6.7 vs 8.3 cummins

[Khaki08Cummins]

No, they make an exhaust brake.

Those simply block exhaust flow.
A compression brake (Jake brake, engine brake, intebrake) pushes open the engine's exhaust valve to release compression pressure from the cylinder.

The difference is the exhaust brake is making 65psi MAX exhaust pressure while the compression brake works with over 500psi.


2009 will most likely be common rail unless its an off-road engine.

PacBrake now makes a more traditional engine brake for the 6.7L but it is very limited in application at this time.

P-67 LoadLeash

 

[roachie]

The loadleash is a weeper brake. Has to be used with an exhaust brake.

 

[oldestof11]

No, they make an exhaust brake.

Those simply block exhaust flow.
A compression brake (Jake brake, engine brake, intebrake) pushes open the engine's exhaust valve to release compression pressure from the cylinder.

The difference is the exhaust brake is making 65psi MAX exhaust pressure while the compression brake works with over 500psi.


2009 will most likely be common rail unless its an off-road engine.

Still hiding under that rock known as your head? :nail:

Please tell me how the PacBrake Load Leash operates and is an exhaust brake.

 

[roachie]

Yes, but a front geartrain commonrail ain't a old medium duty 5.9. The bolt patterns on the back of the block are different and possibly the dowel locations are different.


I have a pretty good sized stack of SAE B series housings sitting here.

They changed the flywheel housing bolt patterns?

happen to have a driver side start sae 3 housing?

 

[9724VF350]

They changed the flywheel housing bolt patterns?

happen to have a driver side start sae 3 housing?

I've not worked on a CR personally, but a buddy of mine owns a very busy light truck repair shop, had a engine stand built with the mounting plate drilled for a 12V. It's not a universal engine stand, Cummins only. A CR won't bolt to it.

I should get off my butt and just put a housing up to the Mopar 6.7 shortblock I have sitting here.

I'll see how many of those housings I have. I know I have 1 that is going in my truck when I find a transmission that I want.

I have a abundance of passenger side #2 housings. Wish I could find a use for them.

 

[roachie]

I have a passenger side #3 and it is a no go with twins. Not real sure what clutch housing an RT6610 uses though.

 

[9724VF350]

I have a passenger side #3 and it is a no go with twins. Not real sure what clutch housing an RT6610 uses though.

I can make use of passenger side #3's is certain farm tractor stuff. I actually try to use them there and save the drivers side versions.

 

[Tormentor]

Please tell me how the PacBrake Load Leash operates and is an exhaust brake.

As noted by roachie, its a weeper brake that makes little retarding power on its own. It requires an exhaust brake or VGT to work.

Another issues is it returns exhaust flow to the cylinders and it keeps an exhaust valve continuously off its seat during operation, risking overheating/failure of the exhaust valve if used immediately after heavy engine loading.

Actual engine brakes work so well because they release the compression pressure at TDC. Releasing the 500+psi of work from the 2nd stroke in addition to making the engine pull a partial vacuum in the cylinder on the 3rd stroke. Making it far more effective and reliable (since the exhaust valve is only off the seat during the "injection" phase.