True Engine Brake for 6.7

[BHiggins]

While thumbing through this month's "Diesel Power" magazine, I came across a small article on a Pacbrake "Weeper" brake, which looks to be a true engine brake for our 6. 7's (which works by opening the exhaust valves at top dead center after the compression stroke, as opposed to just closing the exhaust pipe through the variable geometry turbo). It's supposed to be used in conjunction with the factory exhaust brake, and the claim is that it will increase the retarding, or "negative horsepower", from 150 to 350. I was wondering if anyone is using one yet, and if so, how do you like it? Also, how is the sound compared to the factory exhaust brake? Here's a link to the product page: WEEPER ENGINE BRAKES

 

[RustyJC]

... (it works by keeping the exhaust valves closed during the compression stroke, as opposed to just closing the exhaust pipe through the variable geometry turbo).....

The exhaust valves are always closed during the compression stroke; otherwise, there would be no compression. A true engine brake opens the exhaust valves near the top of the compression stroke, bleeding off the compression pressure before it can push the piston back down on the expansion (power) stroke even with no fuel being admitted to the cylinder. The braking "work" with a true engine brake is the air compression during the compression stroke.



According to the literature, this "weeper" brake is supposed to work by keeping the exhaust valves cracked open during the intake, compression and expansion (power) strokes (thus the "weeper" designation) with the exhaust stroke proceeding as normal. Since this provides a path from the exhaust manifold back into the cylinders during intake, compression and expansion strokes, I'd really want to try it firsthand to see how well it worked in conjunction with the VGT exhaust braking compared to the factory valve events.



Rusty

 

[BHiggins]

My mistake, I knew that but worded it wrong... It's fixed now with the correct info.

 

[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

 

[Motorhead]

thank you for interest pacbrake, 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

not for the 5. 9 ??:{

 

[KLauber]

Now that's something I definitely would be interested in!

 

[Hoefler]

Thank you for interest Pacbrake, 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

Where do we need to reply to?

 

[p-Bar]

Guess us 5. 9 guys are just trailer trash now :-laf

 

[Mikey-KE7LBB]

^^^
Yup!! like a red-headed step child... LOL!!

OR like a "fifth wheel" (multiple meanings)

 

[BHiggins]

I spoke to Doug at Pacbrake, this is NOT a true engine brake for the 6. 7's... A true engine brake opens the exhaust valves at or near top-dead-center on the compression stroke (as RustyJC pointed out above), bleeding off the built up pressure before it can "push" the pistons back down. This brake does something similar, but quite different at the same time. The "Weeeper" brake keeps the exhaust valves open, thereby building more pressure under exhaust braking. The Weeper can only be used IN COMBINATION WITH the existing exhaust brake, and is not capable of functioning as a "stand alone" engine brake... Subsequently, the Weeper brake will NOT make the true "Jake Brake" sound many of us long for. If anyone ever makes one of those, I'd be the first in line. The factory exhaust brake works very well, but you can't beat the sound of an old fashioned "Jake Brake" (even though many municipalities have banned their use due to noise pollution).