Glowplug - O.S. engine FS-52S Owner's Instruction Manual

Model engine fuel is also highly flammable.
Keep it away from open flame, excessive heat,
sources of sparks, or anything else which
might ignite it.

GLOWPLUG

The FS-52S is supplied with an O.S. Type F glowplug,
specially designed for O.S. four-stroke engines.
The role of the glowplug
With a glowplug engine, ignition is initiated by the
application of a 1.5-volt power source. When the
battery is disconnected, the heat retained within the
combustion chamber remains sufficient to keep the
plug filament glowing, thereby continuing to keep the
engine running. Ignition timing is 'automatic' : under
reduced load, allowing higher rpm, the plug becomes
hotter and, appropriately, fires the fuel/air charge
earlier; conversely, at reduced rpm, the plug become
cooler and ignition is retarded.
Glowplug life
Particularly in the case of very high performance
engines, glowplugs must be regarded as expendable
However, plug life can be extended and engine
performance maintained by careful use, i.e.:
•
Install a plug suitable for the engine.
•
Use fuel containing a moderate percentage of
nitromethane unless more is essential for racing
events.
•
Do not run the engine too lean and do not leave the
battery connected while adjusting the needle.
When to replace the glowplug
Apart from when actually burned out, a plug may
need to be replaced because it no longer delivers its
best performance, such as when:
•
Filament surface has roughened and turned white.
•
Filament coil has become distorted.
•
Foreign matter has adhered to filament or plug
body has corroded.
•
Engine tends to cut out when idling.
•
Starting qualities deteriorate.
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