[MV] Compressing Diesel fuel

Andreas Mehlhorn (a.mehlhorn@t-online.de)
Thu, 28 Jan 1999 07:14:56 +0100

jonathon schrieb:
> >you may get diesel ignition inside the control cylinder.. yeowie.
> Diesel (compression) ignition??? Don't you need air (oxygen) for
> it to ignite??

You can't ignite Diesel fuel only with high pressure. In the cyclinder
the Diesel fuel is ignited by the heat. The compression of the air
heats up the air (according to the physical laws of compressing gas).
When the Diesel fuel is injected into the cylinder with the hot air,
the temperature of the hot air ignites the fuel.

In a hydraulic system you can compress diesel fuel so much as you want=20
and nothing happens. Note that modern Diesel ignitions systems (common
rail) are working with pressures of up to 2000 bar (30,000 psi) in
the injection pump and pipes. This means the liquid Diesel fuel is
under such a high pressure in the injection pump and the tubes to the
injectors. Did you ever hear that Diesel fuel ignited in the injection

A Diesel engine has not a compression ignition, to be more precise it
is a compressed air ignition.

Best regards

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