You Asked For It!!

[South Bend Clutch]

Well we did it... "A street double disc" Do to the many request. #ad




You can get this in any plate load we offer...



3250 lb

3600 lb

3850 lb

4200 lb



This clutch is not recommended for sled pulling but will offer an altra smooth feel for a DD clutch that will be able to hold some serious power.



Peter

 

[RHARVEY]

Peter. .



You need someone to help with testing on one of these bad boys???? .

What kind of trade in would you give me for a 1/3 used 13" upgraded Con OFE????



Rick

 

[RWood]

What are the major differences, especially the diferences with the disks? And how does the price relate?

Thanks

 

[HeavyHauler]

Awesome Peter! That is next on my list! I think I'm stretching the limits of the 13" OFE right now - or I will be soon anyway.



I would assume that this version wouldn't be as hard on the transmission too, right? Any differences in what kind of power they will hold?

 

[JCleary]

Awesome Peter! That is next on my list! I think I'm stretching the limits of the 13" OFE right now - or I will be soon anyway.



I would assume that this version wouldn't be as hard on the transmission too, right? Any differences in what kind of power they will hold?

I think all dual disc clutches are hard on the transmission. They don't have any damper springs, so the engine's spikes are delivered straight to the input shaft. Peter told me to change the oil often with a dd, like every 15k. There is also additonal rotating mass that the synchros have to speed up/slow down every shift.



Nobody can give me an answer on how much wear/tear it adds over a single disc.

 

[HeavyHauler]

I think all dual disc clutches are hard on the transmission. They don't have any damper springs, so the engine's spikes are delivered straight to the input shaft. Peter told me to change the oil often with a dd, like every 15k. There is also additonal rotating mass that the synchros have to speed up/slow down every shift.



Nobody can give me an answer on how much wear/tear it adds over a single disc.

I realize this, but I assumed that with this being a "street" version, it would not be as rough on transmission components as an all-out pulling clutch. I'm not an engineer and don't know the science behind these things - I'm just using common sense here. If they weren't a more "friendly" clutch as far as component wear, then why would they even bother producing them? The current DD is not problem at all to operate in my opinion - even those with the heavier plate loads.

 

[Bpostel]

SBC... When and if will you offer a triple disc clutch?

 

[Got Smoke?]

I realize this, but I assumed that with this being a "street" version, it would not be as rough on transmission components as an all-out pulling clutch. I'm not an engineer and don't know the science behind these things - I'm just using common sense here. If they weren't a more "friendly" clutch as far as component wear, then why would they even bother producing them? The current DD is not problem at all to operate in my opinion - even those with the heavier plate loads.

Hans he was correct in saying that these DD's will still add a good deal of stress to the transmission because they do not have sprung hubs to absorb the shock. From my minimal knowledge of DD clutches I would say these will engage easier than a "Pulling DD" because of the solid continuous material around the disk. Anything clutch disk that has there material in "puck" form around the disk tends to be a little grabby.



If you still want to shift fast I would suggest going to a 13" FE before a DD. Even though these new clutches will be more streetable than the "pulling type DD" they still will shift a little slower. I miss being able to flat out SQUASH opponents in red light to red light battles, but I don't worry about my clutch when hooking to a sled anymore.



I flat out LOVE my SBC DD, Peter builds and awsome clutch and I'm glad to have his product in my truck! Oo.

 

[HeavyHauler]

Hans he was correct in saying that these DD's will still add a good deal of stress to the transmission because they do not have sprung hubs to absorb the shock. From my minimal knowledge of DD clutches I would say these will engage easier than a "Pulling DD" because of the solid continuous material around the disk. Anything clutch disk that has there material in "puck" form around the disk tends to be a little grabby.

Mark - good grief, that's exactly what I conceded in my previous post. I know they're gonna put excess stress on the transmission, I was just speculating that they wouldn't be as rough as an all-out pulling clutch. And if you're description of the composition of the clutches is correct (which I'm sure it is) then I'm probably right. This was just a simple statement that got picked apart.

If you still want to shift fast I would suggest going to a 13" FE before a DD. Even though these new clutches will be more streetable than the "pulling type DD" they still will shift a little slower. I miss being able to flat out SQUASH opponents in red light to red light battles, but I don't worry about my clutch when hooking to a sled anymore.

Mark, you've seen my shifter - my days of fast shifting are over. I couldn't care less if this thing shifts like a Corvette or not.

 

[Got Smoke?]

Ok basically it boils down to this unless Peter introduces some new info I don't know.



The unsprung hubs is what causes all the stress to be put on the transmission Hans, that clutch still doesn't have sprung hubs. Everything else is still the same, the same floater plate & pressure plate. There is nothing there to make the stress on the transmission "easier". The only thing I see that these will have over a "Pulling DD" is easier engagement.

 

[HeavyHauler]

... and the less harsh/easier engagement will make it easier on transmission components!



Man I have bad luck with clutch threads.

 

[Dakotahaulers]

What about the prices and do we have to upgrade the hyd. system. I have roasted my stock clutch willl the #10 plate and I need a new cultch bad.

 

[MMeier]

How would this new one behave in a heavy towing enviroment? Say 25-32k # with around 425 Hp on a regular basis in a mountainous area?

 

[South Bend Clutch]

Yes DD clutches are harder on transmissions do to the solid hubs but HH is right about engagement... the smoother the better. This clutch is to be used where a single disc can no longer do the work. (super heavy hauling or over powering or high power with heavy hauling)



Sorry, I can not give pricing on the forms but it will be a little cheaper then the button styles because the cost to build is a little less.



Peter

 

[rubberneck]

FINALLY. Peter, I have been waiting years for this. My mcleod is on its last leg. You rock. Phil

 

[rubberneck]

pedal feel

Peter, which pressure plate will provide approximately stock pedal pressure? thanks phil

 

[rubberneck]

For you guys worried about the wear/tear on the transmission. I ran a con FE for the first 30k miles I had my truck and now have run a mcleod DD street for the last 65 K I notice no more material on the magnetic plug i have, nor does the oil look to have any more soft metals than it did with the single disc. I drive hard, and a single disc did not do what i needed it to do. If you are at this HP level, I just dont see a little extra wear being an issue. Lets face it we are putting well more than double the Hp through the trans as is. If we break it, should we really be that surprised or upset? Plus do you really hear about many trans going belly up after a DD was installed. And what were the circumstances? Probably sled pulling, and news flash, you are going to break parts doing that.



As far as shift quality I think you will be surprised. The sled pulling clutches are slow due to the huge weight of the 2 metal lined discs. I am guessing Peters clutch will shift a lot like the mcleod. True you have 2 discs, but they are an organic type facing which is going to be much lighter. And remember that a single has the rotating mass of the sprung center hub. My mcleod, does not feel much slower than my COn FE did. I would be willing to bet that the FE single disc was almost as heavy as the 2 organic singles together. My guess is this new one will also be very quick for a DD

 

[South Bend Clutch]

Peter, which pressure plate will provide approximately stock pedal pressure? thanks phil

Our 3250 lb is about the same as the stock clutch pedal effort.



Peter

 

[rubberneck]

Just ordered mine. 3600lb plate per my discussion with peter (you da man) Cant wait to put this baby in. . Christmass just came early. Dont tell my wife :-laf

 

[Woodenhead]

So this clutch will hold more hp/trq than my FE and be smoother on the take off? The FE takes anything I've ever thrown and I've got used to it being grabby. Twins are in the future and if the day comes when the FE doesn't take it anymore than maybe this would be the way to go.



Mike