. Badger
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Do my decision was reinforced. . . |
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Wow,it's been a long time since i've seen BS like this.There has been a Mcleod Street twin in my car since 1996 with no issues.
It didn't/doesn't rattle. I pounded the piss out of it and it still is fine. How in the hell can a missed shift ruin a clutch? |
If you wanna go racing get a single plate?
Wait a minute, I thought you got a dual disc BECAUSE you want to go racing??? Whew, is this ever confusing! |
Sounds like BS to me, virtually all the symtoms could equally apply to a single plate as well, given the right circumstances.
We had a twin plate that was fitted to the Aussie GT Falcon in the early 70's, if that was simply installed without careful measuring of finger heights etc it was useless, fitted correctly they gave few problems, yes sure it had a few rattles etc, but so did the rest of the car, it was after all as close as you could get to a road/race car at the time- just like cobra's. If you want quiet- no rattles etc then a cobra probably isnt what your looking for. I dont get it when people use the clutch for engine braking, isnt that what those big shiny round things behind the wheel spokes are for. ;) Jac Mac |
It is BS! The new Ford GTs use dual disc clutchs for a reason and it is reliability. All the 'it will break if you use it BS' would not set well with the accountants that have to project the warranty expense.:CRY:
Think about it. This question doesn't take rocket science to solve.:rolleyes: By the way none of the street twins including the GT rattle. :3DSMILE: The only thing that I hear rattling is particularily small brains in particularily big heads the act like BBs in a box car.:LOL: Come on get real ... |
You can call it BS if you'd like, but I got the warnings from the manufacturer's installation instructions:
email me if you want a copy of these I am NOT trying to bad mouth anyone, just give you guys a heads up and like I said, "Although I don't know if this is an exaggeration so they don't get sued, it makes me uncomfortable putting one in my car. . . as it sounds to defeat the purpose of having a dual disc clutch. . . I just thought I would pass this along in case you're considering one. .. . ." |
I read the Ram PDF file to which you provided a link. A few thoughts:
I am sure the McLeod single plate clutch will work fine for you. However, your "assessment" of and generalizations about twin disc clutches is probably going to rattle some chains on this site. |
I have been running a McLeod Street Twin for 3 years now.I have a small block,so I'm only putting 584 ft. lbs. of torque thru it.
I have not had one problem with it in these 3 years.There are several other guys in the DFW area w/Cobras,small and big block,that haven't had any problems AT ALL either. Maybe there is a difference between the RAM and McLeod units ??? |
Now things are becoming clearer.It's a RAM unit.McLeod has none of these issues.And yes,like someone else commented,the warnings have been taken out of context.
It would seem that they are saying that there is more loading on the clutch when you transition from the burn-out box to dry track than when the tires bite off the line and the front end points skyward?That is PURE BS. The Mcleod units are guarranteed to 9000rpm & 1400 HP.They are also adjustable to lighten the pedal pressure if you are running say .......500 Hp or so.That way both your legs stay the same size. I ran one of these behind my 455HO GTO and treated it like a red-headed step clutch.No issues-not even a hiccup. |
No disrespect to the poster, however, if you read any/most of his posts( usually questions) he has a desire to have a Cobra that is as refined as a Lexus. I am sure that you can build one that way....but the raw and un-fettered by government regulations thrill that IS a Cobra will be lost almost certainly. I believe early on when he first posted, someone suggested he get a new Corvette. I'm beginning to think that is probably a good suggestion. I deal with customers regularly that want me to build them a car "just like" they drove in high school. Unfortunately their tastes, and their experiences with newer cars, have changed. They are never happy with it "just like" their old car. I automaticly turn those jobs away now. If it has air bags or ANY govt. mandated crap, I don't want it and won't buy it. Maybe the Auto mfg.'s should get together while their business is sliding down the tubes and insist that the govt. allow them to offer cars without all that crap, as an option. All motorcycles have used multi disc cluch systems for decades ( I think a century to be more precise) with the exception of BMW. They may use them now.
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You're wrong about me and what I like and just to think I let you influence some of my past decisions. . . what was I thinking. . . There is no possible way to have a real tech conversation in here. |
RSIMOES-you have some what of a point.But your intial posting was a blanket statement and insinuated that ALL twin disc clutches have the issues you described.This is not true.
And despite a slight"desending grade",this has brought relevant info to light. |
Rob, I give the same level of advice to ALL persons that inquire, without considerations of their particular leanings. Sorry you were offended, but for the record I have said similar/same to some very good friends and relatives. They are still very good friends and, well, the relatives are stuck with me :)
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I read on my mattress tag that it was not to be removed under punishment of law...so I burned the tag. |
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