Harley Davidson Engine Firing Sequence

The sound is actually from the engine design.

Harley davidson engine firing sequence. The firing sequence of internal combustion engines is the sequence of ignition for the cylinders in spark ignition eg. That puts the rear cylinder into its power stroke and the front is on its intake suck stroke being pulled down by the crank. Here is an illustration of your crank shaft.

There are many possibilities of what you have. This is due to the difference in numbering and firing order. The difference in the Harley engine is that the crankshaft has only one pin and both pistons connect to it.

Engine cranks and starts. Fire-crank rotates 315fire-crank rotates 405fire-crank rotates 315fire-crank rotates 405 lather rinse repeat. So there it is.

315 405 720 So a Harley V-twin has a 315 firing interval. The W3 uses its cubic inch to create the power thus keeping the package very reliable. Nr2 piston fires after 315 crank rotation There is then a 405 crank rotation Nr1 then piston fires again and cycle continues.

Instead of one piston firing every 360 degrees a Harley engine goes like this. Spark plug gap - 0038-0043 in. Its 1-2 front cylinder fires 315 degrees later rear cylinder fires 405 degrees later front cylinder fires.

The crankshaft has only one pin and both piston rods connect to it. So heres the firing order. The engine sounds like it does because the firing order is irregular it kind of lopes along as it has since 1903.