On 24/08/15 18:04, Adrian wrote:
On Mon, 24 Aug 2015 16:55:57 +0000, Johnny B Good wrote:

Compression of the mixture?

No, just compression of the impounded air. There is no 'fuel/air
mixture' as such. The fuel is sprayed into the cylinder at very high
pressure to overcome the 'back pressure' of the compressed and heated
air where it is immediately ignited on contact with the air

Indeed. Which is precisely why the timing of the injection is so
important on a diesel.

well of cpurse you are talimng direct njection.

Earlier diesels injected fuel into the inlet manifold and it was that
fuel air mixture that got compressed and went bang...

Oh and glow plugs play no part ion a diesel that is running.

C0old start only.


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