http://www1.eere.energy.gov/vehiclesandfuels/pdfs/hvso_2006/07_fenske.pdf
Need to have an understanding of the principal of BMEP when reading through the presentation. It's an olde British calculation which tries to take power and torque of a running engine, which is the nett output, and then calculate it as an "average" pressure on the piston over the whole stroke.
Power Stroke is very peaky in pressure, hard to trace back in the day (Indicator diagrammes from steam engines wouldn't do the job). Exhaust uses power, inlet uses power, and compression uses power...BMEP is considered the "average" pressure applied to the piston that would provide the power output measured, without the losses.
It's pretty standard, and can be used to cross reference engines.
If it helps, this LS1 engine anaylsis might help in things other than the dyno pulls in engine magazines. (actually, not a bad paper full stop).
This article lists some frictional losses in engines, with some of the stars of he research world.
Interesting to have a comparison of the hydrodynamic versus asperity drag for different lube viscosities.
Surface treatments to improve wear with reduced viscosities.
Economy gains through the use of lower viscosities, and surface treatments.
Cameron Plint test (modified slightly) for ring and liner wear/friction.
Need to have an understanding of the principal of BMEP when reading through the presentation. It's an olde British calculation which tries to take power and torque of a running engine, which is the nett output, and then calculate it as an "average" pressure on the piston over the whole stroke.
Power Stroke is very peaky in pressure, hard to trace back in the day (Indicator diagrammes from steam engines wouldn't do the job). Exhaust uses power, inlet uses power, and compression uses power...BMEP is considered the "average" pressure applied to the piston that would provide the power output measured, without the losses.
It's pretty standard, and can be used to cross reference engines.
If it helps, this LS1 engine anaylsis might help in things other than the dyno pulls in engine magazines. (actually, not a bad paper full stop).
This article lists some frictional losses in engines, with some of the stars of he research world.
Interesting to have a comparison of the hydrodynamic versus asperity drag for different lube viscosities.
Surface treatments to improve wear with reduced viscosities.
Economy gains through the use of lower viscosities, and surface treatments.
Cameron Plint test (modified slightly) for ring and liner wear/friction.
