โJul-08-2019 11:25 AM
โJul-11-2019 08:46 AM
โJul-10-2019 05:12 PM
4x4ord wrote:Lynnmor wrote:
So what is this thing?
They want us to believe it is similar to a "big rig" engine brake. It is more effective than a standard exhaust brake but it is still nothing like a jake brake. If you think of an engine as an air pump you can imagine how restricting the exhaust raises the pressure at which the volume of air is being pumped at and creates more braking. Downshifting speeds the engine up which causes the engine to pump more air which also creates more braking. The Packbake holds the exhaust valve off its seat during engine braking. So with the Pac brake the piston pushes air past the slightly opened exhaust valve causing braking on the compression stroke. The pressure on the piston would be equal to the exhaust back pressure created by the restriction at the turbo. The cylinder would refill through the slightly opened exhaust valve on the power stroke and then offer the same braking as a typical exhaust brake on the exhaust stroke. Again it is the power require to force the air past the turbo that is creating the braking.
โJul-10-2019 02:09 PM
Trixie47 wrote:
Pulling a 2012 39 ft. 5th wheel with a 2008 Chevy Silverado 3500 dwd. Question is: what is best ? Jake brake or Exhaust brake ?
โJul-10-2019 09:45 AM
Lynnmor wrote:
So what is this thing?
โJul-10-2019 09:08 AM
โJul-10-2019 06:05 AM
โJul-10-2019 02:59 AM
rhagfo wrote:ACZL wrote:
Would take a heck of a lot of modding to stuff a engine that uses a Jake brake in a pick up. If I'm not mistaken, I think Cummins invented the Jake Brake and granted it's use for all semi engines but some mfr's may offer their own version of a Jake to which (IMO) aren't as good. A true Jake requires the engine to be between 1600-2000 to get the best retarding power. Exhaust brakes offered by Ford, GM & Ram are better than nothing and from what I gather, folks seem to be quite happy w/ them.
Not so, PacBrake makes an engine brake for the Cummins 6.7 that is a bolt on kit. Looks like it raises the valve cover about 1-1/2โ.
โJul-09-2019 09:31 PM
ACZL wrote:
Would take a heck of a lot of modding to stuff a engine that uses a Jake brake in a pick up. If I'm not mistaken, I think Cummins invented the Jake Brake and granted it's use for all semi engines but some mfr's may offer their own version of a Jake to which (IMO) aren't as good. A true Jake requires the engine to be between 1600-2000 to get the best retarding power. Exhaust brakes offered by Ford, GM & Ram are better than nothing and from what I gather, folks seem to be quite happy w/ them.
โJul-09-2019 08:34 PM
ktmrfs wrote:ACZL wrote:
Would take a heck of a lot of modding to stuff a engine that uses a Jake brake in a pick up. If I'm not mistaken, I think Cummins invented the Jake Brake and granted it's use for all semi engines but some mfr's may offer their own version of a Jakeibetween 1600-2000 to get the best retarding power. Exhaust brakes offered by Ford, GM & Ram are better than nothing and from what I gather, folks seem to be quite happy w/ them.
Clessie Cummins, one of the founders of what became Cummins engine is credited with the invention of the jake brake in the late 50's. It was granted a patent in the early 60's. I think by that time he was not associated with Cummins and when he went looking for someone to market it, Jacobs mfg was the only taker, which, relates to how it got it's name, Jake brake. Jacobs started mfg it in about 1961 IIRC. BTW it's the same Jacobs that makes 3 jaw drill chucks.
โJul-09-2019 05:45 PM
ACZL wrote:
Would take a heck of a lot of modding to stuff a engine that uses a Jake brake in a pick up. If I'm not mistaken, I think Cummins invented the Jake Brake and granted it's use for all semi engines but some mfr's may offer their own version of a Jakeibetween 1600-2000 to get the best retarding power. Exhaust brakes offered by Ford, GM & Ram are better than nothing and from what I gather, folks seem to be quite happy w/ them.
โJul-09-2019 12:32 PM
โJul-09-2019 01:09 AM
โJul-08-2019 03:08 PM
โJul-08-2019 02:24 PM