Spark Plug: Description and Operation

GF15.10-P-2000MIR Component Description For Spark Plugs
ENGINE 272.949 in MODEL 230.454 as of Model Year 09 /Modification Year 08 model refinement package
ENGINE 272.968 in MODEL 230.458 as of Model Year 09 /Modification Year 08 model refinement package
ENGINE 273.965 in MODEL 230.471 as of Model Year 09 /Modification Year 08 model refinement package





Original spark plug shown

R4 Spark plugs

Location
For each cylinder, one spark plug is screwed centrally into the cylinder head from above.

Task
Spark plugs ignite the suctioned and compressed fuel-air mixture due to arcing between electrodes.

Function
The ignition voltage flows from the ignition lines of the directly plugged in ignition coils (T1) to the spark plugs and causes arcing in the air gap between the central electrode and ground electrode.

All spark plug characteristics are defined by type symbols provided by the manufacturer (e.g. heat rating, seat shape, thread, width across flats, electrode material, spark position).