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2
votes
When does the spark plug ignite the air fuel mixture?
Four cycle engines have four steps to operate(cycles):
Intake(Suck)
Compression(Squeeze)
Ignition-Power(Bang)
Exhaust(Blow)
As seen here
Technically, the spark ignites the air-fuel mix compressed at … Modern machines have computers, called Engine or Powertrain control modules, that adjust when the spark plugs ignite within the cycle. This reduces emissions and increases power/efficiency. …