Answer / krishna

1-(1/r^(gama-1))
where r=commpression ratio
gama=1.4 (adiabatic index)

Answer / karthick

efficiency=1-(i^r-1)/i-1

i-->cut-off ratio
r--->ratio of cp/cv

Answer / bhaskar

ηdiesel=1-1/r^(γ-1) ( (ρ^γ-1)/γ(ρ-1) )

r=compression ration
γ=1.4 adiabatic
ρ=cut off ratio ie 2 to 2.2

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