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B9 "loads of water coming out your exhausts mate"

terminator x Dec 10, 2018

  1. terminator x

    terminator x Registered User

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    So I overtook someone today on a DC and we both stopped at some lights shortly after. This chaps toots me, I look over and he says "you have water coming out your exhaust". I replied "probably just cold" to which he replied as thread title above. Is water from the exhaust ever indicative of "a problem" and just out of interest why does it happen as I see it all the time on other cars?

    TX.
     
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  3. daytonamart

    daytonamart Moderator Staff Member Moderator

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    I'd suggest it just a build up of condensation, nothing to worry about.

    I've seen water pile out of the back of a B7 I was following once, same time of year.
     
  4. Daggerit

    Daggerit Registered User

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    Agreed. Because it’s cold outside it’s more prone to condensation build up.


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  5. JamesBaby

    JamesBaby Registered User

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    When petrol is burnt it produces CO2 and water vapour.

    When the car is cold it will run a specific mixture that may result in more water vapour


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  6. Chris518

    Chris518 Registered User

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    All above is correct . That is why if a vehicle constantly does short runs the exhaust can't "dry out" and that is why they rot (mild steel ones anyway)
    Chris
     
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  7. Peter123

    Peter123 Registered User

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    ....and they now make exhaust silencers with a hole in them to drain the water away after the car has stopped.
     
  8. terminator x

    terminator x Registered User

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    It does a reasonable amount of short local runs so probably this then.

    TX.
     
  9. Arcam

    Arcam Registered User

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    For every gallon of petrol you burn you produce a gallon on water.

    When cold this is seen as liquid at the tail pipe changing to the familiar white vapour as the exhaust which was acting as a condenser warms up. Once the exhaust is fully warm and the ambient temp above the due point you should see nothing.

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  10. Peter123

    Peter123 Registered User

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    As stated previously. This applies more on short runs when the system is not up to temperature.
     
  11. cuke2u

    cuke2u Well-Known Member

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    It's not entirely down to cold weather either, if the humidity is high any water molecules produced by the exhaust cannot be absorbed by the air, thus it stays as water...
     

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