For your safety - Your engine is not a toy!
• You will be working with highly flammable fuel, so keep it away from exposed flames or
any thing which might ignite it. Read the safety info on the fuel container.
• Do not use fuels that were not designed for glow plug engines.
• Keep the fuel out of reach of children!
• Deadly carbon monoxide gas will be released, so do not operate the engine in an enclosed area
where exposed flames or sparks can ignite it, or where it causes you to inhale it for prolonged
periods.
• During operation, the engine may be dangerously hot to the touch.
• Do not use the engine for purposes other than in model cars designed for them.
• Mount the engine securely.
NITRO ENGINE INFORMATION
Mac Star 28
IMPORTANT - READ THIS BEFORE
STARTING YOUR ENGINE!
Before Starting Your Engine
Oiling the filter
The air filter is essential for keeping dirt out of the engine. A foam
filter must be oiled before running the engine. We recommend using
Associated AS7710 foam pre-filter treatment. Dab the treatment all around
the filter, put the filter in a plastic bag and knead it until the filter is
saturated, but not soaked. NEVER RUN YOUR VEHICLE WITHOUT THE AIR
FILTER.
Adjustments
Your engine has come factory set to allow for an easy start and rich
running . DO NOT alter any of the settings until the running in period
has been completed.
Putting fuel in the fuel tank
Squeeze the fuel bottle, put the bottle’s tube into your fuel container,
and draw out some fuel. Lift up the lid on the fuel tank, and slowly
squeeze the fuel bottle until the tank is full. Be careful here. If you
overflow the tank it might get on your radio gear or on your brakes and
you may create an unsafe driving situation. Always keep your fuel bottle
closed when not in use.
Understanding the engine terms “rich” and “lean”
Your carburettor has screws that regulate how much air and fuel enter
the engine together, the air/fuel mixture. An air/fuel mixture that is too
“rich” means there is too much fuel, and a mixture that is too “lean”
means that there is not enough fuel for the given amount of air. When the
mixture is too rich, performance will be sluggish (one symptom of this, is
excessive amounts of smoke from the exhaust). There is also a potential
to foul the glow plug when the mixture is too rich. When the mixture is too
lean, there is not enough fuel to cool or lubricate the internal engine
components, and damage to the engine and/or glow plug is almost
certain.
CAUTION:
If, while you are driving, the engine stalls because of an overheating
condition, severe damage may have already occurred. Overheating is
caused by the following conditions.
• Fuel mixture is set too lean
• Air leak around carb
• Loss of muffler pressure (line falls off)
• Excessive nitro content in the fuel
• Incorrect oil content in the fuel
• No air filter
• Poor quality of fuel
• Contaminated fuel
• Excessive loads on the engine (locked drivetrain)
Your engine will be short-lived if any of the above conditions are
allowed to exist for any length of time.
During the first few tanks watch closely
for any signs of overheating. These will include:
• Steam or smoke coming from the engine surfaces
• Cleaning out and then lagging during high-speed acceleration, as if it
is running out of fuel.
• Popping or clattering sound when slowing down.
Idle speed will surge or possibly diminish to the point of stalling.
To Test For Overheating
It’s important to check the head temperature during the operation of
the engine. The best method for checking the head temperature is to use a
head temperature gauge. There are several head temperature gauges
available, and the temperature readings between these different brands of
gauges vary. Due to this variance , the temperature readings will range
between approximately 185 degrees and 225 degrees. About 185 degrees
is the normal for the Hyper 21. If you don’t have access to a head
temperature gauge, you can use water to check the head temperature.
Place a drop of water on top of the cylinder head. If it sizzles away
immediately, shut down your engine. If it takes approximately 3-5 seconds
for the water drop to boil away, then the engine is running within a normal
temperature range.
Start Your Engines
Running-In
The modern model car engine requires relatively little running in, due
to the use of ABC piston and liner assembly. The engine should be run on
a rich setting for approximately 6-8 tanks of fuel, with another 6-8 at a
slightly less rich setting. Once this has been completed, the internal
engine components should be properly seated and a normal setting can
be used. A good idea is to use a running in fuel for this purpose, as it is
especially designed for breaking in new engines without damage.
The best methods of checking on the running setting of the engine, is
to first check the smoke trail coming out of the exhaust with the car is
running. A very rich setting would allow the car to pull away slowly or
slugglish with a momentary hesitation and lots of smoke from a standing
start. When the car is accelerating at full throttle, the engine will never
“Clean Out”. When an engine cleans out, the speed and the rpms will
increase suddenly and dramatically, as if the engine has switched to
second gear. Also, the amount of smoke that comes from the exhaust will
decrease. Cleaning Out is a desirable characteristic once the engine is
fully broken in.
As the engine reaches normal operating temperature, it will speed up
and performance will increase. This occurs because the fuel mixture is
becoming leaner with the increased temperature. You will need to richen
the fuel mixture so that the engine continues to run as described above.
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