What is spark advance?

Advancing the ignition timing helps raise the high-end power while reducing the low end. It also helps get the spark past the ignition delay and run at peak power. Ignition timing retarding causes the spark plug to fire later in the compression stroke.

Why does SI engine need spark advance?

Timing advance is required because it takes time to burn the air-fuel mixture. Igniting the mixture before the piston reaches TDC will allow the mixture to fully burn soon after the piston reaches TDC.

What should spark advance be at?

That is typically 15-35 degrees before TDC (top dead center) of the power stroke depending on the engine speed. Best power is achieved when ignition timing is set to fire the spark ahead of time to reach that peak pressure at about 2 degrees after TDC.

What is meant by ignition advance?

Ignition Advance Advancing the timing means the plug fires earlier in the compression stroke (farther from TDC). Advance is required because the air/fuel mixture does not burn instantly. It takes time for the flame to ignite the all the mixture. However, if the timing is advanced too far, it will cause an Engine Knock.

Which way is advance timing?

Turn the distributor in a counterclockwise direction to advance the ignition timing. Do not over-adjust the distributor, as even a slight movement will yield a significant change in the ignition timing.

Is spark advance the same as timing?

Ignition timing advance refers to the spark plugs which are firing beforehand in the stroke of compression, which is also far away from TDC. So, spark advance is not the same as ignition timing because of the representative variation of the performance with ignition timing.

What is normal spark advance at idle?

Most engines have between 5-20 degrees of ignition advance at idle. This is referred to as initial timing.

What is LTE time advance?

Timing advance is a negative offset, at the UE, between the start of a received downlink subframe and a transmitted uplink subframe. This offset at the UE is necessary to ensure that the downlink and uplink subframes are synchronised at the eNodeB.

What is load PCT?

LOAD_PCT are: Reaches 1.0 at WOT at any altitude, temperature or rpm for. both naturally aspirated and boosted engines. Indicates percent of peak available torque. Linearly correlated with engine vacuum. Often used to schedule power enrichment.