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Formulary Dwell phase


RPM and dwell angle in an ignition with Hall sensor control



The necessary values can be read off from the oscilloscope display. The engine RPM is the number at the top right hand side. The signal from the Hall sensor leads us quite simply, to the dwell-angle.

The smaller the ignition interval is, the shorter the dwell-phase is.


Four stroke

Two stroke

t =


n · 3

t =


n · 6

n =


t · 3

n =


t · 6

= n · t · 3

= n · t · 6

Check your calculation!     You need help?
Please enter numbers only in two of the three fields!
Dwell angle ° (grad)
n RPM 1/min
t Dwell phase s
Four-stroke engine Two-stroke engine



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