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What Is the Firing Order on a 1970 Chevy 307 Engine

Car engine pistons stroke up and down with the spark plug firing once for every four strokes. Each spark plug fires at a different time, providing balanced power as the engine runs. Firing order describes the sequence the pistons fire in.

Coil

The coil provides the electrical energy to make a spark. It delivers the energy to the ignition control system, which on older vehicles is a mechanical device called a distributor. Newer vehicles use advanced electronics to distribute the spark to the cylinders.

Cylinder Firing

The ignition control system delivers the spark to a cylinder at the exact moment the cylinder is ready to fire. The piston is nearly at the top of its compression stroke and the intake valve is closed. Each piston is ready to fire at a different time.

Firing Order

As the engine turns, each piston reaches the top of its compression stroke and fires in an exact order that provides the engine mechanical balance. Chevrolet 307 V-8 engines have a cylinder firing order of 1-8-4-3-6-5-7-2. The front right cylinder is cylinder No. 1. The front left cylinder is cylinder No. 2. The second cylinder on the right is cylinder No. 3 and so on.

Posted by Unknown at 12:15 AM

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