THE TRX 3.3 RACING ENGINE

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THE TRX 3.3 RACING ENGINE9Filling the Fuel TankUse a fuel dispensing bottle (Traxxas Top Fueler, included)to put fuel into Revo’s fuel tank. To fill the fuel bottle,squeeze the air out, insert the dispenser tip into thefuel can, and release your grip on thebottle. As the bottle expands, fuel willbe drawn into it.To fill your model, pull up on the fuelcap handle, insert the tip of the fuelbottle, and squeeze to dispense the fuel.THE AIR FILTERThe TRX 3.3 Racing Engine in this modelis equipped with a specially designedtwo-stage air filter to deliver maximum filtering efficiency andperformance while protecting your engine from dust and dirt duringextended operating conditions. Use only the supplied filter. You willnot improve engine performance by switching to an aftermarketfilter, and you may risk engine damage due to poor filtration.The two-stage TRX Racing Filter consists of the following components:1. A rubber filter Base2. A 3-piece plastic housing3. A “pre-filter” element4. A “primary” filter elementYou must clean the outer pre-filter after every hour of run time,even if the filter looks clean. The primary filter element inside mustbe cleaned after 3-4 hours of run time. These intervals includethe break-in time. Clean your air filter after break-in. Dust (whichis often too fine to see) and dirt constantly move through the filteranytime the engine is running. Even if you can’t see dirt on the filter,it is present inside the foam after any amount of run time. If youexceed the recommended cleaning intervals, your engine will bedamaged. Engine damage or wear due to dirt ingestion is easy todetect, and one of the top causes of premature engine failure.Pre-Filter Cleaning Instructions (every hour of run time)1. Remove the clip from the air filter and remove from the metalhanger. Remove the air filter assembly from the carburetor boreby pulling the entire filter assembly firmly to the side to release it.Do not pull straight up.2. Remove the pre-filter element.3. Clean the pre-filter element by Pull to the side to remove assemblythoroughly washing the foamelement in hot soapy water(dishwashing detergent workswell). Repeat twice.4. Thoroughly dry the pre-filterelement with a clean towel.5. Oil the foam element with air filteroil. Use Traxxas filter oil (part#5263) or a high-quality, special-purpose foam filter oil like what isused for off-road motorcycle and ATV engines. This type of filter oilis available at motorcycle pro-shops. Apply a total of 24 drops ofTraxxas air filter oil, evenly distributed between the top, bottom andsides of the filter element. Squeeze the filter element repeatedly tohelp spread the oil throughout. The filter element should be evenlycolored by the oil. Even color indicates that the oil is spread evenly.Do not squeeze out excess oil. Note: Do not use the air filter oil foranything other than the air filter. It is not meant to be a lubricant.6. Reassemble the filter and install it on the engine. Make sure therubber filter neck fits securely on the carb with no gaps or air leaks.Primary Filter Cleaning Instructions (every 3 - 4 hours of run time)1. Remove the clip from the airPull to the side to remove assemblyfilter and remove from themetal hanger. Remove theair filter assembly from thecarburetor bore by pulling theentire filter assembly firmly tothe side to release it. Do notpull straight up.2. Remove the pre-filter element.3. Remove the 3x6mm screw in the end of the filter housing. Removethe front housing and the primary filter element.4. Clean the filter parts by thoroughly washing in hot soapy water(dishwashing detergent works well). Repeat twice for the foamfilter elements.5. Thoroughly dry the foam pre-filter and primary filter elementswith a clean towel. Dry the remaining filter parts.6. Oil the foam pre-filter with 24 drops of air filter oil, and theprimary filter element with 30 drops of air filter oil.7. Reassemble the filter and install it on the engine. Make sure therubber filter neck fits securely on the carb with no gaps or air leaks.20 • REVO 3.3
