(EDIT - I'd argue that the JB in ETS2 is an exhaust brake too. Jake Brakes use one of several systems - the one you described is another. w/o spliiting hairs, a Jake Brake can also be an exhaust brake - it can use a valve to close of the exhaust creating higher engine compression. Originally posted by Xivios:^ Jake Brakes aren't exhaust brakes, they can utilize the exhaust valves and dump compression to the exhaust system, but they aren't considered exhaust brakes because they don't utilize exhaust gases directly, rather they utilize the compression within the closed cylinder. Hydraulic retarders are extremely quiet, often inaudible over the sound of a running engine, and are especially quiet in operation compared to engine brakes. The degree of retardation can be varied by adjusting the fill level of the chamber. The working fluid will heat, and is usually circulated through a cooling system. When retardation is required, fluid (oil or water) is pumped into the chamber, and the viscous drag induced will slow the vehicle. The vanes are enclosed in a static chamber with small clearances to the chamber's walls (which will also be vaned), as in an automatic transmission. They can also be driven separately via gears off a driveshaft. There are several different types which can use standard transmission fluid (gear oil), a separate oil supply, or water.Ī simple retarder uses vanes attached to a transmission driveshaft between the clutch and roadwheels. Hydraulic retarders use the viscous drag forces between dynamic and static vanes in a fluid-filled chamber to achieve retardation. I asked a former trucker what the retarder actually was, the retarders added to the game are hydraulic retarders, acting on the transmission.
Jake brakes were already in the game prior to the patch. ^ Jake Brakes aren't exhaust brakes, they can utilize the exhaust valves and dump compression to the exhaust system, but they aren't considered exhaust brakes because they don't utilize exhaust gases directly, rather they utilize the compression within the closed cylinder.Įxhaust brakes cause a restriction in the exhaust to slow a vehicle, Jake brakes release compression in the cylinder so that it can't push the piston back down to slow a vehicle. The amount of power extracted from the transmission can be up to 90% of the rated power of the engine for certain engines.
By doing this, the engine acts as an air compressor, with the energy coming from the transmission used to compress the air, hence slowing the vehicle. Cummins, founder of Cummins Engine Company, realized that by opening the cylinder exhaust valves when the piston reached top dead centre, rather than at the end of the power stroke, the accumulated compressed air in the cylinder could be vented before it could act as a 'spring' to drive the piston back down again. The engine braking generated by creating partial vacuum with a closed throttle at each intake stroke in petrol/gasoline engines does not apply to diesel engined vehicles - diesel engines are quite 'free-running'. Diesel engines regulate power output purely by the volume and timing of fuel injected into the cylinders combustion chambers. It works like the Jake Brake but you can increase/decreases it's effect.ĭiesel engined vehicles do not have a throttle.
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