Di Pino Engines


Engines

1. Safety

Never consider your engine a "toy", but a true and proper internal combustion engine of the last generation, with a power that could injure yourself or others if not used with due caution. Responsibility for any damages caused by incorrect use will be due to the owner of the engine who must use the greatest professional care. If another person uses your engine in any way, you must ensure they have a copy of this manual. Never start or use the engine in a closed space. The fuel used for model engines is poisonous. Make sure it never comes into contact with the eyes or mouth. Always keep the fuel in a clearly marked container and out of the reach of children. This sort of fuel for model engines is also highly inflammable.Keep away from any open flame, excessive heat, sparks or anything else that could set it alight. Never smoke or allow others to smoke nearby.
These small engines generate high temperatures. Never touch any part of the engine until it has cooled down. Direct contact with the exhaust pipe, the head or the manifold in particular will cause severe burns.

2. Equipement

This is an engine for competitions, high-powered with 3.5 cc capacity.
It is supplied with a "C - Conical" glow plug, which improves considerably engine performance in terms of both power and regular functions, whilst reducing fuel consumption. Anyone wishing to use the “S – Standard” plug has to replace only the burn room, found in the spare parts list for this engine. The air reducers on the carburetor can be exchanged, thus adapting the engine functions to various types of tracks and different driving styles. The 7.5-8.5 mm reducer is part of standard supply, but spare parts include all sizes from 5 mm to 9 mm.


3. Installation.
Mount the engine securely on your model, following the manufacturer's instructions and using appropriate screwdrivers and wrenches. Install an efficient exhaust and make sure it remains so. Frequent and close exposure to a noisy exhaust (especially in the case of powerful high-speed engines) can damage your hearing and the noise can be bothersome to other people even at a distance.
Carefully check that the cables for lighting the glow plug and/or the battery cables for starting the model do not come into contact with any engine's rotating parts. Check also that the supply system connecting the carburettor and accelerator servo control have been assembled correctly. To switch off the engine, close the carburetor completely using the lever that controls the accelerator on the radio handset, then manually close the suction on the carburettor air filter, or press the fuel pipe. Never try to switch off the engine by slowing down the flywheel with your fingers or other metal tools. Immediately after switching off the engine, when the glow plug is still hot, the engine could restart WITHOUT the plug battery being connected, due only to the rotation of the engine parts. For their own safety, keep all spectators (adults and children) at a distance of at least five metres when you prepare to start your model car.

4. Start up

Before starting and running in the engine, it is necessary to install correctly and with great care the following accessories.

Glowplug: Insert carefully the supplied plug in the cavity of the engine head, making sure the threads match before tightening it firmly. (The plug is supplied already mounted on the engine, but we recommend this procedure every time you have to remove it. Conical plugs do not have gaskets).

Exhaust manifold: Mount the silicone gasket on the special grooves on the exhaust. Do not use metal tools that could cut the gasket, use only your fingers. Spread a light veil of oil on the gasket then insert the manifold, turning it gently into its position with the 4-hole flange. Insert the 4 springs provided in their special housings.

Exhaust pipe: Mount the silicone gasket on the special grooves on the exhaust pipe. Do not use metal tools that could cut the gasket, use only your fingers. Spread a light veil of oil on the gasket, then insert the exhaust pipe in the manifold, turning it gently. Mount the 3 springs provided in their appropriate housings. The exhaust pipe must then be fastened to the chassis using a flexible metal wire that will absorb vibrations and prevent any damage to the exhaust pipe.

 

Carburator

The engine is supplied with its carburetor installed but not firmly fastened in the standard position. Loosen the fastening screws and place the carburetor in the ideal position for your model car. Press the carburetor towards the engine while tightening the fastening screws. Tighten the screw as firmly as possible without fear of ruining the carburetor body.Now mount the air filter described previously. Make sure that the surfaces of the mounted engines are all on the same level and on the same plane. Incorrect installation can cause, at high temperatures, distortion of the casing, bearings, etc., resulting in a considerable loss of performance. We recommend use of the correct screws, according to the type of model, and to check that the fastening holes are perfectly centred.Check also that the engine casing does not touch the base of the model's chassis. Now you have completed the engine with all its parts and mounted it on your model, continue as follows.

