PASCO TD-8565 Adiabatic Gas Law Apparatus - Manual (Page 20)

Experiment 4: Complete Cycle
© 2009 Physics Enterprises 20
Compare with the measured ratio for the Otto cycle in reverse,
You can remove the pins and investigate what happens to the efficiency and the ratio, ξ,
with a larger values of compression ratio, r.
Calculate the ideal efficiency of a gasoline engine where the compression ratio is
normally less than 10:1.
Calculate the ideal efficiency for a diesel engine (assuming that it operates under the
Otto cycle) where the compression ratio is often greater than 22:1.
on
by on
W
W W
−
= ξ
D. Compute the compression ratio from the ratio of the maximum to minimum cylinder
heights,
Calculate the theoretical efficiency of an Otto cycle as
__________
min
max
min
max = = =
h
h
V
V
r
1
1
1
−
− =
γ
η
r
Otto
= __________