The position for the SiCOMS® sensors and SOG in the engine wall must be chosen
carefully. Using existing drilled holes, for example used by an old oil mist detection
system, the installation is easy.
Anyway, the splash oil concentration inside the engine is a very important factor
and must be taken into consideration:
Each engine type has got its own characteristics which influence the splash oil
concentrations inside the engine. The areas of high splash oil concentration “follow”
the rotation of the crankshaft. During engine work splash oil forms discoidal zones
with very high splash oil concentration (also called “splash discs”).
In an in-line engine two “splash discs” appear between the con rod and the crankweb.
In a V-engine a third “splash disc” appears between two con rods.
It is important to choose the installation position outside the “splash discs”!
In a four-stroke engine the sensors must be installed on the side where splash oil
hits the sensors on the top. Otherwise, the SiCOMS® Diffusor has to be installed to
the SOG.
Two-stroke engines have no definite rotational direction, so the splash oil is not
always hitting the top of the SOG! Also the other different characteristics of an twostroke
engine compared to a four-stroke engine require the usage of the Diffusor
on two-stroke engines!
In Fig. 5.1. you can see an example for installation for a four-stroke diesel generator
set. The left top position of the crankcase was found here the best for oil mist
monitoring.
