RayTechAutomotive
SynchroKing 4 Mk2 - Instruction Manual
www.raytechautomotive.com
3 of 6
Rev 3
Aug 2022
Connections
Diagram 2 shows the SynchroKing 4S Mk2
connected to the battery and inlet manifolds
Figure 2 - Connection Diagram
Function description
Vacuum measurement
The SynchroKing 4S Mk2
displays the vacuum of each individual channel in mmHg with a
resolution of 2mmHg. Values under 20mmHg are supressed and the device will display ' - - - ' for
any suppressed channels. If the channel is suppressed then it will be excluded from the
calculation of the average value of all active channels.
Vacuum differential
The SynchroKing 4S Mk2
calculates the average value of all active channels and compares the
individual value of each channel to this average. The deviation from average is displayed on the
bar graph of the channel. Each bar represents 20 mmHg vacuum differential, whereas the two
middle being lit indicate a pressure differential of less than 20mmHg (i.e the vacuum being
practically the same in both manifolds). See Figure 3 for examples.
Dampening
The SynchroKing 4S Mk2
is equipped with a dampening function to produce a meaningful and
readable display of the vacuum level. The vacuum in the inlet manifold of a running engine will
fluctuate which will result in a rapidly updating readout which makes it virtually impossible to read
the vacuum level. (Equivalent to a rapidly bouncing needle on a conventional gauge).
To overcome this, the dampening function will store the average value of many measurements
into the device memory and produce a display value based on these, resulting in a more stable
readout (equivalent to a choke valve on a conventional gauge). The dampening factor is
