Traxxas TRX 2.5R Manuale utente

OWNERS MANUAL

™

TRX 2.5R •2

Traxxas

1100 Klein Road

Plano, Texas 75074

Phone: 972-265-8000

Toll-free 1-888-TRAXXAS

Traxxas U.K.

P.O. Box 1128

Winterbourne, Bristol BS36-2SH, England

Phone: 44-117-956-1002

Internet

www.Traxxas.com

e-mail: [email protected]

or registered 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 mounts, that are not included in the engine package. See the end

panel of the engine box for exact contents based on your engine model number.

TRX 2.5R •3

Before You Proceed

Carefully read and follow all instructions in this and any accompanying materials to prevent

serious damage to your engine. Failure to follow these instructions will be considered abuse

and/or neglect. Before running your TRX 2.5R Racing Engine, look over this entire manual and

examine it carefully. If for some reason you decide the TRX 2.5R is not what you wanted, do

not continue any further. Your hobby dealer absolutely cannot accept a TRX 2.5R for return

or exchange after it has been run.

Warnings, hints, and cross-references

Throughout this manual, you’ll notice warnings and helpful hints, identified by the icons

below. Be sure to read them!

An important warning about personal safety or avoiding damage

to your TRX 2.5R Racing Engine and related components.

Special advice from Traxxas to make things easier and more fun.

Refers you to a page with a related topic.

Support

If you have 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 [email protected]. Join thousands of Traxxas R/C

enthusiasts in our online community at www.Traxxas.com.

Traxxas offers a full-service, on-site repair facility to handle any of your Traxxas service needs.

Maintenance and replacement parts may be purchased directly from Traxxas, or you can save

shipping and handling costs by purchasing them from your local hobby dealer.

4Safety Precautions

5Introduction

6TRX 2.5R Racing

Engine Illustrated

7Terms to Know

11 The Fuel

13 The Air Filter

14 The Carburetor

18 Breaking-in Your

TRX 2.5R Racing

Engine

22 Tuning the TRX

2.5R for Best

Performance

27 Troubleshooting

Your TRX 2.5R

Racing Engine

30 Maintaining and

Storing Your TRX

2.5R Racing Engine

33 Index

34 Rebuilding the TRX

2.5R Racing Engine

BEFORE YOU PROCEED

TRX 2.5R •4

All instructions and

precautions outlined in

this manual should be

strictly followed to ensure

safe operation of your

TRX 2.5R Racing Engine.

The TRX 2.5R Racing Engine

is not intended for use by

those under 16 years of

age without the supervision

of a responsible and

knowledgeable adult.

Safety Precautions

All of us at Traxxas want you to safely enjoy your new TRX 2.5R Racing Engine. Operate your TRX

2.5R sensibly and with care, and it will be exciting, safe, and fun for you and those around you.

Failure to operate your TRX 2.5R in a safe and responsible manner may result in property damage

and serious injury. The precautions outlined in this manual should be strictly followed to help

ensure safe operation. You alone must see that the instructions are followed and the precautions

are adhered to.

Important Points to Remember

• R/C fuel is dangerous and highly poisonous. Always follow all directions and precautions printed

on the fuel container.

•R/C fuel, especially when in 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 to touch

the parts, especially when refueling or stopping the engine.

•Prolonged exposure to the engine exhaust can be harmful. Avoid breathing the engine exhaust.

Always run your TRX 2.5R outdoors, in a well-ventilated area. Never run the engine indoors.

•Don’t operate your model at night or anytime your line of sight to the model may be obstructed

or impaired in any way.

•Never operate your model in crowds of people or busy pedestrian areas. The TRX 2.5R makes

models extremely fast and may cause injury to those unaware of its presence.

•The engine can be loud. If the noise makes you uncomfortable, wear ear protection. Be

considerate of your neighbors by not running your model early in the morning or late

in the evening.

•

Most importantly, use good common sense at all times.

SAFETY PRECAUTIONS

TRX 2.5R •5

Introduction

The TRX 2.5R Racing Engine is vastly superior to

typical R/C engines and belongs in the category of

specialty high-performance racing engines. It’s the

result of years of focused engineering development,

and thousands of hours of controlled testing and

rigorous real-world running. It offers unprecedented

power and performance that turns ready-to-run into

Ready-To-Race®.

The TRX 2.5R Racing Engine takes a total-system

approach. Each part of the engine, from the air filter

to the exhaust tip, is carefully engineered to work in

harmony with other engine components. Each part

complements the next, to extract maximum power.

The TRX 2.5R is designed to be tolerant of variations in tuning and running through a

wide range of variable atmospheric conditions, such as changes in temperature, humidity,

and altitude.

The TRX 2.5R is manufactured to exacting tolerances and requires a specially-designed break-

in procedure to accomplish the final precision fitting of the internal engine components. It is

very important that you follow 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.

Aroutine maintenance schedule is also required to keep the TRX 2.5R in top running

condition. Cleaning the air filter after each hour of running is particularly important. Also it is

extremely important to perform after-run maintenance on the engine to prevent corrosion of

the internal engine components (see page 30).

Traxxas strongly

discourages changing or

modifying any part of the

TRX 2.5R Racing Engine.

Old tech tips and tricks

that may have boosted

the power of other

engines could seriously

diminish the performance

of the TRX 2.5R.

There’s more advanced

thinking, development

and testing in the stock

parts of your TRX 2.5R

than in many aftermarket

manufacturer’s so-called

performance parts. The

TRX 2.5R is already one of

the most powerful

engines in its class and

simply will not benefit

from average, low-tech,

aftermarket bolt on

performance items.

