NITRO ENGINE TUNING
Tuning of nitro engines for racing is very essential activity that is
essentially required for deriving optimum performance of the engine.
If the engine is cleaned as well as if bottom end and top end are tuned
properly then nitro engines give maximum performance and longer run
It is important to clear the engine of debris in preparation for race
tuning. This debris or contaminants cause blockages in air flow or fuel
intake. This may result in too rich or too lean mixture. Such an irregular
flow of the mixture in to the engine does not give optimum performance.
It may also cause stalling or starting problems of the engine. In order
to clear the engine a step but step guidance is useful.
Raise idle to 1/4 turn. This will help prevent engine from stalling.
This is the idle screw and not the low-end needle. Next you would need
to check on the engine temperature. An engine temperature up to 150
degrees is required. A rich fuel mixture is required. In order to achieve
this richen top end by a full turn. This should be done by holding the
carburetor wide open and richening should continue till engine nearly
stalls. This flushes out dirt, residue, or after-run oil from the carburetor
and the engine as well.
After this tuning of the bottom end is required. It is essential to
get acquainted to the sounds and humming of the engine in order to tune
your engine to the best. Listening to the idle is the first step toward
tuning the bottom end. If the idle slows and engine stalls then the
bottom-end needle needs to be stalled. But if the idle speeds up then
bottom needle needs to be richened out. The engine needle should be
set to idle for at least one minute before the engine starts to stall.
Once the idle is consistent for one minute then idle screw should be
lowered as much as possible until engine stalls. Then the idle screw
should be opened up to the setting of one-eighth of the turn. Engine
should be idle at least for more than forty-five seconds consistently.
After the bottom end is tuned in the top end needs to be tuned. To begin
tuning the top end full throttle needs to be opened for at least two
to three seconds and then the same should be returned to idle position.
The top end needs should be leaned out after listening to the engine
until a nice clean sound is heard. Then the carburetor needs to be opened
to full throttle for two to three seconds and closed for the same amount
of period. This should be repeated one or two times. This should make
rev nice and clean after the repetitions.
If the engine hesitates after this it is an indicative of too lean mixture.
In order to resolve the same the top needle needs to be richened. A
proper tuning of the engine should resolve the problem of stalling of
engine or if the engine is giving shorter run times. If the problems
persist then trouble shooting of the fuel system may be required. But
the best shot would be to take an expert’s opinion.
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