Re: Jake Brake

Posted by NC Wayne on November 06, 2006 at 20:10:29 from (205.188.117.14):

In Reply to: Jake Brake posted by albert460 on November 06, 2006 at 19:04:28:

To put the operation into it's simplest terms a Jake Brake effectively turns the engine into an air compressor which robs power from the drivetrain instead of supplying power to it. To show you how effective they can be, my service truck has a 275 HP detroit and the Jake, on high, provides about 200HP of braking capacity, and if I set the computer to cause the fan to kick in at the same time, the fan alone provides another 10HP of braking to the mix. I won't attempt to describe the exact process in every make engine but they are all pretty similar. Here's how it's done in the modern 50 and 60 series Detroit 4 stroke engines. Basically the Jake allows a normal 4 stroke cycle of the engine/piston with the exception that on the power stroke it shuts off fuel to the injector and a third cam lobe, one for every two cylinders, strokes a hydraulic piston which in turn strokes another piston through an actuator body/valve. The second cylinder opens the exhaust valve at the last second to dump compression. This is done to capture/rob the power it took to compress the air instead of adding fuel and igniting the mix to gain power. The hydraulic actuator takes oil from the engines oil system and allows it to free flow through it through a normal open solenoid valve. When the Jake is activated the solenoid valve on the actuator closes causing the oil to then be in a closed system so when the third cam lobe rides against the one piston the motion is transmitted hydraulically to the other piston to open the valve. On the Detroits there is an actuator for every two cylinders (ie 2actuators for 4 cylinder, and 3 for a 6 cylinder). That's how they can vary the braking ability of the system. On my 4 cylinder I've got two braking power choices, High gives all 4 cylinders and Low gives just two. The larger series 60 6 cylinder engines usually have High, medium , and low, or 2, 4, or all 6 cylinders. This is what happens in the most basic way i know to describe it. I hope it helps you understand what's going on and what's making all that noise when you hear one going past.

Replies:

• Re: Jake Brake Dave 2N 03:01:32 11/07/06 (0)
• Re: Jake Brake Don-Wi 22:27:17 11/06/06 (1)
  • Re: Jake Brake john in la 00:17:56 11/07/06 (0)

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