Lzo asked in Cars & TransportationAircraft · 1 decade ago

why do jet engines always puff white smoke before the flame?

If you look at any youtube video of a jet engine in a drag car or boat, you always see them spouting clouds of white smoke before the 'fire' part of it. why's that?

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  • 1 decade ago
    Favorite Answer

    They shoot water in them to create steam as part of the show. The same for the big flame. Otherwise, it would just be loud turbine noise.

    If these people who gave me a thumbs down even looked at a video, or had been to the drags to see the jet cars, they would know what we are talking about. They do it over and over.

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  • 1 decade ago

    The inital dump of jet fuel( kerosene like) doesn't completely combust til engine spools up in rpm getting more compression & complete combustion

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  • 1 decade ago

    it is a mixture of cold oil, fuel vapour, unburnt hydrocarbons and free carbon. its beacuse initially the engine does not reach its optimum working temperature.

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  • 1 decade ago

    It is fuel vapor.

    .

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  • 1 decade ago

    it is fuel burn off

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