NGK U3010 / 48085 Ignition Coil Genuine NGK Component Essentially the operating principle is the same for all types of ignition coils whether the classic can-type coil, or in a coil rail system. The device contains two copper wire windings & a laminated iron core. The copper wires are insulated to prevent short circuits. The battery current fed through the primary winding produces a magnetic field whose strength is further increased by the iron core. When this circuit is opened, the magnetic field collapses, inducing a high voltage pulse in the secondary coil.U3 Type Ignition Coil The number of ignition cables corresponds to the number of spark plugs. The NGK ignition coil of the Type U3 is a block ignition coil with two high-voltage outlets. It simultaneously supplies two spark plugs with high voltage through one ignition cable each (double spark technology).BOX DIMENSIONSHeight (mm): 62 Width (mm): 130 Length (mm): 110 If you are unsure as to whether this is the correct part for your vehicle, please don't hesitate to contact us. Alternatively please use the cross reference table above.