5. Running in

To guarantee long life and top performance, each engine needs to be run in, bearing in mind that the more careful the running in is, and the longer is the period the engine gives its best performance.
Running in must be done carefully with the engine installed on the model, in the following way:

  • Fill up the tank with fuel.
  • Remove the plug temporarily to check that, when connected to the battery, the filament heats up and becomes incandescent (Orange/yellow). Put the plug back into place.
  • Switch on the transmitter and receiver and set the accelerator slightly open from the minimum position.
  • Start the starter motor on the starter box so the fuel flows from the tank to the carburetor. If the engine stops, do not force the starter box, but release the engine, using a screwdriver on the flywheel.
  • When you see through the transparent silicone pipe that the fuel is reaching the carburetor, connect the battery to the plug to heat the filament and start the engine. PLEASE NOTE: it is of extreme importance not to leave the engine in acceleration for a long period of time when the car model is not in contact with the ground (model resting on the starting box) because it would quickly overheat, causing serious damages.
  • When you switch on the engine, leave it running a few minutes with oily carburation, with the battery connected to the plug and with the wheels turning freely at a distance from the ground. Under these conditions, the oily carburation perfectly lubricates all the engine's internal parts. To know whether the carburation is sufficiently oily, abundant smoke should be issued by the exhaust pipe. Repeat the operation until all the fuel in the tank has been used up.
  • Disconnect the plug of the battery and try to run the car on track. If the carburation is too oily, slowly increase acceleration to keep the engine running as long as possible. If it stops because carburation is too oily, turn the full speed needle clockwise by 30° and try again.
  • If the engine continues to run even when carburation is very oily, continue to use the model until you have consumed at least 3 tanks of fuel. Then close the full speed needle by a further 30° and consume another 2 tanks of fuel. Repeat the procedure until you have consumed at least 6 tanks of fuel. However the exhaust pipe should continue issuing abundant smoke.
  • To switch off the engine, close the carburetor completely using the lever that controls acceleration on the remote control, then manually close suction on the carburettor air filter, or press the fuel pipe. Never try to switch off the engine by slowing down the flywheel with your fingers or metal tools.

Final tuning: Final tuning of the carburation must be done only after completing the running in, and according to the following procedure:

  • Run the model (with the carburetor completely open) on the longest possible straight track to observe the speed. Close the full speed needle by 30° and repeat the run, noting down the improvement in performance.
  • Continue with more runs, closing gradually the full speed needle, with the intention of reaching the straight run at the highest speed. Always remember that if the needle is closed too much (carburation too lean), the engine overheats, loses speed with a visible reduction of exhaust fumes. In this case, slow down immediately, stop the model and open the full speed needle by 45°.
  • With the engine running, and the wheels of the model raised above the ground, close the accelerator and leave it on minimum for at least 5 seconds, then fully reopen the accelerator. If at this point the engine discharges an excessive quantity of smoke and the model does not accelerate smoothly and rapidly, probably the minimum carburation is too oily. In this case, turn the base speed needle clockwise by 90°. Instead, if during the rapid acceleration phase the engine suddenly "coughs", the minimum carburation is too lean. You can correct this by opening the base speed needle by 90° anti-clockwise.

N.B.: the carburetor needles must be adjusted gradually and not more than 30°, always checking accurately the effect of any tiny adjustment on the accelerator.
Make the adjustment patiently, under contest conditions, until the engine responds rapidly and promptly to accelerator controls.

WARNING!
Adjustments of the carburetor by means of the minimum and maximum needles cannot be made accurately when the wheels of the model are raised from the ground since this does not reproduce the real conditions of use, and an operation of this kind could damage the engine by overheating.
When you reach the optimum carburation, a slight trail of smoke will be visible during high-speed runs and the engine rotation regime increases smoothly during acceleration. Remember that, if carburation is too lean, the engine will overheat and will not give maximum performance.
As for all engines, we recommend setting a slightly oilier carburation than the optimal point, as a safety measure. If the engine, with the carburetor completely closed, remains at a too high minimum regime, loosen the minimum screw in anti-clockwise direction to reduce the opening of the carburetor throttle.
Never ever exaggerate the number of revolutions because the engine can reach even 52,000 rpm, which would cause serious damage to the crankshaft and conrod.

6. Settings

A. Top speed needle: to adjust fuel input at maximum regime, when the carburetor throttle is completely open.
Turn clockwise (--) to reduce the quantity of fuel, for leaner carburation.
Turn anti-clockwise (+) to increase the quantity of fuel, for an oilier carburation.

