 | BACK FIRING : If you are having
trouble with your engine back firing and kicking off the propeller or spinner, try cutting
a washer out of emery cloth. Put this emery cloth washer behind the propeller or spinner
back plate, and tighten the propeller nut normally. This solves the problem even for
cantankerous four-cycle engines.
BEARINGS: (1) To avoid buying expensive
ball bearings is prevent ruining the ones that came with the engine. At the end of the
flying day, run the engine up to operating temperature, then disconnect the fuel line in
order to run the engine completely out of fuel. Remove the glo plug and dump Marvel
Mystery Oil into the carb until turning the engine over (with a starter) sprays the after
run out the glo plug hole. This usually takes two or three good streams of oil into the
carb.
Model Engine
Bearing Installation
CLEANERS : Put about three ounces
of automotive fuel injection cleaner into a gallon of fuel. It is said to remove varnish
and carbon from the engine.
CARBURATOR AIR LEAKS (1) : Carburetor Air Leaks
- Stopping Airleaks in the Carb.
CARBURATOR FLUSHING (1) : Flushing Your Carburetor
- Carb cleaning at the flying field.
COOLING (1) : Fuel-Cooled Engines??
- In a Sense -- Yes, They ARE!
CONVERSIONS (1) : Weedwhacker Engine Conversion
ENGINE AIR LEAKS (2): Engine Airleaks -
Airleaks: Cause and Effect
Engine
performance database
ENGINE MAINTAINCE : - Maintenance of
4-Stroke Model Engines - How to care for your 4-stroke model engine presented in French. By Oliver Rogeau.
Nitrorc.com
NitroReview.com
ENGINE MODIFICATIONS (1) :
Engine
Modifications - by Steve Jahr
ENGINE REPAIR (1) : A broken
metal engine mount or similar member can often be repaired and returned to original
strength with a product called J.B. WELD. This is a type of epoxy that is
very strong and will withstand high temperatures. Use in accordance with the directions
and you won't be disappointed. It is available at most hardware and auto parts stores.
ENGINE RUN-IN (1) : Engine Run-in
ENGINE TUNING (1) :
Vins Two-Stroke Page - How to tune your engine, with a lot of links.
GLOW PLUGS (2) :
Glowplugs
- Why They Fail
Glow to Electric Conversion
Fox Manufacturing Company Has been manufacturing Control Line and
Radio Control Engines and related accessories for almost 50 years. Their glow plugs are
among the most popular used today. The nice people at Fox have graciously permitted ECMC
to reprint the following article from their Catalog. Perhaps it will help you if you are
having problems with failing glow plugs. Glow Plug Problems . . . Today's glow plugs,
whether it be ours or a competitor's, are well made products, and they should give you
good service. Although the life of a glow plug is unpredictable, you should reasonably
expect a dozen or more flights out of one. If you have a motor which seems to eat glow
plugs, the probability is that it is suffering from one of the following three causes:
Overheating — A glow plug coil will melt if it gets too hot. Reasons why this
happens vary. Sometimes the combination of running a motor wide open with a lean setting
before you take the glow plug heater off is too much for the element. Quite often people
use a power panel which has a built-in surge characteristic, which results in momentary
over-voltage when the plug is first switched on. When a glow plug fails due to
overheating, the end of the element wire has a tear drop shape. Unless you have very
unusual eyes, you cannot detect this without the aid of a microscope or magnfying glass.
We use a 20 power microscope which brings it up where you can plainly see the end of the
break.
Vibration — If the engine is not rigidly mounted and can move around very
much, the element is shaken from side to side with tremendous "G" forces. This
literally fatigues the metal until it breaks. When you look at the end of the element wire
break through a microscope it has a jagged, rough type appearance. The only solution is to
increase the rigidity of your engine mount.
Shock Wave — Most model engines use a steel or brass liner mounted on top of a
cast aluminum case. As the engine gets older, the liner flange works its way down into the
case and lowers the head with it. When the piston clearance gets down to about .010, air
is forced out of the squish band area with supersonic velocity and the action on the glow
plug element is like when a jet plane zooms over your house and knocks out the windows.
The cure here is to raise the head with another head gasket. Less often, reasons why glow
plugs sometimes fail are:
Cranking the engine when it is flooded. This sprays raw fuel onto the plug and the
droplets beat the element over to the side of the housing where it shorts out.
Another problem that occasionally occurs is that motors sometime take to wearing
abnormally, such as a cracked crankshaft chewing metal out of the bearing, or a connecting
rod that is chewing metal. Of course, when this metal goes up and deposits on the plug
element, the plug burns out.
Fox Manufacturing Company, 5305 Towson Avenue, Fort Smith, Arkansas
72901 Posted with permission of Jim Ewing
.
NOISE REDUCTION (1) :
NOISE
REDUCTION - MODEL AIrcRAFT
THROTTLE ADJUSTMENTS (2) : Adjusting the Throttle
- It's Tough. Some Help Here!
Throttle Valve Adjustment
- by Howard Sullivan
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