With a Jacobs Engine Brake® |
| (1A) The intake valve opens and air is forced into the cylinder by boost pressure from the turbocharger. |
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| (2A) Air is compressed to approximately 500PSI by the engine piston. The energy required to compress this air is produced by the vehicle's driving wheels. Near top dead center, the Jacobs Engine Brake® opens the exhaust valves, venting the high pressure air and dissipating the stored energy through the exhaust system. |
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| (3A) On the downward stroke, essentially no energy is returned to the piston (and to the driving wheels). There is a loss of energy. This loss is how the retarding work is done. |
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| (4A) Normal exhaust stroke. |
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Heavy Duty Jake Brakes
