Engine-dryer-kit

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.

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 desiccant         AGM Clay CaSO4

Lid drill pattern template
Purge valve housing
¾” Silicon SCUBA check valve
60W lamp
Lamp socket
Hollow lamp socket bolt
(1/8 pipe & nuts)
Screws washers
120V Power outlet (split)
Blue Box housing
Power cord flying lead Q106-ND
3/16”Brass tubing    1” stub inlet tube
3/16”x 7” Brass tubing delivery tube w/
Humidity sensor* (custom design)

Full complement kit (all components)
Price $90 Plus $14 Shipping via USPS
(US address only) Canadian shipping is
approximately double this amount and will
be billed additionally..
Order from: www.barkeraircraft.com

You will also need:
46 oz wide mouth glass pickle jar w/ lid
Soldering iron
Solder
RTV glue
Hand tools
Fabricate your own air   return adapter

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
3.6K
100K
39K
10K
6.8K
4.3K* Select
1K
Select resistor
100 ohms
Capacitors
0.01uF
0.1uF
180 pF
*Humidity sensor BARC