721 Scuderia Gen 2 Pro Nitro Engine - Manual

ENGINES OPERATION AND CARE MANUAL
1. INTRODUCTION
Congratulations for the purchase of this engine. This engine has been
projected, developed and tested in cooperation with the best drivers in the
world. The most advanced technologies and materials have been used to
achieve the best performance and reliability. In order to get the best
performance and reliability, read this manual carefully before using the
engine. Always follow the safety precautions.
2. IMPORTANT NOTICE
Always remember:
 This engine is not a toy but a high-performance engine; misuse can
result in injury to you or others.
 This engine has been developed for use on a RC model car exclusively.
 During and right after engine operation, keep children out of reach of
the model car and engine.
3. SAFETY PRECAUTIONS
As owner and user you are responsible for the safe and proper use of the
engine. We encourage utmost care and prudence when you use the engine.
Always be aware of the following dangers.
Failure to comply with one of following points can lead to serious injuries to
the user or to others!
Poisoning warning! The fuel used to power the engine is toxic. Store it in
a safe location out of the reach of children. In the event of ingestion or
contact with the eyes, immediately wash with water and refer to a doctor.
Poisoning warning! Don’t operate the engine in closed spaces. As with
full size cars, exhaust gases are toxic and asphyxiating (combustion
residues, carbon monoxide). Operate the engine in open spaces only.
Burn warning! When running, the engine produces considerable heat, in
particular near the cooling head and the exhaust. Don’t touch the engine or
any of its parts until it has completely cooled down.
Injury warning! While assembling, adjusting and servicing the engine,
use proper tools and screw-drivers.
Fire warning! Fuel is highly flammable; do not smoke while handling it.
Keep the fuel away from heat sources or open flames.
High noise levels caution! Install a proper exhaust system; exposition to
high noise levels can damage hearing.
4. OPERATING PRECAUTIONS
Failure to comply with one of following points can lead to serious damage
to the engine. Warranty doesn’t extend to these cases.
 Assemble the engine following instructions and suggestions; use proper
tools.
 Before starting the engine, always check for correct tightening of
screws and nuts (in particular those related to joints and removable
parts, such as the carburetor 8 retainer); loose or missing screws are a
frequent reason of engine damage or erratic function.
 Avoid contact between battery or radio wires and rotating parts.
 To stop the engine, close the throttle and stop the fuel flow by
squeezing the fuel pipe while the engine is idling.
 When starting the engine, avoid flooding the engine with too much
fuel, as it can damage the engine with hydraulic locking. If the engine
is flooded, remove the glow plug, interrupt the fuel flow and spin the
engine by hand to eliminate the excess fuel. Cover the engine head
with a cloth to avoid fuel from spraying out into your eyes.
When the piston is near to top dead center (TDC) and in cold conditions, it
can be difficult to spin the engine. This is normal; the liner has a slightly
conical shape which attains perfect geometry when the engine is running at
optimal temperature.
5. GENERAL INFORMATION
Fuel
Only use fuel specifically formulated for RC car engines. This type of fuel is
generally available in model shops and contains a nitromethane percentage
ranging from 10% to 25%. During engine break-in, use fuel with 16%
nitromethane content. Once the breakin procedure is completed (and only
if needed) you can use fuel with higher nitromethane content. Be aware
that high nitromethane content improves engine performance but also
affects the glow plug and engine longevity.
Warning! Typical model car fuels are toxic; avoid ingestion and contact with
the eyes.
Air filter
Use and proper care of the air filter are essential for engine longevity and
performance. Soak the air filter with a good quality oil, such as the one
usually supplied with the filter. Without the air filter, dust and dirt can
enter the engine, possibly damaging the engine.
Always use an air filter when running the engine.
Carburetor
The carburetor supplied with the engine is pre-set for the break-in
procedure. After the break-in procedure is completed, it must be adjusted
for normal use conditions. Carburetors have 3 adjustments available:
 High speed needle, top screw: adjusts the fuel flow when the throttle is
fully opened. Turning this needle clockwise, you will lean out the
mixture; turning counter clockwise you make the mixture richer.
 Low speed needle, screw at the end of carburetor slide: tunes
acceleration from idle, regularizes the idling. Turning this needle
clockwise, you lean out the low speed mixture. Turning counter
clockwise you make the mixture richer.
 Idle screw, the small screw on the side at an angle: Stops the
carburetor slide from closing completely, sets the engine idling. Turning
this needle clockwise increases the idle RPM; turning it counter
clockwise decreases the idle RPM. This screw and the low speed needle
are to be used together to adjust the engine idling.
Always check that the fuel supply circuit is perfectly sealed. Always tune
the engine with small adjustments; engines are highly sensitive to
carburetion settings.
Glow plug
Engines are sensitive to the glow plug type and weather conditions. We
suggest you to always use REDS glow plugs to achieve the best
performance and a stable running. Install the glow plug carefully. Use a
proper tool when you change the glow plug, make sure the glow plug is
correctly inserted into the thread before tightening it. Check the glow plug
and filament regularly; unexpected engine stalling or irregular running can
be caused by the oxidation or wear of the filament. The spiral shaped
filament must have a bright silver color (and glow brilliant orange when
connected to glow starter).
A broken, impacted or missing filament is a serious condition which
requires thorough inspection of the engine. The loss of the spiral filament
can be caused by the mixture being too lean or the engine running too hot.
Top end needle is screwed too far in. The engine needs more fuel. If not
corrected, a damaged glow plug or filament issue will lead to permanent
damage to the engine.
There are two kinds of glow plugs – standard and turbo; the choice
depends on the engine type and application.
Exhaust system
The exhaust system has two functions: it helps to reach the best
performance and reduces the noise levels produced by the engine. We
suggest that you only use original REDS exhaust systems. While
assembling, be careful to align all the parts correctly. Any mechanical
stress on the exhaust system connections will cause a leak. Exhaust leaks
will cause inconsistent performance and will make the engine difficult to
tune.
Regularly check all the parts and substitute them if they are damaged or
worn.
6. OPERATING INSTRUCTIONS
Engine installation
Before installing the engine on the model car, check that the engine mount
is flat. Flatness avoids distortions and deformations. It also allows the best
heat dissipation through the chassis. Mount the engine so that the spur
gear and the pinion are aligned and that the gear mesh is adequate;
connect the fuel line and the pressure line. Tighten the motor mount
screw; tighten the carburetor retainer once it is aligned with the linkage.
Check the throttle linkage and verify that the carburetor if fully opening
and closing and that the movement is free of any mechanical binding.
The piston in a cold engine will be hard to move and will almost get stuck
near the top dead center: this is normal. The fit between the piston and
liner has been designed to ensure optimal performance when higher
temperatures are reached during normal running. Once the engine is
warm, the piston will move much more freely.
Starting the engine
Running the engine without an air filter can seriously damage the engine.
Fill the tank with adequate fuel. Connect the tank to the carburetor. When
starting the engine for the first time, plug the exhaust tip with a rag and
rotate the crankshaft by hand a few times without using the glow plug
igniter. This will draw fuel into the engine and lubricate it before starting it.
Then, with the carburetor in the idle position, connect the glow plug igniter,
wait for about 2 seconds and start the engine. If the engine does not start
or briefly starts and then stalls, connect the glow plug igniter for 10
seconds and then try again. This way the glow plug will burn the excess
fuel and heat up the filament to start the combustion.
It’s possible during engine startup to have an hydraulic lock of the engine,
due to flooding. Flooding happens when the cylinder fills up with too much
fuel. If the engine is flooded, remove the glow plug, stop the flow of fuel to