Engine lab

Eight cylinders, one cycle

A generic cross-plane pushrod V8: 5.7 litres, 90 degree V. Every motion is computed from the research sheet. Click any part.

Engine speed650 rpm
Crank angle0° of 720°
Cam angle0°
Piston speed 10.0 m/s
Mean piston speed1.9 m/s
Cycle takes0.185 s

Playing at 1/10.8 of real speed

Cylinders firing order 1-8-4-3-6-5-7-2
CylBankStrokeIntake liftExhaust liftPiston

Operating point: idle

Torque smoothing versus speed

Dots are the sheet's five computed operating points; the dashed line is interpolated between them.

Engine speed 650 rpm
Crank angle 0°
0180360540720
power exhaust intake compression cylinder 1
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Cylinder 1 Power

A V8 is four two-cylinder pairs working on a crank shaped like a cross.

Take it apart: every part has a job, and click tells you what it is.

One cylinder, four strokes: intake, compression, power, exhaust, over 720 degrees of crank.

The valves open by the cam, not by the piston, and never exactly at the dead centres.

Firing order 1-8-4-3-6-5-7-2: one cylinder fires every 90 degrees.

Faster does not mean smoother torque alone: the flywheel and the overlap of pulses do the smoothing.

Air in, gas out, oil round, coolant round: the layers show where each goes.

sources: Chevrolet small-block Gen I and L31 published specifications (Wikipedia, GMT400.info), Heywood, Internal Combustion Engine Fundamentals; items marked illustrative are not measurements
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