BSFC Numbers for Rotary

[RETed]

Originally Posted by NoDOHC

Actually BSFC is typically expressed as a chart with engine load on one axis, speed on the other axis and BSFC indicated by islands (similar to a compressor isentropic efficiency map for a turbo).

Many engines are rated at peak BSFC which is commonly computed at the highest BMEP (highest torque output). This is the point that I picked.

I realize that engineer-types would insist on a graph version, but most laymen would just see a single number.

I have to disagree that this single number is highest BMEP...

Any engine will have different BSFC values at different speeds and loads. For example, a reciprocating engine achieves maximum efficiency when the intake air is unthrottled and the engine is running near its torque peak. However, the numbers often reported for a particular engine are a fuel economy cycle average statistic.

Taken from: http://en.wikipedia.org/wiki/Brake_s...el_consumption


-Ted