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The
K&B .82 cu. in. DF is a high-performance ABC type engine,
designed especially for ducted fan models. It is powerful,
rugged, and dependable, and will provide countless hours of
sport, or competition performance if properly handled and
maintained.
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SPECIFICATIONS
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Displacement
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.8155
Cu. In. (13.4cc) |
Bore
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1.040
(26.42mm) |
Stroke |
.960
(24.38mm) |
R.P.M. |
2,000
- 23,000 |
Power
Output |
4.2
HP @ 23,000 |
Weight |
23.0
Oz. (652g) |
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WARNING
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PLEASE
READ ALL SAFETY
INSTRUCTIONS! Failure to read, understand and follow
these instructions could result in personal injury and/or
property damage to yourself or others.
Take
a few moments to familiarize yourself with the various parts
of the engine. DO NOT DISASSEMBLE YOUR ENGINE! Doing so will
void your warranty. No exceptions!
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BREAK-IN
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1.
Do not run this engine on a test stand. Nothing can be gained
by so doing as you only expose yourself, and others, to possible
injury from the spinning rotor.
2.
Mount the engine in accordance with the instructions supplied
with the ducted-fan unit you may choose to install in your
model. Make sure that it is accurately aligned and firmly
bolted in place.
3.
After the complete system is installed in the airplane and
all of the connections are secure and functioning, you are
ready for your first engine/fan run-up.
4.
Prime the engine and turn it over once, by hand, before applying
the glow plug battery, or the electric starter. (It is recommended
that you have a helper hold the model while you are starting
the engine). Start the engine with the throttle in the idle
position. Avoid long periods of electric starter use. If the
fuel and ignition are correct, the engine will start instantly.
As soon as the engine fires, remove the starter and allow
the engine to warm up at half throttle before removing the
battery power from the glow plug.
5.
For the first run DO NOT run at full throttle
for more than a few seconds. Use this run to adjust the low
and mid-range setting on the carburetor. (See carburetor adjustment).
When you are satisfied that the carburetor settings are correct,
it is recommended that you run two or three tanks of fuel
through the engine, at a slightly rich setting, before attempting
your first airborne run. When you are sure that the engine
will hold full power, you are ready for your maiden flight.
However, to be on the safe side (to prevent possible sagging
of RPM due to the engine not being fully broken in), you can
achieve 98% full power with a slightly rich setting, which
should not impair the flying of the model.
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OPERATING
INSTRUCTIONS
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If
you are unfamiliar with this line of carburetors or are a
new modeler, please do not attempt to start the engine until
you have read and understand the following instructions:
The
carburetor enables easy adjustment of the idle speed, idle
mixture and the high speed mixture.
1.
HIGH SPEED NEEDLE VALVE
Locate
an area to install the Remote Needle Valve Assembly using
the bracket provided. This may typically be attached to
the firewall, cowl, or rear engine mount lug area. This
assembly must be in the fuel line between the tank and the
carburetor. The line should not exceed five (5) inches in
total length.
2.
HIGH SPEED NEEDLE VALVE ADJUSTMENT
This
needle valve, located on the Remote Needle Valve Assembly,
controls all the fuel that comes to the engine, whether
the engine is running at high, mid-range, or idle-speeds.
It does not affect the low speed rich/lean setting. The
High Speed Needle Valves main function, however, is
to meter the high-speed fuel mixture.
As
a starting point for the High Speed Needle Adjustment, completely
close the needle valve (clockwise), then open it (counter-clockwise)
three and a half turns. This setting is an average and may
require further adjustments. For higher altitudes (3,000
- 4,000 feet), close the needle valve approximately 1/2
turn.
3.
LOW SPEED and MID-RANGE ADJUSTMENT
The
rich/lean adjustment is controlled by the brass low speed
disk located on the side of the carburetor. Using the allen
wrench provided, turn the disc clockwise to lean
the mixture and counter-clockwise to richen
the mixture. The rich/lean mixture control is set at the
factory and may require only a fine adjustment for your
application. WARNING: DO
NOT RUN THE ENGINE AT A LEAN SETTING.
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PRESSURIZED
SYSTEM
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All series
94 carburetors must run with exhaust pressure from
the pipe to the fuel tank. |
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FUEL
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We recommend
the use of K&B 515 DF fuel which is specifically blended
for Ducted Fan usage. Use of inexpensive, or poorly mixed fuels
will seriously detract from the life of this engine. We also
recommend the use of an after-run oil, such as Zap, Marvel Mystery,
or automatic transmission fluid for protection of the bearings,
and other steel components in the engine, after each days
flying, or while it is not being used for some time. |
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TUNED
PIPE AND EXHAUST PRESSURE PIPE
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The Exhaust
extension supplied with this engine will work with most tuned
pipes available. However, the tuned pipe most recommended
to us (by those who have been running the K&B .82s)
is the MAC 10-13cc tuned pipe. The pressure tap fitting should
be located in the center of the highpoint of the tuned pipe
and routed to the fuel tank with a medium size silicone fuel
line.
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FUEL
SYSTEM/FUEL PRESSURE
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Should
you utilize either a large single tank or twin tanks with or
without a hopper/surge tank, please make sure you have a constant
fuel supply to the carburetor. If you use Pitot
pressure, remember the pressure drops as the fan speed reduces,
which can cause a lean condition. You may require larger lines
on the pressure side or your system. If you have a large capacity
fuel system, the pressure drops as fuel is replaced with air,
which can cause a lean condition. An in-flight needle valve
assembly (such as K&B P/N 9275) is recommended for use if
you are unsure of your fuel delivery system. |
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GLOW
PLUGS
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Glow
plug life is a function of time and of how hard you run the
engine. Lean runs are the quickest way to burn out a glow plug.
This engine is equipped with a No. 7311 KB-IL which is a hot-type
racing plug. There are many good colder glow plugs available
so you should experiment to find one that you feel is most effective.
Head shims are available and may be used under different atmospheric
conditions, and for different fuels that can affect the glow
plug life. |
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©
Model Engine Corporation of America, All rights reserved.
K&B and the oval logo are Registered Trademarks of Model Engine
Corp. of America
Registered U.S. Patent Office
No
part may be reproduced without written permission from
MECOA/K&B -- P.O. Box 5 -- Sierra Madre, CA 91025 U.S.A.
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