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An ignition coil includes a low voltage terminal for connection with a battery and a high voltage terminal for connection with a spark plug. An assembly of windings interconnects the terminals. The ignition coil further includes a case containing the windings and the terminals. The case is configure

An ignition coil includes a low voltage terminal for connection with a battery and a high voltage terminal for connection with a spark plug. An assembly of windings interconnects the terminals. The ignition coil further includes a case containing the windings and the terminals. The case is configured for use with a cylinder head cover having a cylindrical bore with a key projecting radially inward of the bore. A cylindrical portion of the case has a central axis, a rotational locator surface, and an insertion guide groove configured to receive the key in the bore. A helical section of the groove is configured to receive the key when the case is in a first rotational orientation. The helical section is further configured for the rotational locator surface to move into abutment with the key upon rotation of the case from the first rotational orientation to a second rotational orientation.

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1. An apparatus for use with a spark plug, a battery, and a cylinder head cover having a cylindrical bore with a key projecting radially inward of the bore, the apparatus comprising: an ignition coil having a low voltage terminal configured for connection with the battery, a high voltage terminal co

1. An apparatus for use with a spark plug, a battery, and a cylinder head cover having a cylindrical bore with a key projecting radially inward of the bore, the apparatus comprising: an ignition coil having a low voltage terminal configured for connection with the battery, a high voltage terminal configured for connection with the spark plug, windings interconnecting the terminals, and a case for the windings and the terminals;wherein the case has a cylindrical portion with a central axis, a rotational locator surface, and an insertion guide groove configured to receive the key in the bore;wherein the groove has a helical section configured to receive the key when the case is in a first rotational orientation, and the helical section is further configured for the rotational locator surface to move into abutment with the key upon rotation of the case from the first rotational orientation to a second rotational orientation. 2. An apparatus as defined in claim 1 wherein the case is configured to interlock with the head cover in the second rotational orientation. 3. An apparatus as defined in claim 2 wherein the groove further has a lock section reaching axially from the helical section, and the lock section is configured to receive the key from the helical section in an interference fit upon movement of case axially when in the second rotational orientation. 4. An apparatus as defined in claim 1 wherein the low voltage terminal has a predetermined alignment with the head cover when the case is in the second rotational orientation. 5. An apparatus as defined in claim 1 wherein the groove is configured for the case to rotate an amount equal or substantially equal to 120 degrees from the first rotational orientation to the second rotational orientation. 6. An apparatus as defined in claim 5 wherein the case has multiple rotational locator surfaces, and the groove is one of multiple insertion guide grooves, each of which corresponds to a respective rotational locator surface and is configured for the case to rotate an amount equal or substantially equal to 120 degrees from the first rotational orientation to the second rotational orientation. 7. An apparatus as defined in claim 6 wherein the grooves are uniformly spaced apart circumferentially about the axis. 8. An apparatus as defined in claim 6 wherein the grooves consist of three grooves. 9. An apparatus as defined in claim 6 wherein the grooves include multiple grooves having a common width and a single groove having a greater width. 10. An apparatus as defined in claim 1 wherein the groove has an open end configured to receive the key upon movement of the case axially when in the first rotational orientation, the groove further has a linear entry section reaching axially from the open end to the helical section, and the helical section reaches circumferentially and axially from the entry section to the rotational locator surface. 11. An apparatus for use with a spark plug and a battery, the apparatus comprising: a cylinder head cover having a cylindrical bore with a key projecting radially inward of the bore; andan ignition coil having a low voltage terminal configured for connection with the battery, a high voltage terminal configured for connection with the spark plug, windings interconnecting the terminals, and a case for the windings and the terminals;wherein the case has a cylindrical portion with a central axis, a rotational locator surface, and an insertion guide groove configured to receive the key in the bore;wherein the groove has a helical section configured to receive the key when the case is in a first rotational orientation, and the helical section is further configured for the rotational locator surface to move into abutment with the key upon rotation of the case from the first rotational orientation to a second rotational orientation; andwherein the case and the head cover are together configured for case to interlock with the head cover in the second rotational orientation. 12. An apparatus as defined in claim 11 wherein the low voltage terminal has a predetermined alignment with the head cover when the case is in the second rotational orientation. 13. An apparatus as defined in claim 11 wherein the groove further has a lock section reaching axially from the helical section, and the lock section is configured to receive the key from the helical section in an interference fit upon movement of case axially when in the second rotational orientation. 14. An apparatus as defined in claim 11 wherein the groove is configured for the case to rotate an amount equal or substantially equal to 120 degrees from the first rotational orientation to the second rotational orientation. 15. An apparatus as defined in claim 14 wherein the head cover has multiple keys projecting radially inward of the bore, the case has multiple rotational locator surfaces corresponding to the multiple keys, and the groove is one of multiple grooves, each of which has a helical section corresponding to a respective rotational locator surface, and each helical section is configured for the case to rotate an amount equal or substantially equal to 120 degrees from the first rotational orientation to the second rotational orientation. 16. An apparatus as defined in claim 15 wherein the grooves are uniformly spaced apart circumferentially about the axis. 17. An apparatus as defined in claim 15 wherein the grooves consist of three grooves. 18. An apparatus as defined in claim 15 wherein the grooves include multiple grooves having a common width and a single groove having a greater width. 19. An apparatus as defined in claim 11 wherein the groove has an open end configured to receive the key upon movement of the case axially when in the first rotational orientation, the groove further has a linear entry section reaching axially from the open end to the helical section, and the helical section reaches circumferentially and axially from the linear entry section to the rotational locator surface. 20. An apparatus as defined in claim 19 wherein the open end of the groove is circumferentially wider than the entry section.