2
For 4,6 and 8 cylinder 4 stroke applications.
Please read the entire manual before beginning installation.
Any text in bold or underlined is especially important and this has been learned from feedback and
troubleshooting from over 25 years in this business.
System Variations
The CPi2 is available in multiple configurations:
Single board ecu driving 1 coil pack on a single plug engine.
Single board ecu driving 1 coil pack in conjunction with a magneto or other ignition on a twin plug engine.
Single board ecu driving 2 coil packs on a twin plug engine. (redundant coilpacks, but non-redundant cpu board).
Dual board ecu for twin plug engines, with each board driving its own coil pack.(fully redundant)
System Description
The CPi2 unit is a microprocessor based ignition unit designed to trigger the supplied waste-spark type coil packs
either with built in ignition drivers or ignition driver modules mounted nearby the coil pack. The CPi2 cannot drive
traditional ignition coils directly without a driver module.
The Cpi2 can automatically switch over to battery backup power if the main 12 volts bus voltage goes above or
below set thresholds, or if 12 volt mainbus power is lost.
Dual board CPi2 units have two identical boards double stacked in one box. The boards do simple communication
between each board and each knows if the other goes offline and can act accordingly. Throughout the manual the
two boards in the Dual board CPi2 are referred to as “A” Primary or “B” Backup. Really they both function the same
at all times, and if one board fails or loses power the other board should keep the engine running. The programmer
display and keypad unit can access each board in the dual board system by pressing the PROG key on the
programmer unit. This is explained in greater detail later in the manual. On Single Board ecu units, the PROG key
serves no function.
Engine spark timing is fully programmable for both RPM and load (manifold pressure or throttle position). Triggering
is accomplished with magnets attached to the crankshaft and a Hall Effect sensor fitted to the engine case. As such,
timing variations relating to gear lash or harmonics are eliminated. Two triggering magnets are used on 4 cylinder,
three triggering magnets are used on 6 cylinder applications, four triggering magnets on an 8 cylinder. One sync
magnet is also used to synchronize the computer with the engine so the computer knows which coil to fire first. As
each magnet passes the Hall sensor, a pulse is sent to the CPi2. The CPi2 determines the exact rpm and manifold
pressure, sums the programmed spark retard values and calculates the appropriate delay for the specific conditions
at that instant, then triggers each coil to fire at the precise time. Each coil fires two cylinders simultaneously, one
cylinder on compression, the other on exhaust.
Once the system has been calibrated using a timing light by setting the MAGNET POSITION value, the gauge1
screen will accurately display the actual ignition timing in degrees BTDC in real time. Programming can then be
accomplished in the simplest possible terms to understand.
Hall sensor
(adjustable type)
Hall sensor Twin Hall sensor for
(non-adjustable type) Dual board CPi2 units
