I have 1993 U280 with no jake brake,,, Cummins says they can put one on the parts are 1700.00 not with labor.
I have looked on Google some say Pac Brake is the same as Jake . Is that true?
I live in Northwest and need something to assist the mountains
Would any please let me know if they have added a Jake to their Cummins with six speed Allison, I believe 300hp
Rick
509-939-0740
rlmlimited@comcast.net
Terminology. Are you asking about adding a "compression release brake" or a "exhaust brake". Big difference in complexity and cost.
Compression release engine brake - Wikipedia (http://en.wikipedia.org/wiki/Compression_release_engine_brake)
Supplemental Brakes | Pacbrake (http://pacbrake.com/supplemental-brakes/)
We had a PAC brake on our 1993, U225. It was OK for going down hill but did little else. We now have a Jake or Compression brake on our 1993, U300. I leave the Jake on all of the time and it helps with braking in day to day driving. With that said it is my understanding that the current PAC brake has much better performance that the old one I had on the U225. Based on the cost I would choose the PAC brake for your 1993 coach.
Both brakes are more effective at higher engine rpms. One very good rule of thumb is go down hill in the lowest gear you went up the hill. If you coach shifts down to fourth or even third gear going up, start the down hill run in that same gear. Once your speed is up you may not be able to downshift without over revving your engine. Many transmissions will not allow you to down shift at that point.
Are the newer Jake Brakes quieter than the ones I remember in the PNW as logging trucks came down the hill?
NO, they can not put a jake brake/engine compression brake on a Cummins C engine. The Cummins L is the smallest engine that can be fit with one.
What they can do is add an exhaust brake.
I would contact PacBrake with your Cummins engine serial number to find out if they have a PRXB style exhaust brake for your engine. And, if so, what PSI your engine can handle without replacing the valve springs.
Pacbrake is a company name. They manufacturer several types of engine brakes. Here is their website: Diesel Emission Valves, Engine Brakes and Exhaust Brakes (http://pacbrake.com/)
Love the Jake on our Detroit. Works well at higher rpms and since we have the stock muffler, I leave it on most of the time without worrying about Jake (noise) restricted areas. I keeps the four exhaust valves in each cylinder open when you are off the throttle. Jake is a trademarked name. Your electric drill has a Jacobs chuck. Same guy.
Check the chart here. Looks like over 100 hp of braking at 2000 rpm. Cummins QuickServe Online (http://quickserve.cummins.com/info/qsol/products/newparts/jacobs_md_nondodge.html)
Pierce
Jacobs offers an exhaust brake, but the PRXB by PAC brake and the Decelerator by US Gear are newer designs that brake better than a standard exh brake. You will be happy with either. Cummins needs to verify if you have the heavy duty valve springs - the change occurred that year. You save significantly on the install cost. My '93 did not. Great difference in the mountains.