Talk:Jake brake

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[edit] Why so much noise?

Q: why do these things cause so much noise?

A: The compressed gas in the cylinder at the top of the compression stroke is released abruptly and explosively. Why does this cause more noise than the release of exhaust gases on the exhaust stroke in normal engine operation? It is because, in the latter case, the gas is not compressed but rather simply pushed out of the exhaust port by the motion of the piston. There is no abrupt, explosive release.

There is an explosive release, in that the combusted mixture creates pressure, but it only happens once every 2 crank turns (multiplied by no. of cylinders), not every crank turn (x cylinders), and its at a higher pressure during jake (engine) braking, 7legs 090206

[edit] Comment/Any relationship to incline?

Comment on the article: This is the best explanation of the Jake Brake I have seen and has cleared up for me a mystery of 30 years standing.

Question: is there a relationship between the grade of the highway and the weight of the truck which necessitates the use of Jake Brakes? Is it necessary for a loaded 18 wheeler to use Jake Brakes on a 6% grade? How about a 3% grade. Is there an economic reason - use of Jake Brakes increases longevity of brake linings? Somehow I get the impression that Jake Brakes are equivalent to non-mufflered autos - the driver likes the sound. Gary A. McDaniel galrflag@msn.com

I have to laugh - I think you've hit it right on the head! lol. Crabapplecove 13:42, 31 August 2006 (UTC)

Man, I used to love driving rigs with Jake brakes. Drove a cabover Freightliner once that had no mufflers. Just straight stacks. The Jake was loud enough to cause an avalanche. Haven't driven in years, but I still have my CDL. Fun stuff. - Lucky 6.9 07:11, 4 October 2006 (UTC)