Engine Brakes:

[Rob]

I found these on the net this morning to further clarify how these things operate, and a little history.

Hope you find the information useful.

Rob

Here are a couple of links:

http://transportation.centennialcollege.ca...akes%202-02.pdf

http://www.heavydutytrucking.com/2001/12/044a0112.asp

[Packer]

I found these on the net this morning to further clarify how these things operate, and a little history.

Hope you find the information useful.

Rob

Here are a couple of links:

http://transportation.centennialcollege.ca...akes%202-02.pdf

http://www.heavydutytrucking.com/2001/12/044a0112.asp

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The best way to discribe a 'Jake Break' is that it turnes the engine into a compressor! When the piston is TDC on compression, the oil system cracks the exaust valve, letting the compression out before it can drivr the piston down. The 'Power Stroke' is now pulling on a vacume.

To make it easy. the power never gets to the crank because the compression is lost before fireing and then pulls a vacume. Both compression and vacume take horsepower, and that works agenst the hill to keep brakes coooool!!!

Compression brakes have a spring loaded flapper that holds 20+ psi on the exaust manifold to make the piston/crank work harder to exaust spent gasses.

Packer