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3W 170xi B2 / TS / CS Engine Manual

through the cylinder(s) fins. The freely flowing, but directed and turbulent air between the fins

provides the maximum cooling for an air cooled engine. Without baffling (meaning wood or

composite dampers that direct the airflow) the air will take the path of least resistance. Some

incoming air will bounce off the cylinder(s) and the rest will escape around the cylinder(s) without

coming into contact with the cylinder(s).

Engine in pusher operation:

Important note! When engines are used operating in pusher configuration cooling gets critical and

special attention has to be given to an effective cooling method. A good cooling system layout

depends on the actual location (position) of the engine in the fuselage.

Operating temperature

The normal operating temperature range for your engine is 176-212 Fahrenheit (80-100 Celsius).

If the temperature of the engine rises above 230 degrees Fahrenheit the engine is in an overheated

condition where sealed ball bearings and needle bearings could be damaged. Further, you risk

an elongation of the heated engine parts, and / or having an oil film build up, which could lead to

a seized piston or pistons. Following the instructions and recommendations in this manual will

keep the engine operating comfortably within the normal temperature range.

Rear induction

Carburetors, whether front or rear, require a steady supply of fresh air. The best way to supply

air to a rear carburetor is by installing an air scoop. Some have thought to drill holes into the

fuselage near the carburetor area rather than creating an air scoop for the carburetor. This does

not work, it fact it will create a vacuum effect that will draw the air away from the carburetor! Again,

you should install an air scoop into the front of the plane which will supply air into the fuselage.

This air will then need to flow out of the fuselage. Drill exit holes into the rear area of the fuselage

for this purpose. Important: The interior of the fuselage must be sealed to prevent damage from

gasoline that sprays from the carburetor. Use a thin epoxy or other appropriate fuel proofing

method. Do not overlook this step as gasoline will melt some materials like Styrofoam very quickly.

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