Ripmax RMX User manual

INSTRUCTION MANUAL
For your safety please read the following instruction
manual carefully before running your engine
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Published and distributed by: Ripmax Ltd,
Ripmax Corner, Green Street, Enfield EN3 7S
Tel: [phone]
RMX instructions A5-ish size 8/10/03 3:16 PM Page 1

RMX INSTRUCTION MANUAL
Please read the following instruction manual carefully before running your engine
Thank you for purchasing your RMX engine. The following information and recommendations are presented to help you in the
operation and maintenance of your RMX engine. It is extremely important that you read and thoroughly understand the assembly
and break-in procedures. The few minutes devoted to familiarising yourself with these instructions will save you hours of frustration
when the time comes to operate the engine. Also, please ensure you read the enclosed safety guidelines and warranty information.
We hope you enjoy the many features and benefits of your RMX engine including its high performance and trouble free operation.
IMPORTANT – SAFETY INSTRUCTIONS AND WARNINGS
READ THESE INSTRU TIONS END TO END BEFORE OPERATION
The RMX engine you have purchased is a highly efficient internal combustion engine that is capable of producing tremendous power,
which if not used in a responsible manner could seriously injure you or other people. Always ensure your engine is properly
maintained and treated with the utmost respect during operation.
If you are in any doubt with regard to any point in these instructions or with the operation of your engine contact Ripmax
Ltd or your local distributor.
WARNINGS
• ALWAYS ensure the engine is securely mounted on a stand or model.
• NEVER touch or allow any object to touch or come into contact with the rotating engine parts or propeller.
• ALWAYS check the propeller nut is secure.
• ALWAYS check your propeller for nicks or damage. A disintegrating propeller could cause serious injury and damage.
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• MODEL FUEL IS POISONOUS - Do not swallow or allow it to come into contact with the eyes.
• MODEL FUEL IS HIGHLY FLAMMABLE - Store in cool area. DO NOT allow it to come into contact with a naked flame.
• NEVER operate your engine in an enclosed space. Model engines produce carbon monoxide which is highly dangerous.
• DO NOT touch any part of the engine until it has cooled. Model engines generate tremendous heat. Contact with the silencer,
cylinder head or any other part of the engine may result in a serious burn.
IMPORTANT NOTI E:
Ripmax Ltd and its distributors do not accept any responsibility for injury, damage or loss that may arise from the use or misuse of
this engine or any part of it. Neither do they accept any responsibility for damage or injury arising as a consequence of non observance
of the instructions and procedures laid out in these instructions or any supplementary instructions supplied. The owner or user of the
engine is totally responsible for its safe operation and maintenance.
1. INSTALLATI N
To Install your new engine, please follow these simple steps using the Key Numbers (*) on the exploded diagram to identify the parts:
Inside the RMX box, you will find the various components of your RMX engine. These will vary depending on the engine specification.
1 x Engine wi h carbure or
1 x Silencer / Muffler (Parts Diagram No.2) (depending on engine specification – some engines are NOT supplied with silencers)
1 x Tool se (contents will vary depending on engine purchased)
1 x Remo e Needle Valve Uni (only supplied with certain engines – also available as an option)
Additional basic items required for operation but NOT supplied are: Propeller, Glowplug, Glowstart or 2v Battery and Glowplug Clip,
Chicken Finger or Electric Starter and Fuel. Other items such as a silencer may be required depending on the type of engine.
Please consult your retailer or contact Ripmax Ltd if in any doubt.
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1.1
CARBURETT R WITH INTEGRATED
NEEDLE VALVE.
Undo the carburettor pinch-bolt retainer
(3) using the Allen wrench (supplied) and
carefully rotate the carburettor until it is
at right angles to the engine.
1.3
Once the carburettor is seated and
aligned correctly, keeping pressure on it,
tighten the pinch-bolt securely. Do not
over tighten.
1.2
Next push down firmly on the carburettor
to seat it and compress the O-ring. Any
gap will allow air to leak in and affect
engine operation.
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2.
REM TE NEEDLE VALVE (RNV).
Some engines come with a remote needle
valve unit (4). This is also an optional part.
The RNV allows the adjustment of the high
speed (main) needle at the back of the
engine or in a remote, easily accessible,
location on the fuselage. When the RNV is
fitted to the fuselage ensure the mounting
is secure and transmits the minimum of
vibration to the RNV.
2.2.
Remove the two upper bolts from the
back plate and attach the completed RNV
to the engine using the back plate bolts.
The aluminium valve body should be on
the left of the engine (see photo).
Connect the silicone tubing supplied
between the carburettor fuel nipple and
the RNV supply nipple. The aluminium
RNV body can be rotated to the position
required (see above). Once in position
tighten the retaining bolt firmly.
2.1
FITTING.
