Fully Automatic Engine Dryer
Closed Loop Kit
Cheap Insurance to help get your
aircraft engine to its rated TBO
If you own an aircraft engine --- then,
You need this now!!!!
Closed Loop Kit
Cheap Insurance to help get your
aircraft engine to its rated TBO
If you own an aircraft engine --- then,
You need this now!!!!
Life Support for Aircraft Engines
Air fitting for engine oil filler cap
How it works, Summary
Continental and Lycoming typically rate their engine life from 1600 to 2000 hours of operation between
overhauls on most models. However, the only owners likely to achieve that kind of rated performance are
those who use their aircraft on a nearly daily basis. Why? The reason is not the flying. It is the parking!
A primary culprit for premature aircraft engine overhaul is corrosion caused by condensation within the
engine cavity that occurs after shutdown. Aircraft engines that are used daily frequently reach their rated
TBO because liquid condensate is boiled off on a regular basis. Low use rate often results in reduced engine
life. As the engine cools and the internal temperature drops below the dew point, liquid moisture condenses
out of the vapor and clings to internal engine surfaces. This liquid water then resumes its ongoing process
of eating up your engine from the inside out. However, if the dew point can be made sufficiently low, then
liquid water will never form. The engine dehumidifier provides a continuous positive pressure injection of
extremely dry air on a 24/7 continuous flow basis. Any moisture in the crankcase air is recovered from the
blow-by vent and returned to the dryer. Passing over the silica gel removes any residual moisture. When the
desiccant saturates, the humidity sensing electronics turn off the air pump, turns on a heat lamp in the
desiccant and opens a purge valve to the outside ambient environment. The desiccant is heated to ~ 200 F .
As moisture is driven of the humidity falls and the electronics restart the engine drying process.
overhauls on most models. However, the only owners likely to achieve that kind of rated performance are
those who use their aircraft on a nearly daily basis. Why? The reason is not the flying. It is the parking!
A primary culprit for premature aircraft engine overhaul is corrosion caused by condensation within the
engine cavity that occurs after shutdown. Aircraft engines that are used daily frequently reach their rated
TBO because liquid condensate is boiled off on a regular basis. Low use rate often results in reduced engine
life. As the engine cools and the internal temperature drops below the dew point, liquid moisture condenses
out of the vapor and clings to internal engine surfaces. This liquid water then resumes its ongoing process
of eating up your engine from the inside out. However, if the dew point can be made sufficiently low, then
liquid water will never form. The engine dehumidifier provides a continuous positive pressure injection of
extremely dry air on a 24/7 continuous flow basis. Any moisture in the crankcase air is recovered from the
blow-by vent and returned to the dryer. Passing over the silica gel removes any residual moisture. When the
desiccant saturates, the humidity sensing electronics turn off the air pump, turns on a heat lamp in the
desiccant and opens a purge valve to the outside ambient environment. The desiccant is heated to ~ 200 F .
As moisture is driven of the humidity falls and the electronics restart the engine drying process.
Air plumbing schematic
Plenum Purge Valve
Humidity Electronics Schematic
Bill of materials for the automated dryer kit
(Original kit components)
Air pump
Tygon tubing 10 ft.
Engine air inlet connector. (brass)
Air stone (dust filter)
1 lb Silica Gel
Lid drill pattern template
Purge valve housing
¾” Silicon SCUBA check valve
Valve linkage 3/32’ brass tube
& Aluminum lever linkage
PC mounting hardware
2 ea #4 screw
4 ea #4 washers
60W lamp
Lamp socket
Hollow lamp socket bolt
120V Power outlet (split)
Power cord flying lead Q100-ND
3/16”Brass tubing 1” stub inlet tube
3/16”x 7” Brass tubing delivery tube w/
Humidity sensor* (custom design)
#22 hook up wire
Full complement kit (all components)
You will also need::
Soldering iron
Solder
RTV glue
Hand tools
Fabricate your own air return adapter
(if used)
Price $$110 includes Shipping via USPS
Order from: www.barkeraircraft.com
Bill of materials for the automated
dryer kit (Continued)
All electronic components including:
120VAC to 12VDC power supply module
PC Board humidity controller
LM555 timers (2) .
LM358 Op –Amp
HRF3205 FET transistor
DPDT relay* (12V coil)
K10P-11D15-12
Resistors
1 Meg
100K
10K
6.8K
10K Trimpot
1K
100 ohms
Capacitors
0.01uF
0.1uF
*Humidity sensor BARC
AUTOMATIC DRYER KIT
PRICE $110 INCLUDES SHIPPING
PRICE $110 INCLUDES SHIPPING
Dryer and air pump
Control electronics
