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4WD MonsterTruck Destroyer XXL 1:8 No. 3 58 10
i) Running-in regulations for the engine
The following must be observed during initial break-in:
Low engine speed
Rich fuel-air mix
Short runtimes with cooling down phases (each phase approx. 3 minutes)
Runtimes (mere engine runtime) totaling approx. 45 minutes
Fuel
The addition of nitromethane in the model fuel increases the ignitability of the fuel and thereby the performance of the engine.
Use in the break-in phase a model fuel with a small percentage of nitromethane
in order to avoid overheating the engine. Furthermore, the fuel
should have a higher percentage of oil (“rich” carburettor setting), so that the lubrication of the engine is improved, until piston and cylinder liner are run in.
After having filled in the fuel and started the engine as described above, you can start the run-in of the
engine.
Prop up the model for starting so that the wheels hang freely in the air!
In order to be able to use the full power spectrum later on, the engine should have two to four tank fillings at a “richer” carburettor setting,
and run with changing throttle.
This is indicated by the strong white smoke emission from the exhaust pipe.
1. Initial break-in phase
After each engine running (tank filling), allow for a sufficient cooling phase.
Afterwards, the mix can be made leaner by screwing in the main nozzle needle step by step.
Leave the plug connector inserted and let the engine warm up for approximately 1 minute without accelerating.
If necessary, unscrew the main nozzle needle a little (the flow rate will be bigger)
Remove the plug connector after one minute warming up phase.
Let the engine run for about – 3 minutes with cooling down phases in between.
Increase the speed slightly with short throttle bursts.
The engine runs very roughly and the model moves very reluctantly.
Switch the engine off after –3 minutes
Let the engine cool down for approximately 10 minutes.
2. Initial break-in phase
Set the engine slightly leaner by turning in the main nozzle needle by an eighth of a turn and start the engine again.
Let the engine run again for about – 3 minutes with cooling down phases in between.
Now the engine should accept the throttle a little better, but there is still smoke.
If the engine revs up briefly then stalls, unscrew the main nozzle needle slightly once more.
Stop the engine again and
let it to cool down for 10 minutes.
Repeat this procedure and make the mix slightly leaner each time.
3. Initial break-in phase
T
hree more tank fillings,
the vehicle can now be run
at a slow speed
(
max. 1/2 throttle).
A mix that is too lean causes overheating and engine seizure.
For a long engine life you should prefer a slightly rich carburettor setting and a fuel with a sufficient percentage of oil (min. 0%) is favored.
Overall, the real driving time (engine run time) should be approximately 45 minutes.
After this time, the engine should be run-in. You know that the engine is run in when it can be cranked up in a cold state and without glow plug and without
noticeable resistance.
Now you can operate the engine with full power.
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