Carry out steps 1.1~1.3 as per the
standard carburettor. Next, carefully
remove the Needle Valve Assembly (NVA)
(5) from the carburettor using an 8mm
wrench (not supplied).
Take the carburettor plug bolt (6), fit the
washer and screw the bolt into the hole
in the carburettor left by the NVA.
Tighten firmly. Take the NVA and,
checking the washer is in place, install it
into the RNV body. Tighten firmly.
NVA
NVA
CARBURETT R
PLUG
CARBURETT R
PLUG RNV at
90°
UPPER
B LTS
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3. ENGINE INSTALLATI N
The safe installation of any engine is critical for both operation and safety. Whether in a model or on a stand only use hardened steel
bolts and locking nuts to attach the engine. These will protect against potential metal fatigue and the possibility of the engine coming
loose due to vibration during operation. Regularly check for tightness – a loose engine is extremely dangerous.
4. FUEL TANK L CATI N
The location of the fuel tank can affect the operation of your engine. We suggest that you position it as close to the engine as possible
– whether you are running the engine in a test stand or fitted in your model. The centreline of the fuel tank should be slightly lower
than the fuel spray nozzle located in the center of the carburettor. Always check all fuel line connections for leaks, prior to use, to
ensure consistent engine operation.
5. SILENCER INSTALLATI N
Locate the silencer mounting bolts (7) from the tool set and attach the silencer
(2), as shown in the exploded parts diagram, using the Allen wrench. Tighten the
mounting bolts securely. When tightened the machined faces should seal
perfectly. However, to ensure a perfect seal or if a leak does occur, place a
doubled piece of PTFE pipe sealing tape (available from any DIY store and some
model shops) over the exhaust port and refit the silencer.
There is no need to cut out a hole for the exhaust as the gases escaping from the
engine will blow a hole through the tape the first time the engine is run. After
the initial engine run check the bolts for tightness. If, due to vibration, the
silencer bolts come loose, a small amount of threadlock can be used to secure
them. Use Threadlock NOT Studlock (Grip Thread-Lock Item No. S-RA20). Your
RMX engine is now ready to be run.
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6. GL W PLUG SELECTI N
Your RMX engine is supplied without a glow plug. For best results, choose a long reach plug that has a medium heat range, such as
an Enya No.3 (Item No: L-EP03) or FirePower No.5 (Item No: L-FP05). These plugs are designed for general use (both ABC & Ringed
engines) and should provide you with a quick start, reliable idle and a smooth pick up. To install the plug, fit the washer provided
(this is important otherwise damage could be done to the piston) and screw into the head of the engine. Tighten firmly. DO NOT
over-tighten otherwise you may strip the thread in the head.
Note: NEVER use a cheap, low quality glow plug on any engine as this will not give a reliable idle and smooth operation – this is a
false economy. Always ensure before starting that the glowplug power supply has sufficient power to light the plug otherwise
starting will become very difficult.
7. FUEL
IMPORTANT – Model engine fuel is poisonous and flammable. DO NOT allow it to come into contact with the mouth or eyes. Store
in a clearly marked container with a childproof safety top. Store out of the reach of children. Keep away from naked flames, excessive
heat or anyone smoking.
Always use clean, fresh, high quality fuel. Because dirt is the number one enemy of any engine, we highly recommend the use of a
fuel filter between your fuel pump and the tank filler line. Also install one between the tank and the carburettor (Item No: L-IP176).
A fuel containing 5%~15% nitromethane and 20% castor oil or castor/synthetic oil, is the ideal choice for all RMX engines. If castor
oil or castor/synthetic blend fuels are unavailable you may use a fuel that only contains a synthetic oil for its lubricant. We suggest
however, that you always run the engine at a slightly richer setting to prevent overheating damage caused by running too lean.
Note: DO NOT use cheap ‘non branded’ type fuels in any engine – this is a false economy. These will not give a reliable idle, smooth operation
and good performance. Cheap fuel can also increase the possibility of internal corrosion damage in the engine (see section 16).
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8. PR PELLER SELECTI N
Using the correct size propeller to suit your particular application is very important. Please use the selection chart below to match
your engine to the correct size prop. When breaking-in the engine (see section 11), please use a recommended prop size as listed on
the chart. To select a prop to fit a particular application, start with the break-in prop, then experiment with other prop sizes when
the engine is fitted to the model, to find the one that produces the optimum results, without overloading the engine.
SPINNERS: If you are using a spinner, make sure the cut-outs for the blades are deep enough to prevent any contact between the
spinner and the prop blades. This will prevent any possibility of the spinner cutting into the propeller blade and weakening it.
