| dc.description |
The literature shows conflicting evidence on the effect
of engine speed upon tendency to pre-ignition. Typical published
results are presented and compared, together with results obtained
from a single-cylinder D.V.L. engine at Cranfield, using the heated
wire and ionization gap technique.
The D.V.L. results show an initial increase in pre-ignition
tendency with increase in engine speed, followed by a reduced
tendency with further increase in speed, and are thus similar to
certain other published results. The D.V.L. results are less
detailed than these published results, since no measurement was made
of hot-spot temperatures, but are more extensive since a greater
number of fuels was tested for speed effect, and pre-ignition
tendency with speed was measured over a range of (reduced) inlet
pressure. |
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