Sync Crank S Count

Overview

Where SS Tooth No = MX Sync test and Sync Tooth = Sync teeth

SS Tooth No is the number of internal crank teeth between cam teeth.

Sync tooth is the value of Fuel tooth at the synchronising cam tooth.

Sync Crank S Count Options

Option Description
option iconSync Crank S Count ON
option iconSync MX OFF
option iconSync Cam Count OFF
option iconSync Cam Width OFF
option iconSync Crank Divider OFF. This option has a major impact on timing interrupts and changing it requires an ECU reset.
option iconMissing Set to 0 since there are no missing / extra teeth.
option iconSync Teeth
option iconMX Sync Test

Examples

Honda S2000

24 even crank teeth per engine cycle with 3 cam teeth at TDC for only 3 cylinders.

  • Tooth Control table is 0-23 = 5, 24 = 3
  • Sync Teeth = don’t care - See channel Sync Tooth or Cam tooth1, the cam tooth for synchronisation relative to crank.
  • MX Sync Test = 12 - See channel SS Tooth No, the number of internal teeth between cam teeth at the synchronising cam tooth, the other possibility 6 is not unique as it occurs twice per engine cycle.

Toyota

24 even crank teeth per engine cycle with 1 cam tooth.

  • Tooth Control table is 0-23 = 5, 24 = 3
  • Sync Teeth = 1
  • MX Sync Test = 24

Simple crank trigger

Edge at 45deg 4 teeth cycle, no cam synchronisation.

  • Tooth Control table is 0-2 = 1, 3 = 5, 24 = 3
  • Sync Teeth = 0
  • MX Sync Test = 4

Adjust ignition range for useful +/45 degrees = 0.5

Ford P8 L8

4 even crank teeth per engine cycle with 2 cam teeth.

  • Tooth Control table is 0-7 = 5, 8 = 3
  • Sync Teeth = don’t care - See channel Sync Tooth or Cam tooth1, the cam tooth for synchronisation relative to crank)
  • MX Sync Test = 6 - See channel SS Tooth No, the number of internal teeth between cam teeth at the synchronising cam tooth, the other possibility 2 is not as strong.
  • Fuel Teeth = 8
  • Spark Teeth = 4 for wasted spark
  • Wheel Teeth = 4