New sdd3250 dual friction dual disc

[South Bend Clutch]

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• We at South Bend Clutch heard the call for the organic dual disc clutch but wanted to offer the best in both durability and drive-ability. How do we achieve that? In our 50 years of experience we knew that running an all organic dual disc would have it’s problems. The intermediate (center) plate is approximately ½” thick whereas the pressure plate and flywheel castings are three times that. Running two friction surfaces on one thin casting will increase the temperature to that casting. Organic burn point is approximately 550 degrees whereas ceramic can reach 1100 degrees. The immediate engagement points when the clutch is released for takeoff are the outside points of a dual disc clutch, pressure plate and flywheel. Being that there is only one friction surface running to these two points, and the fact that the pressure plate and flywheel castings are much thicker than the center plate, the temperatures cannot reach that of the center plate. This is why organic will work to the pressure plate and flywheel and not to the center plate.

• We at South Bend Clutch feel we have reached a milestone in the clutch industry and hope that you will enjoy our hard work at being the industry leader in research and development of clutches for the diesel market.

 

[SierraRam]

I like that idea, would love to test drive one. Lookinf forward to hearing some real world feedback.

 

[EMAC2]

Sounds awesome!!

 

[Regcabguy]

Yeah,some testimony from one of the hundreds of customers you've outfitted with this clutch would be great. Especially G-56 owners.

 

[firemansdiesel]

Dang, I just ordered my DD3250 last week. I would not mind trying this version out.

 

[Nyoest]

Neato. Would it be availible to upfit my current DD setup when I need a rebuild? I like it but without a trailer it's harsh.

 

[seafish]

Dang, I just ordered my DD3250 last week. I would not mind trying this version out.

I would give them a call and see if they'll upgrade your order... SBC has only exemplary customer service and wants people to have the right clutch for their truck.

 

[NIsaacs]

This is an interesting post as I have always been interested in clutches. I have some questions and comments.



To me, a twin disk is for sled pulling, drag racing or just being hard on clutches in general. For just the street driven truck or even towing heavy, a single disk should do the job. Some might think for commercial duty hauling, you need a twin disk. Not so. In actual usage, a city driven truck will be harder on the clutch than the hauler. The hauler might drive several hours and never use it, only the hub. A good heavy duty hub is key and should be able to be done in single disc form.



A twin disk is expensive, heavy and hard on cranks/main/thrust bearings, pilot bearings, input shafts and syncros. The center plate, over time, will get rusty and covered in clutch dust and start to hang up, enough, that the inner disc will drag.



Just give me a good single disk, I am good to go.



Nick

 

[Bob4x4]

This is an interesting post as I have always been interested in clutches. I have some questions and comments.



To me, a twin disk is for sled pulling, drag racing or just being hard on clutches in general. For just the street driven truck or even towing heavy, a single disk should do the job. Some might think for commercial duty hauling, you need a twin disk. Not so. In actual usage, a city driven truck will be harder on the clutch than the hauler. The hauler might drive several hours and never use it, only the hub. A good heavy duty hub is key and should be able to be done in single disc form.



A twin disk is expensive, heavy and hard on cranks/main/thrust bearings, pilot bearings, input shafts and syncros. The center plate, over time, will get rusty and covered in clutch dust and start to hang up, enough, that the inner disc will drag.



Just give me a good single disk, I am good to go.



Nick

With a high horse power engine it is impossible to get a smooth engagement (ie trailer backing) and one that can hold the power.

For those that want both the dual disc is the only game in town.

 

[NIsaacs]

With a high horse power engine it is impossible to get a smooth engagement (ie trailer backing) and one that can hold the power.

For those that want both the dual disc is the only game in town.

Backing a heavy trailer uses very little power. The jerking is mostly caused by a two piece drive shaft, weak motor mounts, loose rear axle mounts/springs or weak clutch hub.



As far as, go forward power, a single disk will hold an empty truck or even a loaded truck if you don't slip it. If the truck in question has so much power that a "good" single disk wont hold it, chances are, due to other issues you cant use the power anyway. In general duty driving, loaded or empty, there is no reason to slip a clutch. Let it grab and "set" before reapplying power after a shift.



