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Traxxas break in procedure

Discussion in 'Newbie Q & A' started by Patrick.a, Apr 11, 2013.

  1. Patrick.a

    Patrick.a New Member

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    Hello does anybody know the break in procedure for a traxxas 3.3 nitro engine
     
  2. MightySilent

    MightySilent Studio Forums Elite
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    BREAKING IN YOUR TRX 3.3 RACING ENGINE
    The TRX 3.3 Racing Engine uses a ringless, aluminum-brass-chrome
    (ABC) piston/sleeve construction. This type of engine design relies on
    a very precise running fit between the piston and sleeve for cylinder
    sealing. Engine break-in is necessary to allow the piston and sleeve
    to develop an extremely precise fit and optimum cylinder sealing.
    Therefore, proper engine break-in is critical to achieving the fastest,
    most reliable engine performance.
    Allow yourself about 1 to 1½ hours to complete the break-in procedure.
    The engine break-in period will take 5 tanks of fuel in a Jato. The break-in
    time is not the time to impress your friends with your new Jato. You must
    wait until the engine is fully broken in before attempting sustained
    high speed running. Patience and careful attention during break-in will
    reward you with the best-performing TRX 3.3 Racing Engine possible.
    During break-in, your engine may appear to malfunction with symptoms
    like stalling, inconsistent performance, and fouled glow plugs. These are
    simply the normal “break-in pains” engines sometimes go through. They
    will disappear once your engine is fully broken in. Many owners report
    not experiencing any of these symptoms with TRX Racing Engines. We
    recommend replacing the glow plug with a new one (included) after the
    engine break in procedure. Use the supplied glow plug wrench to remove
    the glow plug from the engine’s cylinder head (see page 15).
    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
    first 5 tanks of fuel. As the engine begins to break-in, the duration and
    intensity of the acceleration will gradually increase. Sustained highspeed
    running is not permitted until the 6th tank of fuel. Perform
    the initial break-in on a large, flat, paved surface. Jato is very fast and
    by tanks 4 and 5 you will need plenty of room for the truck to run in.
    Apply all throttle and braking actions gently. Abrupt acceleration or
    braking could cause the engine to stall unnecessarily.
    • Special break-in fuels are not recommended. Use the same fuel you
    plan to use everyday.
    • If possible, avoid breaking-in the engine on extremely hot or cold days
    (see page 25).
    • Pay careful attention to the fuel level. Do not allow the fuel tank to run
    completely empty. An extremely low fuel level causes the mixture to
    run too lean. This could result in a burned glow plug or extremely high
    engine temperatures.
    • Do not attempt to break in the TRX 3.3 Racing Engine by idling it on
    a stand. This will produce poor results.
    • Keep extra Traxxas glow plugs handy. The break-in process can cause
    deposits to form on the plug leading to plug failure.
    • Change or clean your air filter after break-in.
    • Follow the instructions exactly for each of the first 5 tanks of fuel.
    Starting Your TRX 3.3 Racing Engine for the First Time
    Before you start your TRX 3.3 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 temperature outside,
    remove all fuel and keep your Jato indoors until you’re ready to start it and
    then take it outside. If it’s colder than 45°F, special considerations should
    be made. See cold weather break-in on page 25. We do not recommend
    running the model in temperatures below 35°F.
    1. Turn on the radio system (see page 11).
    2. Make sure the throttle trigger on the
    transmitter is in the idle (neutral) position.
    3. Connect the EZ-Start controller according to
    the instructions on page 22.
    4. Press the starter button in short two-second
    bursts and watch for fuel moving through
    the fuel line up to the carburetor. Watch
    closely! The fuel moves very fast. If the fuel
    doesn’t move through the line within 5 seconds, prime the engine
    by briefly (one or two seconds) covering the exhaust outlet with your
    finger and pressing the EZ-Start button until the fuel is just visible in
    the carburetor fuel line. Watch carefully! If the engine is primed too
    long, it will flood with fuel and stop turning.
    5. Once fuel reaches the carburetor, the engine should
    quickly start and idle.
    6. Disconnect the EZ-Start controller from the model.
    7. Proceed with the engine break-in.
    8. Do not rev your engine with no load (wheels off the ground).
    If your engine doesn’t start, go online to Traxxas.com/support. If your
    factory fuel mixture settings have been altered, refer to page 21. If you
    still have problems, contact Traxxas Customer Support at 1-888-

    Tank 1
    1. Drive the model with the body off.
    2. Driving procedure: Gently pull the throttle trigger to 1/4 throttle
    over a 2-second count. Then gently apply the brake to stop.
    Count the two seconds out while accelerating: one thousand one,
    one thousand two, and then stop. Operate the throttle trigger as
    smoothly as you can. Repeat this starting and stopping procedure
    until the first tank of fuel is nearly empty.
    3. Look for thick blue smoke exiting the exhaust outlet. If there is
    no smoke, richen the high-speed needle 1/4 turn, by turning the
    needle counterclockwise.
    4. When the fuel tank is nearly empty, shut off the engine by pinching
    the fuel line connected to the carburetor (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, Jato should be driven with the body on.
    2. Driving procedure: Gently pull the throttle trigger to 1/2 throttle
    over a 2-second count. Then gently apply the brake to stop. Count
    the two seconds out while accelerating: one thousand one, one
    thousand two, and then stop. Repeat this starting and stopping
    procedure until the second tank of fuel is nearly empty.
    3. When the fuel tank is nearly empty, shut off the engine and let it cool
    for 15 minutes.
    Tank 3
    1. Driving procedure: Gently pull the throttle trigger to 1/2 throttle
    over a 3-second 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 third tank of fuel is
    nearly empty.
    2. As the engine loosens, the idle speed may increase and cause
    the model to try to creep forward when stopped. Reduce the
    idle speed by turning the idle adjustment (see page 15) on the
    carburetor counterclockwise.
    3. When the fuel tank is nearly empty, shut off the engine and refuel.
    From here on, you do not need to let the engine cool between tanks.
    Tank 4
    1. Driving procedure: Gently pull the throttle trigger to full throttle
    over a 3-second 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. Jato may try to shift into
    second gear. If it does, reduce the throttle input. Do not let Jato shift
    out of first gear.
    3. Keep your driving smooth and consistent.
    4. When the fuel tank is nearly empty, shut off the engine and refuel.
    Tank 5
    1. Driving procedure: Gently pull the throttle trigger to full throttle
    over a 3-second count, hold for 2 more seconds, and then
    gently apply the brake to stop. Count the five seconds out while
    accelerating. Repeat this starting and stopping procedure until the
    fifth tank of fuel is nearly empty.
    2. The model should now be shifting into second gear. If it is not, try
    turning the high-speed needle clockwise 1/8 turn to lean the fuel
    mixture slightly and test for shifting.
    3. When the fuel tank is nearly empty, shut off the engine and refuel.
    Tank 6
    STOP! Clean your air filter before you proceed. Refer to the instructions
    on page 19. During the sixth tank of fuel, the engine can be tuned for
    general performance use. Proceed to the next section in this manual.
     
    #2 MightySilent, Apr 11, 2013
    Last edited: Apr 11, 2013
  3. MaxximusRC

    MaxximusRC Studio Forums Elite
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