Haltech E8 User Manual
Page 28
Haltech E11/E8 Instruction Manual
Firing Order
The firing order table is filled out with respect to cylinder number 1. Here are some examples of common
engine firing orders:
4 Cylinder 4 stroke Piston
1st Cylinder to fire
1
2nd Cylinder to fire
3
3rd Cylinder to fire
4
4th Cylinder to fire
2
8 Cylinder 4 stroke Piston
1st Cylinder to fire
1
2nd Cylinder to fire
8
3rd Cylinder to fire
4
4th Cylinder to fire
3
5th Cylinder to fire
6
6th Cylinder to fire
5
7th Cylinder to fire
7
8th Cylinder to fire
2
Firing Angles
To cater for ‘odd fire’ engines, certain triggers make use of the firing angles. To configure the firing angles,
type in the angle at which the cylinder fires with respect to cylinder number 1. This means that Cylinder 1
Angle will always be zero.
Example:
If you have an ‘even fire’ 4 cylinder engine with firing order 1-3-4-2, then the angles will be:
Cylinder 1 Angle = 0
Since the angles are with respect to cylinder 1, the definition means that
this angle must be zero.
Cylinder 3 Angle = 180 With an even fire engine, all angles between all cylinders are always
evenly spaced. Therefore, for a 4 cylinder engine will have 720/4=180
degrees between cylinder events. Since cylinder 3 is the next to fire, it will
be 180 away from cylinder 1.
Cylinder 4 Angle = 360 Cylinder 4 will fire 180 degrees after cylinder 3, therefore it fires 360
degrees after cylinder 1.
Cylinder 2 Angle = 540 Cylinder 2 fires 180 degrees after cylinder 4, therefore it fires 540 degrees
after cylinder 1.
For even fire engine applications (most engines) the cylinder firing angle does not need to be calculated
by hand, simply press the “auto generate firing angles” button on the setup page and the correct firing
angles will be generated. It is only in the case of an odd fire crankshaft that the firing angles need to be
hand generated (ie where the angle between each cylinders TDC is not constant).
Page: 28
Copyright © Haltech 2008
6 Cylinder 4 stroke Piston
1st Cylinder to fire
1
2nd Cylinder to fire
5
3rd Cylinder to fire
3
4th Cylinder to fire
6
5th Cylinder to fire
2
6th Cylinder to fire
4