Interesting idea and some ?s ...
Cruiser
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From: Victoria, Australia
Another consideration is the physics of braking on a motorcycle. More than 70% of effective braking force is generated from the front wheel. Cruiser bike riders are heavy on rear braking, due to the bike design that allows more poor technique than other motorcycle types, but physics still applies.
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Last edited by smitty901; Apr 8, 2016 at 06:30 PM.
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Tourer
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A compression release engine brake, frequently called a Jake brake or Jacobs brake, is an engine braking mechanism installed on some diesel engines. When activated, it opens exhaust valves in the cylinders after the compression cycle, releasing the compressed air trapped in the cylinders, and slowing the vehicle.
When the driver releases the accelerator on a moving vehicle powered by a diesel engine, the vehicle's forward momentum continues to turn the engine's crankshaft. With the example of Mercedes diesels being a notable exception, diesel engines, by design, have no throttle butterfly in the intake so regardless of throttle setting a full charge of air is always drawn into the cylinder. As such, each time air is compressed in a cylinder virtually 100% of that energy is returned to the crankshaft providing very little in the way of engine braking to the vehicle.
The typical compression release engine brake, as originally developed, uses an add-on Hydraulic system utilizing engine oil. When activated, the motion of the fuel injector rocker arm is transferred to the engine exhaust valve(s). This occurs very near TDC and releases the compressed air in the cylinder so that that energy is not returned to the crankshaft. Energy is now absorbed and engine becomes an excellent "brake." If used properly, this energy can be used by the truck driver to maintain speed or even slow the vehicle with little or no use of the service brakes.
Contrast a petrol engine, where the mechanics are different and a special valve is not necessary for engine braking to happen when the driver releases the accelerator. In a gasoline engine, when the accelerator is released, the throttle prevents the free flow of air into the cylinders, so there is little pressure to release at the top of the compression stroke. The closed throttle provides engine braking by forcing the engine to generate a vacuum between the throttle and the cylinders.
https://en.wikipedia.org/wiki/Compre...e_engine_brake
When the driver releases the accelerator on a moving vehicle powered by a diesel engine, the vehicle's forward momentum continues to turn the engine's crankshaft. With the example of Mercedes diesels being a notable exception, diesel engines, by design, have no throttle butterfly in the intake so regardless of throttle setting a full charge of air is always drawn into the cylinder. As such, each time air is compressed in a cylinder virtually 100% of that energy is returned to the crankshaft providing very little in the way of engine braking to the vehicle.
The typical compression release engine brake, as originally developed, uses an add-on Hydraulic system utilizing engine oil. When activated, the motion of the fuel injector rocker arm is transferred to the engine exhaust valve(s). This occurs very near TDC and releases the compressed air in the cylinder so that that energy is not returned to the crankshaft. Energy is now absorbed and engine becomes an excellent "brake." If used properly, this energy can be used by the truck driver to maintain speed or even slow the vehicle with little or no use of the service brakes.
Contrast a petrol engine, where the mechanics are different and a special valve is not necessary for engine braking to happen when the driver releases the accelerator. In a gasoline engine, when the accelerator is released, the throttle prevents the free flow of air into the cylinders, so there is little pressure to release at the top of the compression stroke. The closed throttle provides engine braking by forcing the engine to generate a vacuum between the throttle and the cylinders.
https://en.wikipedia.org/wiki/Compre...e_engine_brake
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