"Harry Bloomfield" wrote in message
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NY explained on 23/07/2018 :
How would the sump oil find its way into the cylinder? Via leaky piston
rings? I presume top gear and hard on footbrake *should* stall the
engine.

There are various ways for the engine oil to get into the combustion
chamber, there are numerous examples on Youtube of runaway diesel engines.
Some have even tried to use it as an excuse for speeding for tens of
miles. The footbrake certainly 'should' be able to stall the engine, the
engine will have much less power available than normal.

I've vague memories of something my dad told me long time ago. He was first
on the scene at a lorry accident (fortunately no-one was hurt) and he tried
to turn off the lorry's engine at the ignition key. It carried on going. The
driver told him to pull a lever somewhere and there was a lot of hissing and
spluttering and the engine gradually stopped. Now the obvious thing that a
lever would operate would be a fuel shutoff that was independent of the
solenoid that was kept open by the ignition switch, but that doesn't match
the hissing and spluttering. It make me wonder whether some lorries had a
means of venting the cylinders to the atmosphere as a crude way of breaking
the cycle and stalling the engine - maybe by holding the exhaust valve open
during the compression and power stroke to avoid the compression ignition.

Was that ever done as a way of stalling an engine to turn it off. It would
have been in the late 60s, so whatever technology (mechanical fuel pump and
injectors) was around at the time. Not sure whether it was 2-stroke (eg
Commer "Knocker") or 4-stroke.