11
MEASURING STATIC ANGLE
Measuring correct static angle is very important. Wrong static angle will cause inaccurate
ignition advance. If static angle is programmed larger than mechanical static angle ignition
advance will be smaller than programmed, or vice versa.
The most accurate procedure of measuring static angle is with dial gauge and strobe light.
Procedure applies to single and multiple cylinder engines. If you have a multi cylinder engine
with multple pickups it is recommended (but not required) that you perform this procedure on
each cylinder/pickup pair for most accurate timing.
Necessary tools:
- strobe light
- dial gauge
Follow the procedure:
Measure approximate static angle with a degree wheel, just to have starting point...look at the
drawing below.
Counterclockwise rotation:
TRIGGER POINT
TDC
static angle
0,5mm
Clockwise rotation:
TDC
0,5mm
TRIGGER POINT
static angle
。
program CDI with measured approximate static angle
。
program CDI with flat ignition curve...16deg advance is suitable for most engines.
。
find information about engine stroke and conrod length
。
convert programmed flat ignition advance angle to millimetres
Example:
α
=16deg (ignition advance)
L=110mm (conrod length)
R=54/2=27mm (engine stroke divided by 2)
T=1,3mm (calculated ignition advance in mm)