INTRODUCTION

TRX 2.5R •6

TRX 2.5R ILLUSTRATED

Air Filter

Base Head Protector

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

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

achrome-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

abrand 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

anoticeable 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.

TRX 2.5R •8

TERMS TO KNOW

Cooling fins -The cooling fins are milled into

the cylinder head and crankcase and cause

heat to be drawn away from the engine. Heat

is removed when it dissipates into the air

passing across the cooling fins. It is important

to keep the fins clean of dirt

and debris for maximum cooling efficiency.

Cylinder head (head) -The finned aluminum

part on top of the engine that is responsible

for dissipating most of the engine’s heat. The

combustion chamber is machined into the

bottom of the head.

Dyno -Abbreviation for dynamometer. A

precise piece of testing equipment that

accurately measures engine power and

torque output over the engine’s entire

RPM range.

EZ-Start -Traxxas on-board electric starting

system. The system consists of a hand held

starter control unit and an on-board gearbox

with an electric motor to spin the engine.

Filter foam -The oiled foam element inside the

air filter housing. The filter foam in the TRX

2.5R must be thoroughly cleaned and re-oiled

after every hour of run time.

Fit -Usually refers to the fit of the piston 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 have

model engine fuel to run. Traxxas Top Fuel™

is recommended. Fuel is sold in quarts and

gallons from hobby dealers. The 10% and

20% labeling refers to the percentage

amount of nitromethane contained in

the fuel (see “nitro percentage” definition).

Fuel mixture -The ratio of fuel to air as

determined by the needle settings of

the carburetor.

Fuel tubing (fuel line) -The thick silicone

tubing that carries fuel from the fuel tank

to the carburetor.

Glow plug -The glow plug is located in the

cylinder head at the top of the combustion

chamber. It contains a platinum element that

glows red hot when voltage is applied. When

the engine is being started, the heat from the

glow plug ignites the fuel mixture and starts

the combustion process.

Glow plug driver -This tool clips onto the glow

plug and supplies the required voltage to

light the glow plug element. It is also called

TRX 2.5R •9

TERMS TO KNOW

an igniter. EZ-Start equipped engines do not

require this separate tool.

Header -The aluminum tube that connects

the exhaust system to the engine exhaust

port. The length and diameter of the header

must be carefully selected to extract the

most power from the engine.

High-speed needle (HSN) -Adjusts the

carburetors fuel/air mixture at high RPM.

Idle speed -The speed (RPM) the engine

runs at when the transmitter’s throttle

trigger is at neutral.

Idle speed screw (ISS) -Located on the

carburetor body. This screw adjusts the idle

RPM of the engine.

Lean -Arunning condition where the

engine is not getting enough fuel (for the

available air). Symptoms include engine

overheating, or the engine runs for a short

time and then stalls, particularly at high

speed. This is a dangerous condition that

should be corrected immediately or it can

ruin your engine.

Leaning the mixture -Turning either the

high speed and/or low-speed needle(s)

clockwise to decrease the amount of fuel

the engine receives.

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,

acomponent 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 content -The amount of nitromethane

used in the fuel. Usually measured as a

percentage of the total fuel volume. Traxxas

engines are optimized to use 10-20% nitro.

30% nitro may be used for racing.

Nitromethane -Nitromethane is a component

in the fuel that increases power from the

combustion process up to a point. Engines

are generally optimized to use a range of

nitro content for the best power.

O-ring -Rubber “O”-shaped ring used as a

sealing gasket.

Pipe -Abbreviation for the tuned exhaust pipe

on a nitro engine. See “Tuned Pipe”.

Piston -The piston is the internal engine part

that is attached to the upper end of the

connecting rod and moves up and down in

the cylinder sleeve. The precise fit between

the piston and the sleeve creates a seal that

allows engine to have the required

compression for combustion.

TRX 2.5R •10

TERMS TO KNOW

Port -Ports are openings in the sleeve that

allow atomized fuel to enter the combustion

chamber and burned exhaust gasses to exit.

The shape and location of the ports are a

large factor in controlling the engine timing

and power output.

Priming -Manually causing fuel to move from

the fuel tank up to the carburetor. This is

sometimes necessary after the engine has

been sitting for a long period of time and all

of the fuel has drained back to the tank. On a

Traxxas model this is done by holding your

finger over the exhaust tip for one or two

seconds while the engine is starting.

Punch -Aterm that refers to how quickly the

model responds to throttle input or how

quickly it accelerates.

Rich -Arunning condition where the engine is

getting too much fuel for the available air. It

is better to run an engine slightly rich to

increase engine life. Excessively rich mixtures

cause the engine to have sluggish

performance with exaggerated blue smoke

and 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.

Slide carburetor -The throttle on a slide

carburetor closes and opens by sliding a

barrel in and out of the carburetor body.

This type of carburetor is preferred for

performance use because it provides a

less restrictive “straight-through” air path

than the barrel carburetor design.

Stall -When the engine stops running, usually

due to an incorrect fuel mixture setting or

running out of fuel.

Tuned pipe -The tuned exhaust pipe usually

consists of a specially-shaped metal or

composite chamber with baffles that is

designed to enhance the power output of

the engine.

Wear-in -Fitment process that occurs during

engine break-in where internal engine parts

develop an even more precise matched fit

through actual use under controlled

circumstances.

WOT -Abbreviation for wide-open throttle.

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