I hope it lasts long enough for the South Bend unit to show up!

 

Once you install a SB with the single mass shouldnt it be the same as the NV flywheel set up?

 

That's what I'm afraid of... Dodge put the dual-mass clutch on there for a reason - namely the vibration from the CTD hurting the tranny at low RPMs.

 

WHat exactly is a dual mass clutch versus what the SBC's have ? Can you add anything to the SBC to get rid of the vibration ?

 

I am adding a Fluidampr to mine. From my research on here it seems to help with the DD.

 

You are adding a Fluid what ? It helps with the "DD" ? Sorry, I am not following.

 

Here is a little info https://www.dieseltruckresource.com/...ight=Fluidampr

That and other threads have made me buy one.

 

Well, technically the G56 is hooked by the clutch to a dual-mass flywheel, or DMF. Our trucks use a DMF manufactured by LUK in Germany - they've been making them for decades. The DMF is basically like a harmonic dampener for the transmission; the front (with ring gear) and rear (with clutch face) have a certain amount of rotational freedom from one another, controlled by long circumferentially-wrapped coil springs. There's another dampening material as well (perhaps Sorbothane?) that minimizes the resonance peaks that a DMF magnifies at less-than-idle engine RPMs (ie: startup & shutdown). Harmonic vibrations are very hard, metallurgically, on both rotating and reciprocating parts (and of course the NVH people don't like them either!), which is why engines have a harmonic dampener at the front of the crankshaft. There's a few different types of aftermarket harmonic dampeners available that may help, but I still think it's important to hang one on the other end of the crank.

I'm not sure how many problems there's been with the DMF itself (I know the clutch itself probably won't hold more than an extra 150HP very long, depending on how you drive it), but I believe the internal spring rate of the DMF would be the limiting factor.

Interestingly, the clutch facing for the G56 has a 20% larger area than the clutch facing for the NV5600, and the G56's useable clutch thickness is twice that of the NV's...

 

Thank you very much! I will definitely have to get that!