Here are highlights of how pros break
in and tune their nitro engines.
For more info, please visit their websites.
Also follow the engine
manufacturers' procedure on how to break in specific engines as these
vary from each other.
the GRP engine.
in with engine
installed in the car.
engine to 160-180
degrees with a heat gun before starting the break in process.
engine in rich
condition, with glow plug starter connected, wheels freely turning off
the ground for a few minutes.
engine for 4 - 5
tanks of fuel.
model on side to drain excess residue in the pipe.
run on track or
rich for 3
needle a third of a turn, run for 2 more fuel tanks.
at least 6
tanks of fuel.
Nitrotane 20% or 30% race fuel to break in engine.
same nitro content
and brand during break in and when racing.
temp range for
GRP engines is 170-200 degrees F.
run with an
oiled air filter. Change on regular basis.
a temperature probe,
that mounts on chassis of the car with a lead connecting to the head of
the nitro engine to monitor the temperature.
engine is too rich, temp
will be colder
than desired operating range.
engine is too lean, temp
will be higher
than deisred operating range,
with top end rich, should
smoke on the straightaway.
for a few laps to get
engine up to
running temp before tuning.
temp shows engine is rich
out using by turning top end screw 1/12 turn at a time
temp shows engine is lean
by turning top end screw 1/12 turn at a time counterclockwise.
try to tune a cold engine!
top end first.
tune from rich to lean. If in doubt, richen it up first.