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An exhaust brake is a valve which essentially creates a back-pressure in the exhaust system, which applies enough force onto the engine's pistons to slow the engine. In most cases, an exhaust brake is so effective that it can slow a heavily-loaded vehicle on a downgrade without ever applying the vehicle’s service brakes.
A compression release brake (also known as a Jacobs brake or "jake brake"), is the type of brake most commonly confused with real engine braking; it is used mainly in large diesel trucks and works by opening the exhaust valves at the top of the compression stroke, so the large amount of energy stored in that compressed air is not returned to ...
A compression release engine brake, compression brake, or decompression brake is an engine braking mechanism installed on some diesel engines. When activated, it opens exhaust valves to the cylinders, right before the compression stroke ends, releasing the compressed gas trapped in the cylinders, and slowing the vehicle.
Exhaust brakes are simpler in operation than an engine brake.Essentially, the exhaust pipe of the vehicle is restricted by a valve.This raises the pressure in the exhaust system, forcing the engine to work harder on the exhaust stroke of its cylinders, so again the engine is acting as an air compressor, with the power required to compress the air being withheld from the exhaust pipe, retarding ...
Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston 's movement on the induction stroke and the airflow through a throttle in the intake manifold of an engine.
Late model 2011 Ram trucks produce 350 hp (261 kW; 355 PS) and 800 lb⋅ft (1,085 N⋅m), with the exhaust brake rating boosted from 150 hp (112 kW; 152 PS) to 222 hp (166 kW; 225 PS). [10] For 2019 this engine has been updated to produce 400 hp and 1000 ft-lb torque.
The brake operates on a principle where exhaust valve cam followers act on a secondary cam profile when engine brake is activated. Engine oil pressure is used to eliminate extra valve clearance thus this action forces the follower against secondary lobes and unseating exhaust valves temporarily to achieve so-called compression bleeding as ...
Brake-specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output.
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