The clever item number
The NGK ignition coil programme is divided into six categories. These provide information about the type of coil - and thus the number of optionally available ignition coils and ignition cables.
Each item number is comprised as follows:
U = NGK ignition coil
1 = Category
000 = Consecutive number
U1: Distributor ignition coil
One ignition coil per vehicle
Number of ignition cables corresponds to the number of spark plugs
In addition, a cable to the distributor is required.
The NGK Type U1 ignition coil supplies the spark plugs with high voltage through a mechanical ignition distributor.
U2: Block ignition coil
The number of ignition cables corresponds to the number of spark plugs
The NGK ignition coil of the Type U2 is a block ignition coil, which supplies multiple spark plugs with high voltage through ignition cables. Normally, one ignition coil is required per cylinder head
U3: Block ignition coils with two high-voltage outlets
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").
U4: Pencil coils with double-spark technology
One ignition cable is required for each coil
The NGK ignition coil of the Type U4 is a pencil coil with double spark technology. As a poloidal coil or coil-on plug, each provides two spark plugs with high voltage
U5: Pencil coil with single spark technology
No ignition cables are required
The NGK ignition coil of the Type U5 is a pencil coil with single spark technology. One such ignition coil is attached at each cylinder
U6: Individual ignition coils for each cylinder in the complete system
Normally, no ignition cables are required
NGK ignition coils of the Type U6 are complete systems in which multiple ignition coils for each individual cylinder are comprised in a complete system