Nick

 

[Bob4x4]

Evidently you have never driven a high hp ctd. The type clutch facing material on a single disc to hold over 1k torque will not allow smooth take off forward or reverse and that has nothing to do with any other drive train or suspension parts... ... ... . been there done that. I have tryed over a half dozen different size and materials of clutches- a single that has smooth engagement will not hold the power. Peak torque comes on and clutch slips :-laf

 

[NIsaacs]

Yes, I have never driven a huge HP/torque monster Cummins in a pickup with a twin disk or any other for that matter so I am sure I will learn something here, the whole idea of the thread and to debate it, thanks for the feed back.



I do have all power modified trucks that have to tow heavy. I have and still do use ceramic type disk material and like it as long as it is shaped like a normal disk clutch. I do not care for the button type. I also have no problem with clutch engagement with ceramic material. Let the sucker out, why slip it? If you do need to feather it (rare) make sure your heal is on the floor and only use ankle movement. Don't let your leg and foot flop like a fresh butchered chicken



Like I mentioned in my first post, there are places for the twin, just seems like they are touted more than is necessary. A good single works.



Nick

 

[South Bend Clutch]

Neato. Would it be availible to upfit my current DD setup when I need a rebuild? I like it but without a trailer it's harsh.

Yes you can.



Peter

 

[South Bend Clutch]

Dang, I just ordered my DD3250 last week. I would not mind trying this version out.

Have you install it yet?



Peter

 

[South Bend Clutch]

Yeah,some testimony from one of the hundreds of customers you've outfitted with this clutch would be great. Especially G-56 owners.

03-09-2012, 05:11 PM #8

TXDSLSHOP









Name: TXDSLSHOP

Title: Comp Diesel Sponsor

Status: Not Here

Join Date: Oct 2007

Location: Madisonville, TX

Member`s Gallery

Posts: 139 Saw this post and wanted to stop by and chime in on my experiences with the new dual friction 3250 in my G56 500hp daily driver. I have been running it for about 5K miles, over the last 2 months, and have driven and installed more than I can count of the old 3250GK's. Pete has really done his homework on the linings with this clutch. I have not been easy on it, by any means, and it has performed flawlessly. Extremely smooth engagement along with being quiet. We have towed heavy with it, and even backing up loaded in sand, it continues to return extremely smooth engagement. I absolutely love it, and it will remain in my truck now that the beta testing is done. If anybody has any questions you are more than welcome to give me a ring. Jeremy 936-337-4333

__________________

2005 2500 4x4 125HP inj, Hamilton 181/210, Studs, South Bend 3250 Dual Friction, Ready for some Twins!!

1998 12 valve 4x4 NV5600 Conversion, South Bend 3600 Dual Disc, TDS Injectors, Hamilton Big Stick, Air Dog

Diesel Performance Parts from Texas Diesel Shop - Texas Diesel Shop



Today, 12:08 PM #13

homewrecker









Name: homewrecker

Title: gear jammer

Status: Not Here

Join Date: Oct 2007

Location: N. C. foothills

Member`s Gallery

Posts: 921 I just installed one of these in a G56 last week. Quiet,quiet, quiet and super smooth engagement. Absolutely no floater plate noise. Made me jealous with my sfi 3600 in my nv5600. Great job Peter.

__________________

05 ram 3500 4x4 QC dually

SSR

Exergy

E. D.

SouthBend

Floor It

 

[Regcabguy]

Looks good Peter!

 

[Bob4x4]

Nice..... a modern clutch that holds the power and QUIET

 

[firemansdiesel]

Have you install it yet?



Peter

Tomorrow morning at Left Coast Diesel.

 

[BDaugherty]

Got mine in the mail yesterday (3/16). Ordered it from Wally at FTE. Shipped same day and arrived quickly. Sure is a heavy sucker. I opened the box to admire, but it will be a week or two before I get caught up enough working on everyone else's stuff to have time to work on my own. I sure can't wait to be able to put all the available power to the ground. Right now my stock clutch won't hold higher than power level 2 on my TST.

 

[firemansdiesel]

I had my SBC Street DD3250 (I guess it's considered the old model now) installed a couple days back and very happy with it. A little rattle in neutral and growl in 5th if I lug it. Very quiet compared to my buddies '06 that had a SBC DD3250 installed 2-3 years ago.

I also noticed that the stock clutch must have been slipping some. The truck seems to pull a little better now with the new clutch. Time to do more tuning with EFI!

BDaugherty - Give your feed back when you get that sucker installed.