System Connected to Lyc I/O 360 in a Cardinal RG.
Display is showing 9.8% RH. The RH controller activated the pump shortly after this photo was taken.
System Connection for a Typical Fuel Injected Lycoming
Return air enters on the right side of the black system case, and is pumped out the left side and into the desiccant bottle. The desiccant bottle is clear so it is easy to see the condition of the indicating silica beads. Dry air exits the top of the bottle and is fed into the engine.
The system had run the pump since the prior picture and now indicates 5.8%.
The connection to the oil dipstick tube is a nylon threaded fitting that screws directly into the dipstick tube.
Outside humidity was starting to feed in through the open return air line, bringing the RH up to 7.7%.
The two lines feeding dry air into the engine. The line with the "T" feeds dry air into the exhaust and into the intake air plenum drain line. The line without the "T" feeds dry air into the crankcase vent line.
Line feeding air into the crankcase vent line (on the left) is fed about 18" up into the crankcase vent pipe to insure an air tight fit. The line on the right connects to the small diameter drain line for the intake air plenum. The other drain line to the far right is the drain line for the fuel pump, it needs no dry air connection.
Connecting the System to the Engine
System Sensitivity Demonstration
(Note: The test box on the right is displaying RH.)
This video also demonstrates that the inside of the engine is maintained at a very low humidity level.
When the system first turns on, the RH display immediately starts to decline, showing that the air coming from the dipstick tube is at or below the level displayed on the system.