Comment by mcmoor
3 hours ago
It's unclear to me, why would the compression stroke (the 2nd out of 4) happens? There's nothing pushing the piston upwards.
3 hours ago
It's unclear to me, why would the compression stroke (the 2nd out of 4) happens? There's nothing pushing the piston upwards.
It's being pushed up by the crankshaft which keeps moving because of the inertia of the moving engine parts, especially the flywheel. On multi-cylinder engines, other cylinders add torque at different phases of the rotation.