How does the ignition timer and coil work?
The ignition timer and coil work in tandem to fire the spark plugs. The timer’s function is to signal the coil to fire, which sends spark to the spark plugs through the coil-attached plug wires. Both spark plugs fire simultaneously from the coil.
Where is the ignition timer on a Harley Davidson?
What ignites the spark plugs is the ignition coil, which is activated by an ignition timer. Mounted on top of the cam cover, the ignition timer (also known as a circuit breaker) is simply a vertical shaft in a metal housing that contains a set of points and condenser.
How does a CDI coil fire a spark?
The pickup coil is tuned to correspond this and each time the piston reaches just before the TDC, the pickup coil triggers the CDI coil to fire the spark, termed as BTDC (before top dead center. The combustion done with the above process generally produces a good engine functioning and emissions.
How are the contacts on a spark ignition engine closed?
The Contact Points Model spark ignition engines have a set of “points” (aka, “contacts”, or “timer” assembly) which are closed once per revolution by a cam attached to the engine crankshaft. The angle of rotation during which the points are closed is typically 60° and is known as the “dwell”.
What kind of ignition timer did Harley Davidson use?
Harley Davidson Panheads used three types of ignition timers from 1948 to 1965 1948 -1960 used a single contact point manual advance ignition timer. mark should be in center of timing hole for advanced position. slightly before center for retard position.
The pickup coil is tuned to correspond this and each time the piston reaches just before the TDC, the pickup coil triggers the CDI coil to fire the spark, termed as BTDC (before top dead center. The combustion done with the above process generally produces a good engine functioning and emissions.
How does the IC 555 spark circuit work?
The IC 555 is set like an astable that produces and feeds clock pulses to pin#14 of the IC 4017 which in turn responds to these pulses and produces an “jumping” high logic across its output pinouts starting from pin#3 to pin#11 and then back to pin#3.
Why does my car keep retarding the spark?
Reasons a Late Model Vehicle will Retard the Spark. The computer will also retard the spark if the engine is running too hot. Excess heat, coupled with lower octane-rated fuel, will cause the engine to experience spark knock. The spark timing is automatically retarded when knock is detected.