Use a socket, short extension and a breaker bar on the front crankshaft bolt that holds on the vibration damper. Rotate the engine clockwise from underneath the vehicle.
The length of the crankshaft throw is the stroke of the engine.
It depends on if the cylinders are in line or 'V' formation
the power stroke
The Crankshaft!
A two stroke engine has half the strokes of an otto (or four stroke) engine, therefore it takes two crankshaft roatations to complete a cycle on a four stroke engine and only one revolution in a two stroke engine. There are several types of two stroke engines, the different types have to do with how the receive the air/fuel mixture, also you have two stroke diesel engines.
The four-stroke engine produces 1 power stroke for every 720 degrees of crankshaft rotation.
180 degrees per stroke.
The tachometer is an electrical device that senses the ignition system. It indicates engine RPM (revolutions per minute). Engine rpm and crankshaft rpm are two ways of expressing the same thing. True, the crankshaft does rotate twice for each complete set of cylinder firings but the tachometer counts each rotation.
90 degrees would be a half stroke.
one rotation
The stroke of an engine is the distance the piston travels within the cylinder from bottom dead centre to top dead centre. This is governed by the throw of the crankshaft.
it varies a lot