Powerfist 8000943 Fiche Technique Et Manuel D'utilisateur page 5

V4.0 Engine Timing Light 8000943
OPERATION
ENGINE TIMING
Timing is defined as the ignition of fuel in the engine cylinder when the piston is
Top Dead Center (TDC) during the engine cycle (Fig. 1). Timing is given in
degrees Before Top Dead Center (BTDC) or After Top Dead Center (ATDC).
Consult the engine manufacturer's timing specifications.
Engine component or ignition system wear can affect the engine timing. The
ignition occurs BTDC or ATDC, generates less mechanical energy and results in
Fig. 1
poorer fuel economy. When the spark plug ignition is responsible, this is
referred to as Spark Advance or Spark Retard respectively. Some engines are
designed so the timing spark will occur several degrees before TDC to obtain
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