B. Bottom speed needle: to adjust quantity of fuel in partial acceleration at medium regime, while opening the carburettor throttle.
Turn clockwise (--) to reduce the quantity of fuel, for leaner carburation.
Turn anti-clockwise (+) to increase the quantity of fuel, for an oilier carburation.

C. Idle adjusting screw: to adjust the engine's minimum regime when the carburetor throttle is completely closed. Turn clockwise (+) to increase the minimum regime. Turn anti-clockwise (--) to reduce the minimum regime. N.B.: although the carburetor settings are already indicatively calibrated by the manufacturer, they may need to be adjusted according to various uses of engine and type of fuel.

7. Maintenance

Remember that the performance and life of your engine depend directly on its care and maintenance, as described below.

Fuel filter: Tiny dirt particles, present in all fuels, can accumulate and partially obstruct the flow of the fuel, causing an incorrect and unreliable carburation, with the consequent reduction of performance.
A fuel filter must be installed on the suction pipe in your supply container to prevent entry of any foreign bodies in the fuel can. We also recommend installing a good filter between the tank and the carburetor.
Always remember to clean the filters regularly to remove any dirt that has accumulated inside.

Carburator: For the carburetor to function correctly, the small holes through which the fuel passes must be kept clean. At regular intervals, disassemble the carburetor and clean each needle and adjustment screw. Carefully check the O-rings on the various pins, making sure they are not damaged or broken. We recommend changing the O-rings regularly even if they are not broken. After cleaning, reassemble the carburetor placing the needles in the positions they occupied previously. Small errors are possible in positioning, so we recommend checking the carburation when the engine is restarted.

Fuel tank: After each competition, empty the fuel tank completely. Then charge the plug and restart the engine to burn up completely the fuel still present in the silicone pipe. This ensures that the remaining fuel does not deposit residue oil on the tank floor which would create problems when the engine is used later.

Engine: When the engine stops because it has used up all the fuel in the tank, remove the carburetor and inject a few drops of standard oil into the engine, and turn the engine using the electric starting box for the 4-5 seconds necessary to distribute the oil over all its internal parts. This procedure reduces the risk of internal corrosion until the engine is next started. To clean the exterior, we recommend use of methanol. Do not use solvents that could damage the silicone fuel pipe.

8. Warranty

This engine has been produced using high-tech materials and maximum precision machines. However, you have to consider that the severe conditions prevailing during competitions and the use of fuel containing increasing quantities of nitromethane constitute situations that cannot be controlled by the manufacturer.
We therefore regret that we cannot extend our normal warranty conditions to this engine.

Blended fuel: specifically for model racing cars, containing 10% - 30% nitromethane and 8% - 10% oil.
Initially we recommend use of a mix containing less nitromethane (20%), and more oil (10%).
Later, after running in, you can use more nitromethane (30%), and less oil (8%).
The ideal is then to use the same sort of fuel, but if you wish to change the brand or mix, we recommend repeating the running in phase as if the engine were new.
We want to remind you that the quality of the fuel influences greatly the engine's performance and useful life, so with blends containing a high percentage of nitromethane, it generates more power but reduces the life of the single components..

9. Tips

Choice of plug: The choice of the correct plug and the compatibility between plug and fuel can greatly influence engine performance, so you must choose the best type of plug only after a brief test. Install carefully the plug using the appropriate wrench; the plug must turn easily until completely inserted. Then, tighten closely so the plug is secure.

Plug life: In case of these high-performance model-racing engines, plugs have to be considered as consumable components.
The high technology used in production, and the top quality of the products used, ensure that our plugs have a longer life than others on the market.
However, the life of a plug can be lengthened and maximum engine performance guaranteed by a careful use, for example by:

  • Choosing the right plug.
  • Using good quality fuel.
  • Never leave the pipette attached to the plug when warming up the engine or when it is running.
  • Never use the engine with a too lean carburation, especially when the full speed needle is closed.

Replacing glowplug:: Naturally, apart from when the plug is burnt out, it may be necessary to replace it because it is not giving maximum performance, such as when:

  • The spiral filament is deformed
  • Dirt is stuck to the filament or the plug body is corroded
  • The surface of the filament has become rough and white
  • The engine tends to cut out when at minimum
  • Ignition becomes difficult

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