PacBrake "Weeper Brake"

[NIsaacs]

Anyone know anything about this new design, from PacBrake? It looks like it is very simular to a true Jake. Fits most engines, one model fits a full length valve cover and one fits the individual covers. Also can be used in conjunction with an exhaust brake for more retarding. PacBrake vendors... . any news??



Nick

 

[mwilson]

My son Seth has been babbling about it for a week now... ... .



Says it fits the 6. 7 engines and that it will work in addition to the turbo brake.



I have not studied it yet, maybe a good project in the morning during my Saturday morning coffee... ... .



Mike.

 

[NIsaacs]

Thanks Mike, I want three



I went to Pac's web site and it looks real promising, but no info on engine models yet. It does have a performance graph with engine liter input thats interesting.



It looks to be more compact and simple. It does not require it's own housing or spacer housing between the head and valve cover, also no input from the cam shaft for actuation like the Jake and Pac compression brakes, yet it is a compression brake and works the exhaust valves. It looks very simular to Macks old Dynatard maybe.



Nick

 

[mwilson]

Seth found it in the newest Diesel Power magazine... he tried to find a link to it but no luck...



These guys are hunting for info as well... .



Pacbrake weeper - Dodge Cummins Diesel Forum



I'll line up for one, that would be incedible on the '06 if they use the current ECM controls for it... ... Oo.



Mike.

 

[Pacbrake]

Thank you for interest in Pacbrake products, we are excited for the upcoming release of our latest engine brake design.

At this time we can release the following details:

• PRODUCT LAUNCH FALL 2012 - 2008-2012 Dodge 2500-5500 Cummins ISB 6. 7L
• PRE-PRODUCTION LAUNCH - June 2012 for approved customers. Applications will be available in April 2012 to apply for this limited run

Please note installations will be performed by certified installing dealers only.

If you're truck meets the specs list shown above and you are interested in our brake, please respond with the following information:

• Truck year, model
• Reason for additional braking (what do you tow, and how much does it weigh)
• Your city and state

More detailed product information will be posted on our website as it becomes available.
Pacbrake

 

[RustyJC]

This is being discussed HERE as well. It is nothing like a true Jake Brake that opens the exhaust valves near the top of the compression stroke, accomplishing its braking function by capturing the work required to compress the air during the compression stroke before the compressed air can push the piston back down on the expansion (power) stroke. . This device holds them slightly open all the time except for the exhaust stroke when the exhaust valves apparently open normally.



Rusty

 

[mwilson]

Right and it will need the existing exhaust brake to push against. Or it will just go "pfffffffffft"... ... ... . :-laf



Mike.

 

[WDixon27]

sounds like it could get interesting if it has 300+ hp of braking power, probably need a safety of some sort to keep from locking up the tires and jackknifing or looping it unloaded

 

[NIsaacs]

sounds like it could get interesting if it has 300+ hp of braking power, probably need a safety of some sort to keep from locking up the tires and jackknifing or looping it unloaded

I think, based on Pac's performance graph (7-liter) it can be used as a stand alone, rated about 150 hp retarding at 3000 rpm and 280 hp combined. So under slippery conditions, use one or the other, also use reduced rpm for less retarding.



Not that I have a 6. 7 or will have one in the near future, it still kinda sucks that it has to be installed by a dealer. Install cost could be as much as the brake.



I am sure Pac will concentrate on current production engines before spending time and money researching older engines.



Since the exhaust valve appears to stay open during all cycles of the engine, I wonder what happens when 50 lbs of back pressure hits the intake system when the intake valve is open? Rusty?? Any Idea?? Will the turbo stop?? Will the compressor wheel unscrew or something:-laf



Nick

 

[zzman]

This will also kill the engine if stayed on at idle, unlike exhaust brake.