MoTeC M880 - Manual (Page 32)

30 Installation
Duty Cycle
The Injector Duty Cycle is a measure of the ratio of the time the injector is
open (pulse width) to the available time per engine cycle. For example if the
injectors where on for half the available time then the duty cycle would be
50%.
The maximum allowable duty cycle is about 85 percent, beyond this the
injector does not have time to open and close and is therefore open
continuously and cannot deliver more fuel.
The ECU will set a Diagnostics Error if the duty cycle exceeds the maximum
allowed duty cycle.
Ignition System
Ignition System Types
Many different types of ignition systems are available with some better suited
to different applications than others.
CDI Distributed
CDI systems are suited to high revving engines with 8 or more cylinders and
are generally capable of at least 12,000 RPM on an 8 cylinder. CDIs are also
good at firing fouled plugs.
HEI Distributed
High Energy Inductive (HEI) distributed ignition systems are generally limited
to about 8000 RPM on an 8 cylinder engine but will run a 6cylinder to 11,000
RPM and a 4 cylinder to 15,000 RPM.
Most modern road cars run HEI ignition systems that are equally well suited
to high performance engines as long as the above RPM restrictions are
observed.
Multi Coil (HEI or CDI)
HEI or CDI multi coil systems will generally run any engine to 15,000 RPM.
Two types of Multi Coil systems are possible :