Calculate the effective compression ratio (ECR) and geometric ECR (GECR) for a P V diagram shown in Fig. P10.1 for a spark ignition engine operated at 1200 rpm. Assume engine bore/stroke in 86/86 mm...

Calculate the effective compression ratio (ECR) and geometric ECR (GECR)

for a P V diagram shown in Fig. P10.1 for a spark ignition engine operated at

1200 rpm. Assume engine bore/stroke in 86/86 mm and connecting rod dimension 146 mm. Intake valve closing can be assumed at 60 CAD aBDC. The

baseline geometrical compression ratio can be assumed to be 9.3. Estimate the

change in ECR for early exhaust valve closing (EVC) condition in comparison

to normal valve timings.