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post #28 of (permalink) Old 10th July 2008
Technical Supremo

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It may help if to realise there is no such thing as suction in the world of physics. Whether its in a jet engine, turbo or vacuum cleaner there are only areas where there is a pressure difference and a gas will always flow from a high pressure area to an area of lower pressure. All engines are under air pressure (unless you are in space) and that is whatever the ambient air pressure happens to be at the time. This can vary depending on altitude and weather. Engines always run best on clean dry air as any moisture contained in it will mean less oxygen content.
Diesel engines can't pre-ignite as petrol engines can simply because there is no fuel present until the injector introduces the fuel just before maximum compression in the cylinder when the tempertures are raging hot enough to ignite the fuel/air mix.
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