DRIVING FROM NEW
27
valve. Avoid possible damage resulting from such a condition, by
having the compression pressures checked early in the life of the
engine after "running-in" is completed. If the pressures are unequal,
valve grinding is recommended.
Further attention to the valves should not then be required for a
considerable mileage, or until the pressures have again become
unequal.
Recommended Speed Limits
Although no specific speeds are recommended during the
running-in period, avoid placing heavy loads upon the engine, such
as using full throttle at low speeds or when the engine is cold.
Running-in should be progressive and no harm will result from the
engine being allowed to "rev" fairly fast for short periods provided
that it is thoroughly warm and not pulling hard. Always select a
lower gear if necessary to relieve the engine of load.
Full power should not be used until at least 1,000 miles (1600
km.) have been covered and even then, it should be used only for
short periods at a time. These periods can be extended as the engine
becomes more responsive.
Avoid over-revving, particularly in the lower gears. The driver
is advised not to drive the car continuously at engine speeds over
6,000 r.p.m., indicated by the beginning of an orange segment on
the tachometer, in any gear. However, whilst accelerating through
the gears it is permissible to attain 6,500 r.p.m. for short periods,
this speed being indicated by the end of the orange segment.
Recommended Fuel
The "Spitfire Mk. III" engine is designed to operate on fuels
having a minimum octane rating of 97 (Research Method). Using
fuel of this, or higher rating, the static ignition timing should be 60
B.T.D.C.
Where such fuels are not available and if, therefore, it
becomes necessary to operate on fuels of lower or unknown
rating, the static ignition timing must be retarded just sufficiently
to prevent audible detonations (pinking) under all operating
conditions. Failure to do so may result in serious damage to the
engine.
Driving Hints
Ensure that the gear lever is in neutral before attempting to
start the engine.
Do not continue to operate the starter switch if the engine does
not fire. This will quickly discharge the battery. Switch off the
ignition when the engine is stationary. If left on for long periods,
this also will discharge the battery.
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