The pressure in the ADI system moves the derichment diaphragm in the fuel control to close off the " derichment jet ", reducing the fuel flow to a leaner mixture which produces higher engine power by raising the " mean effective pressure ".
32.
The factor of 2 / 5 accounts for characteristics that were widely seen in engines at the time, such as a Mean effective pressure in the cylinder of 90psi ( 6.2 bar ) and a maximum piston speed of 1000 feet per minute ( 5 metres per second ).
33.
The EMD 265H had a bore of stroke of ( so that the displacement per cylinder was 1, 009.72 cu . in . rounded to 1, 010 cu . in . ) with the 16 cylinder GM16V265H rated at at 1000rpm, with a Brake mean effective pressure of.
34.
Calculated in the usual way ( assuming equal tractive effort from the two engines and mean effective pressure adding up to 0.85 times boiler pressure ) the tractive effort was in compound; in the US, compound Mallets were credited with 20 % more tractive effort in simple mode, or for the Virginian locomotives.
35.
In 2009, Ford modified an experimental 3.5-L V6 EcoBoost engine with both E85 direct injection and gasoline indirect fuel injection, which achieved a brake mean effective pressure of 395 psi ( 27 bar ), which translates to roughly of torque and @ 3000 rpm ( flat torque curve from 1500 3000 rpm ).
36.
The basic configuration of a naturally aspirated Formula One engine had not been greatly modified since the 1967 Cosworth DFV and the mean effective pressure had stayed at around 14 bar MEP . Until the mid-1980s Formula One engines were limited to around 12, 000 rpm due to the traditional metal valve springs used to close the valves.
37.
The later cutoff leads to a larger mean effective pressure that will give a larger power output for an engine of a given size operating at a given speed, but also leads to a decrease in efficiency since steam is at a higher pressure when exhausted from the cylinder and less of its energy has been converted to mechanical work.
38.
A peripheral intake port gives the highest mean effective pressure, however, side intake porting produces a more steady idle, as it helps to prevent blow-back of burned gases into the intake ducts which cause " misfirings " : alternating cycles where the mixture ignites and fails to ignite; peripheral porting ( PP ) gives the best mean effective pressure throughout the rpm range, but PP was linked also to worse idle stability and part-load performance.
39.
A peripheral intake port gives the highest mean effective pressure, however, side intake porting produces a more steady idle, as it helps to prevent blow-back of burned gases into the intake ducts which cause " misfirings " : alternating cycles where the mixture ignites and fails to ignite; peripheral porting ( PP ) gives the best mean effective pressure throughout the rpm range, but PP was linked also to worse idle stability and part-load performance.
40.
At long cut-off and a speed of the indicated mean effective pressure was, which is over 91 per cent of the boiler pressure of, that is to say more than the 85 per cent normally used to calculate the tractive effort at starting . } } The only other locomotives to use such a valve gear were the 20 copies of " Mastodon " ( see below ) and CPR # 237 " El Gobernador ."
