Innovate-motorsports ST-12 Manual do Utilizador descarregar pdf (Página 17)

2. Odd fire engines, like V-Twin motorcycle engines and odd-fire V6 engines have ignition pulses

that are not evenly spaced. For example a 60 degree V-Twin running at 10 degrees ignition

advance will fire cyl. 1 at 10 degrees BTDC. Then fire cyl. Two 420 degrees later at 410 degrees.

Then fire cyl 1 300 degrees later at 710 degrees. This means the ignition pulses sent to the ST-12

are alternating between 420 and 300 degrees apart and therefore the time between pulses

alternates. The ST-12 therefore measures the times between ALL pulses for a complete engine

cycle (2 rotations) and averages the times between them.

5.2.7 Programming the RPM input

- Determine the number of ignition pulses per crank rotation. Refer to Table 2 or 3 for guidance.

- Press the ‘Channel’ button until it shows channel 1.

- Press the ‘Function’ button until it shows 1 or 2. Use 1 if your engine’s redline is below 10000

RPM. Otherwise use 2.

- Press the ‘Calibrate’ button until the selected Cyl. Number appears

Table 2: Cylinder number and RPM calibrate number 4-stroke engine

Number

Cylinders

4-Stroke

pulses/Crank-

Rotation

Calibrate

Number

Comment

1 1/2 1 Use also when using inductive

clamp on spark wire or power wire

of COP system of 1 cylinder only

for all cylinder numbers

2 1 2 Use also when using inductive

clamp on spark wire or power wire

of Waste spark coil of 1 cylinder

only.

Waste spark system:

1 coil for every 2 cylinders.

3 1-1/2 3

4 2 4

5 2-1/2 5

6 3 6

8 4 8

10 10 A

12 12 C

Table 3:: Cylinder number and RPM calibrate number 2-stroke and Rotary Engine

Number

Cylinders

2-Stroke

pulses/Crank-

Rotation

Calibrate

Number

Comment

1 1 2 Use also when using inductive

clamp on spark wire or power wire

of COP system of 1 cylinder only

for all cylinder numbers

Also use for rotary engine.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 32 33

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