What causes ignition timing to fluctuate?
An overly high amount of ignition advance for a given engine will result in lumpiness at idle, excessive hydrocarbon emissions and sometimes exhaust popping, while too little advance will also cause lumpiness.
What happen if ignition timing would not adjusted properly?
If ignition timing is incorrect and causes the spark plugs to fire too soon or too late, the fuel-and-air mixture will not be ignited at the proper time which will cause the engine to become difficult to start.
What should spark advance be at idle?
In addition, the WSM says spark advance should be between 6 to 18 degrees BTDC at idle.
Can bad timing affect idle?
An engine slightly out of time can idle roughly since the spark is not in sync with the cylinders. Too much timing advance or retardation causes serious drivability problems. Many problems may upset timing. A rough idling engine can be caused by spark plugs or spark plug wires.
How do you treat engine pings?
Severe detonating can raise combustion chamber temperatures from normal to well above the melting point of many metals, causing potentially serious damage to pistons and valves. All things being equal, the quickest cure for detonation is to switch to a higher octane gasoline.
What happens when fuel is ignited at the same 10 degree timing?
As the engine rpm increases to 3,000 rpm, the fuel, — still requiring the same time to burn — would never have sufficient time to burn if ignited at the same 10-degree timing. In order to have the same result, the fuel must be ignited much sooner in the compression stroke.
When to change ignition timing for maximum power?
Optimum timing from a fixed (locked) ignition advance occurs at only one engine speed. Ignition timing is too advanced at engine speeds below that and not advanced enough at engine speeds above that. Changing the timing value up or down changes the engine speed up or down for the optimum ignition timing.
What should the ignition timing be for a blown alcohol engine?
Less ignition timing is needed for higher power ignition systems. For a blown alcohol engine with an old 2 primary ampere magneto, 38 degrees of timing was common. With a higher power magneto near 4 primary amperes, 36 degrees of timing is common.
Which is the correct definition of ignition timing?
Ignition timing refers to the point at which the spark plugs ignite the fuel within an engine’s cylinder.