How A Basic Car ignition timing Works
Here we show you how a conventional system works .Note all modern cars timing is still a crucial part of the system .but is now controlled electronically.but is still the same.
When you set the Ignition timing, you actually change the exact moment at which the spark occurs in each cylinder to ignite the petrol.
This Is done by altering the position of the distributor (which controls the flow of sparks).
To simplify the operation, only one cylinder - your handbook or main dealer will tell you which
Is used for timing purposes. All the pistons move in relation to one another in a predetermined order, so when this cylinder Is timed correctly,the others automatically follow suit.
The sparks should occur when the piston in the timing cylinder Is at or near the top of Its stroke.
This means that there must be some way of finding out the exact position of the piston in relation to the spark being produced. To help you, there are a number of timing marks on the engine usually near or on the flywheel or pulley.
All the basic movements of the engine are linked, with no risk of slippage.
As the crankshaft (to which the pistons are connected) turns, so does the pulley at one end and the flywheel at the other.
So either of these can be marked at manufacture to Show the exact stage the engine rotation has reached.
Once the moving timlng mark Is lined up correctly with the fixed marker, the piston is in the right position to adjust the spark.