Acompression ignition engine when tested gave an indicator card having area 3250mm^2 and length 73mm. the calibration factor was 0.2 bar/mm. the mechanical efficiency of the engine is 80%. calculate the imep and the bmep

BMEP = 8.904 bar

IMEP =  11.13 bar

Explanation:

given data

area A = 3250 mm²

length L = 73 mm

calibration factor = 0.2 bar/mm

mechanical efficiency = 80 %

to find out

IMEP and the BMEP

solution

first we calculate the BMEP break mean efficiency pressure tat is express as

BMEP =

here A is area and L is length

so BMEP is

BMEP = = 44.52 mm

BMEP = 44.52 × 0.2 bar = 8.904 bar

and

we know mechanical efficiency is

mechanical efficiency =

so put here value we get IMEP

IMEP =

IMEP =  11.13 bar

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explanation: