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Traxxas TRX 2.5R Скачать руководство пользователя страница 7

TRX 2.5R • 7

TERMS TO KNOW

Terms to Know

You’ll find these Nitro R/C engine terms
throughout this section of the manual.

.15 -

.15 or “15” refers to the size of the engine.

The TRX 2.5R is .15 cubic inches or 2.5 cubic
centimeters (cc). The name “TRX 2.5R” is
derived from the cc measurement.

ABC

- Abbreviation for aluminum, brass, and

chrome. Refers to engine construction that
consists of an aluminum piston that slides in
a chrome-plated brass sleeve. The TRX 2.5R
uses ABC construction.

Air filter

- The air filter sits atop the carburetor

and prevents harmful dust and dirt from
entering the engine. Dirt ingestion is the
number one cause of premature engine
failure so the engine should never be run
without the air filter in place.

Big Block .15

- A .15 (2.5) engine that uses a

larger crankcase size and longer stroke than
typical .15 engines. Generally only used for
specific racing classes.

Break-in

- Break-in is the procedure for running

a brand new engine according to specific
instructions. This correctly prepares the
engine for normal running. The break-in
procedure can be different for different
makes of engines. Follow the Traxxas
directions for break-in exactly.

Carb

- Abbreviation for carburetor.

Carburetor

- The carburetor atomizes (mixes)

the fuel with the air so that the engine can
burn it. There are two types of carburetors;
slide carbs and barrel carbs. The TRX 2.5R
uses the superior slide carburetor design.

Clean-out

- Cleaning-out is a condition that

occurs when the engine is accelerating and
the fuel mixture becomes sufficiently lean to
allow the engine to continue into its upper
RPM power band. It is usually characterized by
a noticeable decrease in blue exhaust smoke
and a dramatic increase in engine speed.

Combustion chamber

- The combustion

chamber is machined into the bottom of the
cylinder head. This is where the glow plug
ignites the fuel. The shape of the combustion
chamber is designed to promote more
efficient burning of the fuel.

Connecting rod

- The connecting rod

transfers the piston motion to the
crankshaft. The TRX 2.5R Racing Engine
uses a “knife-edged” connecting rod.
The aerodynamic, sharpened edges allow
it to “slice” through the pressurized air/fuel
mixture inside the crankcase.

Crankcase

- The engine “body” that contains all

of the running mechanical components.

Crankshaft

- The main shaft of the engine that

holds the reciprocating assembly.

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Содержание TRX 2.5R

Страница 1: ...OWNERS MANUAL ...

Страница 2: ...d trademarks of Traxxas Other brand names and marks are the property of their respective holders and are used only for purposes of identification No part of this manual may be reproduced or distributed in print or electronic media without the express written permission of Traxxas Note Some photos show the engine equipped with optional accessories such as the EZ Start system headers and engine moun...

Страница 3: ...any questions about your TRX 2 5R Racing Engine or its operation call the Traxxas Technical Support line toll free at 1 888 TRAXXAS 1 888 872 9927 Technical support is available Monday through Friday from 8 30am to 9 00pm Central time Technical assistance is also available at www Traxxas com You may also e mail customer support with your question at support Traxxas com Join thousands of Traxxas R ...

Страница 4: ...n a fuel dispensing bottle may look like a cool drink to a child Keep all fuel out of the reach of children at all times Do not place fuel containers on the ground where children can get to them while you are driving R C fuel is flammable Never allow smoking sparks heat or flame in the presence of fuel or fuel vapors The engine and exhaust system may become extremely hot during use Be careful not ...

Страница 5: ...w the new break in procedure as closely as possible to achieve the best performance and longest life from your TRX 2 5R Racing Engine Old style break in procedures such as simply running the engine with a very rich fuel mixture for the first 4 tanks of fuel will not achieve the best results Follow the steps in this manual to successfully break in the TRX 2 5R Racing Engine A routine maintenance sc...

Страница 6: ...ctor PowerTune Head Cylinder Head Pull Starter Low Speed Needle Throttle Arm Clutch Bell Flywheel Carburetor Air Intake Fuel Intake High Speed Needle Idle Speed Screw Crankshaft Crankcase Air Filter Housing TRX 2 5R Racing Engine Illustrated Optional Backplate ...

Страница 7: ...ferent makes of engines Follow the Traxxas directions for break in exactly Carb Abbreviation for carburetor Carburetor The carburetor atomizes mixes the fuel with the air so that the engine can burn it There are two types of carburetors slide carbs and barrel carbs The TRX 2 5R uses the superior slide carburetor design Clean out Cleaning out is a condition that occurs when the engine is accelerati...

Страница 8: ...n and sleeve If the fit is tight the piston will feel very tight at top of the sleeve and the engine will have good sealing and compression If the fit is loose compression will be low and both the piston and sleeve should be replaced Flame out Occurs when the engine stops running at high RPM Usually the fault of an excessively lean fuel mixture or glow plug failure Fuel 10 20 The TRX 2 5R must hav...

Страница 9: ...ves Low speed needle LSN Needle valve that controls the low speed fuel mixture Needle valve Valve consisting of a tapered needle that closes against a corresponding seat to regulate fuel flow Nitro Abbreviation for nitromethane a component of model engine fuel that improves fuel combustion and power output Nitro also refers to a class of R C powered by model engines instead of electric Nitro conte...

Страница 10: ...unburned fuel coming from the exhaust RPM Abbreviation for revolutions per minute how many times the engine crankshaft spins in a minute Sleeve Internal engine part that contains the piston The precise fit between the sleeve and the piston creates a seal that allows engine to have the required compression for combustion The sleeve in a TRX engine is made of brass and is then hard chrome plated Sli...

Страница 11: ... to match the metallurgy and temperature characteristics of Traxxas engines You may use 10 or 20 nitro content fuel Use the same percentage all the time don t switch back and forth between 10 and 20 fuel If you break in your engine on 20 fuel then always use 20 fuel What About Other Fuels Can other brands of fuel be used besides Top Fuel There are other fuels that can provide satisfactory performa...

Страница 12: ...rformance while protecting your engine from dust and dirt Use only the supplied filter You will not improve engine performance by switching to an aftermarket filter and you may risk engine damage due to poor filtration The TRX 2 5R air filter assembly consists of 3 pieces 1 A rubber filter base 2 A plastic housing consisting of a permanently assembled mesh cap and body 3 An oiled foam element You ...

Страница 13: ...ngines This type of filter oil is available at motorcycle pro shops Apply 30 drops of the Traxxas filter oil evenly to the top bottom and sides of the filter element 30 total drops divided among the 3 surfaces Squeeze the filter element repeatedly to help spread the oil throughout The filter element should be evenly colored by the oil Even color indicates that the oil is distributed evenly Do not ...

Страница 14: ...tio remains roughly constant Due to variations in atmospheric conditions temperature humidity altitude etc fuel flow adjustment valves called fuel mixture needles are required to meter the fuel and maintain the ideal air fuel ratio in these ever changing conditions For example colder air is more dense more air molecules for a given volume of air and therefore requires more fuel more fuel molecules...

Страница 15: ...elerate from idle the throttle opens and the low speed needle is pulled away from the needle seat This allows more fuel to flow with the increased air flow As the throttle is increased the low speed needle is pulled completely away from the needle seat leaving it fully open At that point fuel metering is entirely controlled by the high speed needle Again using our water hose example when the spray...

Страница 16: ... Do not readjust your carburetor from the factory settings until after the engine is started and running and you have been able to observe the engine running to assess what minor adjustments may be required to compensate for fuel temperature and altitude Adjustments are usually made in 1 8 or 1 16 turn increments The Idle Speed Adjustment The idle speed screw controls the closed position of the th...

Страница 17: ... disappear once your engine is fully broken in Many owners report not experiencing any of these symptoms with the TRX 2 5R Racing Engine We recommend replacing the glow plug with a new one after the engine break in procedure Engine Break in Procedure The focus during break in is to vary and limit the engine speed This will be accomplished by accelerating and stopping at different rates for the fir...

Страница 18: ... start your TRX 2 5R Racing Engine for the first time make sure you have read all instructions and precautions in this manual Pay close attention to the tank by tank break in instructions in the next section and make sure you have read and understood them before you run your engine Your engine must be at room temperature 70 F or 21 C or above the first time you start it If it s cooler than room te...

Страница 19: ...retor use the installed clamp 5 Let the engine cool for 15 minutes Note If at any point the engine cuts out or stalls during gentle acceleration richen the high speed needle 1 4 turn by turning the needle counterclockwise Tank 2 1 From tank 2 forward model should be driven with the body on 2 Driving procedure Gently pull the throttle trigger to about 1 2 throttle over a 2 second count Then gently ...

Страница 20: ... count Then gently apply the brake to stop Count the three seconds out while accelerating one thousand one one thousand two one thousand three and then stop Repeat this starting and stopping procedure until the fourth tank of fuel is nearly empty 2 Apply the throttle gradually Your finger should not reach full throttle until the end of the three second count 3 Keep your driving smooth and consiste...

Страница 21: ...warmer running conditions Warm the engine to approximately room temperature by removing all fuel and storing the vehicle inside at room temperature until just before starting the engine An extremely cold engine can become difficult to start After the engine is running it is important to keep the temperature of the engine to at least 200 to 215 degrees during break in In weather below 45 degrees th...

Страница 22: ...r engine below 35 degrees Fahrenheit If you insist on running your vehicle below 35 degrees be aware that nitro engines may be very difficult to start and tune at those extremely cold temperatures Also at temperatures below freezing nitro fuel can actually begin to gel up and this can be harmful to the engine Follow the remaining break in procedures as outlined in this owner s manual This along wi...

Страница 23: ... fuel mixture increases performance High Speed Fuel Mixture Adjustment With the engine warm and running at a rich setting gradually lean the high speed fuel mixture in 1 16 turn increments Make several high speed passes after each adjustment to clear out the engine and note any change in performance The TRX 2 5R is extremely powerful Remember to apply the throttle gradually to prevent wheelies or ...

Страница 24: ...ly the engine s throttle response should be very quick Idle Speed Adjustment Once the high and low speed mixtures have been set reduce the idle speed to the minimum reliable idle speed Remember this adjustment should be made while the engine is running at normal operating temperature 1 Turn the throttle trim on the transmitter so that the brakes are applied This ensures that the throttle slide is ...

Страница 25: ... You may need to adjust your carburetor needles to compensate for changes in temperature and barometric pressure air density from day to day Generally you ll need to richen the fuel mixture when the weather is colder than your baseline temperature and the air density is higher Lean the fuel mixture when weather is warmer than your baseline temperature and the air density is lower The chart below p...

Страница 26: ...eventy degree weather For this reason we cannot give you a definitive temperature range that indicates the best possible engine tuning The temperature gauge can aid you in tuning by giving you a relative indication of how your adjustments are affecting the engine and by preventing you from exceeding maximum engine temperature For example as you lean the fuel mixture the engine performance will inc...

Страница 27: ...Remove the fuel line where it connects to the carburetor to see if there is fuel in it If not you may need to prime the engine Reconnect the fuel line and then refer to page 18 for instructions on priming the engine Check your fuel mixture settings It may be necessary to adjust the fuel mixture if the outside temperature or barometric pressure has changed significantly since the last time the engi...

Страница 28: ...an t always be accounted for with a single high speed needle setting The symptoms described above can occur when the air density is very low such as in high mountainous elevations and extremely cold temperatures Under these conditions lean the fuel mixture slightly 1 8 turn and see if there is any improvement in starting and idling Lean the fuel mixture only until the engine will run and idle reli...

Страница 29: ...e the glow plug and gasket with the glow plug wrench supplied with your model A 5 16 8mm nut driver will also work 2 Turn the model upside down 3 Pull the starter handle several times to clear the engine of excess fuel 4 Turn the model over and reinstall the glow plug and gasket 5 Do not prime the engine Apply 1 2 throttle and pull the starter The engine should start immediately Piston Stuck at To...

Страница 30: ...osits This is extremely important for the life of the engine See page 31 for after run maintenance procedures Inspect the vehicle for obvious damage or wear Look for 1 Loose or missing screws 2 Cracked bent or damaged parts 3 Cut or loose wiring 4 Cut or kinked fuel lines 5 Signs of fuel leakage Inspect the gears for wear broken teeth or debris lodged between the teeth After run Procedure You must...

Страница 31: ...ops clean the outside of the engine with compressed air or spray motor cleaner Once the engine is clean and dry remove the glow plug power wire glow plug and air filter 5 Open the throttle fully and spray a one second burst of WD 40 into the carburetor and into the glow plug hole Caution Wear safety glasses to prevent spray from getting into your eyes 6 Place a rag or paper towel over the engine t...

Страница 32: ...o idle Replace the wrist pin and G clip whenever the piston and sleeve are replaced Follow the instructions for the proper break in procedure of a new TRX 2 5R Racing Engine whenever the piston and sleeve are replaced Connecting rod The connecting rod should be replaced when the piston and sleeve are replaced or after three gallons of fuel whichever comes first Also replace the piston wrist pin an...

Страница 33: ... slide the 5x8x0 5TW with the clutch bell off of the crankshaft Nitro 4 Tec owners will need to slide two 5x8x0 5TW off the pilot shaft Caution It s important to use eye protection when removing the E clip from the shaft to prevent the clip from causing an injury Pull the clutch shoes off of the flywheel pins Remove the flywheel nut from the crankshaft using an 8mm socket 202 and disconnect the fl...

Страница 34: ...slide up and out of the crankcase 402 Note If the sleeve does not slide out of the crankcase with reasonable effort slightly warm the crankcase with a hair dryer or heat gun to about 130 F The sleeve should slide out easily at this temperature Use gloves to protect against burns Rotate the crank to where the rod and piston are located at TDC top dead center top of the piston s stroke 403 Gently pu...

Страница 35: ...he crank pin then the crank pin is worn and the crankshaft will need to be replaced Important Do not reuse a damaged or worn crankshaft This will dramatically shorten the life of your rebuilt engine If there are damaged or worn parts beyond the piston sleeve and connecting rod it may be best to take advantage of the Traxxas Engine Replacement Program 8 Slide the crankshaft back through the crank b...

Страница 36: ... cooling head Slowly tighten each screw just a little at a time in a crossing pattern see picture 1003 until each bolt becomes snug Finish each bolt in the same pattern with 9 11in lbs of torque 9 Apply a drop of after run oil in the piston s wrist pin bore before installing the wrist pin Locate the oil hole refer to pic 901 in the connecting rod and the skirt relief side of the new piston Insert ...

Страница 37: ... case 1201 Slide the flywheel over the pilot shaft and onto the split cone washer The split cone washer should fit inside of the tapered hole in the flywheel Thread the flywheel nut all the way up to the flywheel and tighten the flywheel with 55 65 in lbs of torque against the flywheel 1202 13 Slide the clutch shoes onto the flywheel Key the flywheel pins into the holes of the clutch shoes See pic...

Страница 38: ...art onto the starter shaft that exits the backplate of the engine Line up the drive with the roller clutch Fasten the EZ Start gear case to the backplate with the three 3x12BCS screws 1502 Fasten the pull starter with 4 3x12BCS 16 Inspect the exhaust O ring and replace it if it is damaged or torn Fasten the exhaust header and pipe assembly back onto the rear of the engine case with the two 3x15CS ...

Страница 39: ...Start 8 Fit 8 Flame out 8 Flywheel 6 Fuel 4 8 11 handling 12 intake 6 nitro content 11 other fuels 11 TraxxasTop Fuel 11 tubing 8 Fuel Mixture 8 15 atomization 14 high speed mixture see High Speed Adjustment lean 9 15 16 leaning 9 low speed mixture see Low Speed Adjustment ratio 14 rich 10 15 16 Glow plug 8 driver 9 Header 9 High Speed Adjustment 22 high speed needle 6 9 Idle Speed 9 16 23 idle sp...

Страница 40: ...1 1 00 Klein Road Plano Texas 75074 1 888 TRAXXAS 051007 ...

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