Back to MEP for a minute:
There are 2 versions, Indicated MEP and Brake MEP. As their names suggest, IMEP is derived from the indicator diagram, BMEP is derived from the power output measured on some kind of brake. As any real engine needs some power to keep it rotating, BMEP is always less than IMEP, the difference gives the mechanical efficiency of the engine.
The IMEPis calculated by ascertaining the area of the indicator diagram, which has units of (lb/sq.in * in) and dividing by the stroke, so we finish up with lb/sq.in. The indicated power is then IMEP*(swept volume) * rpm * F. For an engine which completes it's cycle in one revolution, F = 1, for a four stroke engine where the cycle is completed in 2 revolutions, F = 0.5, for a double acting steam engine, F = 2. The answer will be in (lb/sq.in) * cu.in * 1/minutes = lb.in/min, so you need to divide by 12*33000 to get HP. Note that the IMEP doesn't care what the actual pressure in the cylinder is, it is NOT the same as the mean pressure. This will be clear if you consider our single acting steam engine. If I were to restrict the exhaust, the mean pressure would go up, but the area of the indicator diagram would go down since the exhaust line would be higher, and so the IMEP would go down.
BMEP is calculated from power/(swept volume*RPM*F). The power value needs to be expressed in lb.in/min.
On the subject of proof reading, I would say it is almost impossible to successfully proof read your own work because you know what it is meant to say, and so will read it as that no matter what you've written. Many years of writing technical reports convince me that you either get someone else to read it (preferred), or leave it for a few weeks and then read it, but I never had the luxury of such timecales in my working life. In an ideal world Mr Ed would proof read everything, but he seems to have an onerous enough task getting MEW out every month, and he can't be expected to be knowledgeable about everything.