9. PR PELLER INSTALLATI N
Remove the prop nut and washer (8) and place the propeller on the engine. Next replace the washer and prop nut and tighten just
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Engine Propeller Size
.38 9x6.5
10x5 - Break-in
10x6
.40 9x6.5
10x5
10x6 - Break-in
.48 10x6
10x7 - Break-in
11x7
REC MMENDED PR PELLER SIZES
Helicopter engines can be broken in on the bench using the same propeller sizing as the equivalent Aero
version or installed in the helicopter. IMP RTANT: Breaking-in a heli engine in a helicopter must be done
with the main rotor blades attached. Ask your dealer or a local heli club/flyer for assistance. If in any
doubt ring Ripmax Technical Department for assistance.
IMP RTANT: Prior to installation, it is extremely important to make sure the propeller is balanced.
Unbalanced props are not only dangerous to operate, but can lead to premature failure of both the
engine and prop. Prop balancers can be purchased from any model shop and are a worthwhile
investment. Always secure the propeller tightly, but do not crush the wood or composite material of the
prop. Remember to inspect the prop thoroughly before use for any nicks or signs of fatigue which may
lead to prop failure at a critical time. The results could be very dangerous for you or any by-standers.
Whenever possible, we recommend that you use high quality Glass Filled Nylon or Wooden propellers as
they are less likely to break under the strain of high RPM.
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over finger tight. Rotate the propeller anti-clockwise until resistance to the turning motion
is felt. Now loosen the prop nut and rotate the propeller anti-clockwise, without the
crankshaft turning, to a 2.40 o’clock position, as if the propeller were the hands on a clock
face. Re-tighten the prop nut securely. When the propeller is turned over ‘anti-clockwise’
– the correct rotation for starting the engine – the pressure from the cylinder compression
should be felt at the 2 o’clock position.
10. THR TTLE LINKAGE
Connect the throttle linkage to the throttle arm (9). Make sure the movement is friction
free. Check that the carburettor throttle arm travel, fully open to fully closed, matches the
transmitter stick movement. The carburettor should be fully closed with the stick trim in
the fully down position, so the engine can be cut dead. The trim is moved upward for
starting and operation. Some mechanical adjustment may be needed with non-computer
transmitters to set the idle. On computer transmitters the ATV/EPA can be adjusted to set
the idle position.
11. BREAK-IN PR CEDURES
Prior to running your new RMX ringed or ABC engine for the first time, it is important you understand the break-in procedure for
your type of engine. The purpose of ‘break-in’ is to achieve the proper seating between the cylinder sleeve and the piston or
piston/ring. Most modellers prefer to break-in their engines with the engine installed in the model. Alternatively you can mount your
engine securely in a test stand. This allows you safe and easy access to all parts of the engine during the break-in period. Good
ventilation is critical. ABC or Ringed – If you’re not sure if your engine is ‘ringed’ or ‘ABC’ look through the exhaust port and rotate
the crankshaft until you can see the top of the piston. If it is ringed you will see one or two dark metal rings about 3mm from the
top. If it is ABC the pistion will be one piece and all the same colour.
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9.1 PR PELLER INSTALLATI N
➜
➜
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N TE: When turning over an ABC engine it will be very tight at the Top Dead Centre (TDC). It may even click/squeak as it goes over
centre. This is normal. The tightness creates a good seal between the piston and liner and is necessary for correct operation.
11.1 RINGED ENGINE BREAK-IN
Excessive heat build up during the first few runs can damage the ring and cylinder. A very rich needle setting, more fuel than air in
the mixture, is required to keep the engine cool while the ring seats. While running rich, the engine will create quite a bit of smoke
and the exhaust will be very oily. After 2~3 tank fulls at a rich setting the high speed needle can be leaned out a few clicks at a time
for best performance, remembering that too lean a setting at any time will damage the ring and cylinder.
11.2 ABC ENGINE BREAK-IN
The break-in of an ABC engine requires the same basic procedures as a ringed engine, except for a couple of minor differences. The
first few runs should be at a slightly rich setting, but not as rich as a ringed engine, close to normal operating temperatures. Heat
helps the piston seat in the liner. Also the time involved is shorter. ABC break-in procedure is fully detailed in Section 12.
STARTING PROCEDURE
12. STARTING, RUNNING AND BREAKING-IN AN ABC ENGINE
To start the engine, you will need the following items:
• Fuel – good quality, preferably with 5% nitromethane and 20% castor or synthetic oil (ask your model shop for assistance).
• A 1.2~1.5 volt glow plug battery with connector or a glowstart. Check to make sure power source is fully charged.
• A chicken stick or electric engine starter.
12.1 Install the plug of your choice (with its washer). Fill the fuel tank with the recommended fuel via the carburettor fuel line.
12.2 Connect the fuel line from the tank to the carburettor inlet nipple. Do not connect the pressure line (see section 14) to the
silencer pressure nipple at this time.
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