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However, mean effective pressure does not reflect the actual pressures inside an individual combustion chamber – although the two are certainly related – and serves only as a convenient measure of performance. [2] Brake mean effective pressure (BMEP) is calculated from measured dynamometer torque.
The theory behind this sort of arrangement is that maximum brake mean effective pressure (BMEP) is developed at relatively low engine speeds, resulting in an engine with a broad torque curve. With its relatively flat torque characteristics, the "W" engine was well-suited to propelling both the trucks and heavier cars that were in vogue in the ...
The Alco's design goals for the 241 engine were a high operating speed, a high cylinder output of 135 psi bmep (brake mean effective pressure), a high horsepower to weight ratio, and the capability for growth with later improvements. World War II had begun and the wartime environment caused all of Alco's businesses to grow. The diesel engine ...
Brake horsepower per cubic centimeter or (bhp/cc) is a figure of merit that is used to indicate the 'state of tune' of an internal combustion engine. It is defined as the ratio of the engine's net power output to its displacement, the internal size. Power is measured at its rated speed and full throttle.
As originally configured for the Erie-Built locomotives of 1945, the engine ran at a Brake Mean Effective Pressure of 95.2 psi, as opposed to the 85 psi rating for Navy engines and higher than the engines in competing locomotives. [15]
Engine designers use expressions other than horsepower to denote objective targets or performance, such as brake mean effective pressure (BMEP). This is a coefficient of theoretical brake horsepower and cylinder pressures during combustion.
In 1942-43, a range of configurations was considered and it was concluded that, for good breathing and high brake mean effective pressure (BMEP), the new engines would need vee-opposed valves operating in hemispherical combustion chambers. Two configurations of this type were selected for comparison in 1943 and the prototypes named "XG" and "XF".
At about 140 in Hg (~54 psi), an immense power output of 837 bhp (624 kW) at 8,200 rpm was achieved. This is equal to 305 bhp/liter (5.0 bhp/cu.in) and a brake mean effective pressure (bmep) of 483 lb/sq.in.