THE TRX 3.3 RACING ENGINETHE CARBURETORUnderstanding the Carburetor adjustmentsThe carburetor performs several functions. It controls the engine’sspeed by restricting the intake of air and fuel into the engine. Itatomizes the fuel (suspends the fuel droplets in the air) and alsocontrols the air/fuel ratio of the mixture entering the engine (howmuch air for a given amount of fuel).To help provide a betterunderstanding of engineAirtuning and why it’snecessary, the followingis a brief explanation ofFuelthe air/fuel combustionprocess that takes placeinside the engine.In order to createthe cylinder pressurethat results in power, the engine burnsthe air/fuel mixture. Both air and fuel, incorrect amounts, are needed for propercombustion. It is the carburetor’s job to mix the air and fuel together(atomize the fuel), in the correct proportion for the best possiblecombustion. This is the ideal air/fuel ratio. The ideal air/fuel ratiorequired for the engine remains roughly constant. Due to variationsin atmospheric conditions (temperature, humidity, altitude etc.) fuelflow adjustment valves (called fuel mixture needles) are requiredto meter the fuel and maintain the ideal air/fuel ratio in these everchangingconditions. For example, colder air is more dense (more airmolecules) for a given volume of air and therefore requires more fuel(more fuel molecules) to maintain the correct air/fuel ratio. Warmerair is less dense (fewer air molecules) and therefore needs less fuel tomaintain the correctair/fuel ratio. Thetuning needles arethere to adjust howmuch fuel is madeavailable for thecarburetor to mixwith the available air(atomization).Cold Air (More Dense)(Warm Air) Less DenseTHE FUEL MIXTURE NEEDLESThe amount of fuel metered and atomized by the carburetor iscontrolled by the two mixture needles, the high-speed needle andthe low-speed needle. The low-speed needle is used to meter the fuelused by the engine at idle and low rpm (part-throttle) engine speed.The high-speed needle is used to meter the fuel when the throttle isopen from part throttle to wide-open throttle (WOT). Two needles onthe TRX 3.3 Racing Engine provide precise control of the air/fuel ratioacross the engine’s entire rpm range.The maximum possiblefuel flow is alwayscontrolled by the highspeedneedle. It workslike the main water valveon a garden hose. Turnit clockwise to close thevalve, counter-clockwise toopen it. When the throttleis at idle or partially open,the low-speed needleWater Valve(Controls Overall Flow)High-Speed NeedleWater Nozzle(Controls Fine Flow)Low-Speed Needlemeters the fuel flow at the outlet (needle seat) where the fuel entersthe carburetor venturi. This second valve acts like the spray nozzleat the end of the garden hose in our example. When you acceleratefrom idle, the throttle opens and the low-speed needle is pulled awayfrom the needle seat. This allows more fuel to flow with the increasedair flow. As the throttle is increased, the low-speed needle is pulledcompletely away from the needle seat leaving it fully open. At thatpoint, fuel metering is entirely controlled by the high-speed needle.Again, using our water hose example, when the spray nozzle at theend of our garden hose is fully open, then the main water valve can beused to adjust how fast the water flows.The engine’s performance is directly linked to the fuel mixture.Richening the fuel mixture increases the amount of fuel in theair/fuel mixture ratio and leaning the fuel mixture decreases theamount of fuel in the air/fuel mixture ratio.• Slightly lean fuel mixtures deliver stronger, more efficientcombustion and more power, but with less lubrication.• Slightly rich fuel mixtures deliver cooler running and morelubrication but with slightly less power.RichenSee page 27 for moreinformation on how airdensity affects engine tuning.A “turn” refers totightening (“turning in”) orloosening (“turning out”)mixture needles. A “fullturn” refers to turning theneedle 360°, so a “1/2 turn”would be 180°, a “1/4 turn”would be 90°, and so on.3/4 Turn270°StartFull Turn360°1/2 Turn180°1/8 Turn45°1/4 Turn90°REVO 3.3 • 21
Page 1 and 2: owner ’ s manualMODEL 53097-3
Page 3 and 4: BEFORE YOU PROCEEDCarefully read an
Page 5 and 6: Made in ChinaSP 1361-R 0TOOLS, SUPP
Page 7 and 8: QUICK START: GETTING UP TO SPEEDThe
Page 9 and 10: TRAXXAS TQi RADIO SYSTEMYour Revo i
Page 11 and 12: BATTERY CARESome precautions should
Page 13 and 14: TRAXXAS TQi RADIO SYSTEM3. Walk awa
Page 15 and 16: THE TRX 3.3 RACING ENGINE INTRODUCT
Page 17 and 18: THE TRX 3.3 RACING ENGINETERMS TO K
Page 19: THE TRX 3.3 RACING ENGINETHE FUELUs
Page 23 and 24: THE TRX 3.3 RACING ENGINEInstalling
Page 25 and 26: THE TRX 3.3 RACING ENGINETank 11. D
Page 27 and 28: THE TRX 3.3 RACING ENGINEBefore you
Page 29 and 30: DRIVING YOUR REVOINTRODUCTIONYour T
Page 31 and 32: BASIC TUNING ADJUSTMENTSpush rod co
Page 33 and 34: BASIC TUNING ADJUSTMENTSMaximum Ali
Page 35 and 36: BASIC TUNING ADJUSTMENTS2. Adjust b
Page 37 and 38: MAINTAINING AND STORING YOUR REVO3.
Page 39 and 40: ADVANCED TUNING ADJUSTMENTSRocker A
Page 41 and 42: ADVANCED TUNING ADJUSTMENTSThe foll
Page 43 and 44: TQi ADVANCED TUNING GUIDEAvailable
Page 45 and 46: TQi ADVANCED TUNING GUIDETRAXXAS LI
Page 47 and 48: Set Multi-Functionknob for STEERING

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