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
- A term that refers to how quickly the
model responds to throttle input or how
quickly it accelerates.
Rich
- A running 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.
