Ignition timing (or spark timing) controls when the spark plug fires during the Compression Stroke. Ignition timing is measured in degrees of crankshaft rotation, before top dead center (BTDC). In a perfect world, The spark plug fires. The flame travels through the combustion chamber, igniting the air/fuel mixture.

The Initial Timing is now set for 10 degrees BTDC. The engine should start right up! After Start-Up. Break in your camshaft. Flat Tappet Break-In Procedure; Roller Tappet Break-In Procedure; Adjust your ignition timing using the Total Timing Procedure.

Ignition Timing Advance can be handled Mechanically and/or with Vacuum, just like with a carburetor. However, there are advantages to computer controlled timing. If you’re planning on nitrous or forced induction, Timing Control Compatible EFI is a must. What are the benefits? Fuel injection delivers fuel more precisely than a carburetor.

Set your Timing Light to your desired total timing. Start the engine. If you have Vacuum Advance, disconnect it. Rev the engine past the point where your mechanical advance is fully engaged. (Usually, 3,000 - 3,500 rpm will do it.) Watch the timing …

The mechanical (or centrifugal) advance is an Ignition Timing control mechanism built into most distributors. It is made up of: Two weights, An advance plate or cam attached to the trigger mechanism inside the distributor, and; Springs that control how fast the weights are flung outward. How does it work?

Over-Advanced Ignition Timing If Ignition Timing is too far advanced, the spark plug fires too soon. This causes the flame to end early. The remaining fuel can detonate. Lean Air/Fuel Mixture A rich Air/Fuel Mixture runs cooler than a lean mixture. …

Set the Initial Ignition Timing. For carbureted engines, make sure fuel bowls are full and any air is bled from the fuel lines. Start the engine and immediately raise rpm to 3,000.

The gear should be slightly softer than the camshaft. This will ensure accurate ignition timing and a long engine life. If the gear is too soft, it will quickly wear out. If the gear is too hard, it will wear the camshaft. Excessive wear will affect the ignition timing. …

Ignition timing (or spark timing) controls when the spark plug fires during the Compression Stroke. Ignition timing is measured in degrees of crankshaft rotation, before top dead center (BTDC). In a perfect world, The spark plug fires.

Camshaft selection and Ignition Timing may need to be adjusted. Related Products: Cylinder Heads, Engine Assemblies, Pistons & Piston Rings Email Sign Up