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4
p
REpARATION
4.10
R
uNNING
f
:
uEL
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.
1. I
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NITIAL BREAk
IN pHAsE
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.
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.
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Leave the plug connector inserted and let the engine warm up for approximately 1 minute without accelerating.
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If necessary, unscrew the main nozzle needle a little (the flow rate will be bigger)
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Remove the plug connector after one minute warming up phase.
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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.
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Switch the engine off after –3 minutes
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Let the engine cool down for approximately 10 minutes.
2. I
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NITIAL BREAk
IN pHAsE
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Set the engine slightly leaner by turning in the main nozzle needle by an eighth of a turn and start the engine again.
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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.
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Stop the engine again and
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let it to cool down for 10 minutes.
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Repeat this procedure and make the mix slightly leaner each time.
3. I
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NITIAL BREAk
IN pHAsE
Three 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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Enrich the mix by adjusting the main nozzle needle again, but keep the setting lean so that the model runs perfectly.
NOTE! It is always extremely important not to make the mix too lean!
Keep in mind that the engine lubrication is effected via the oil contained in the fuel.
Too little oil in the air/fuel mix causes engine overheating and piston seizure due to inadequate lubrication.
During operation, a light white trail of smoke coming out of the exhaust pipe should always be visible.
If this is not the case, stop the engine immediately and enrich the mix.
Also make sure that sufficient air circulates around the cylinder head, in order to avoid overheating.
If necessary, effect a corresponding opening in the car body.
The optimal engine operating temperature is approx. 100 – 120°. Check the temperature with a drop of water on the cooling head. If
the water evaporates abruptly, the engine is too hot.
In operating temperature, the water evaporates in 3 – 4 seconds.
© REELY 01/08
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IN REGuLATIONs fOR THE ENGINE
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47
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