On a mission

[BAZZER1]

Hi All
Can anyone tell me if the weather makes any difference to a cars emissions ??? for example: Hot Weather & Cold Weather/ Wet or Dry Day.
BAZZER1

 

[grober]

Cold weather is going to markedly increase emissions since low temperatures will require fuel enrichment to achieve stable low speed engine running. Transmission drag will also increase due to increased fluid viscosity although newer oils/fluids are better in this respect. Wet and dry is more problematic but would be related the engine air charge density- I would venture that a little more moisture in the air would be a good thing but might negated if its accompanied by lower temperatures- pretty sure all the emission tests will done under standard conditions of air temperature and humidity.

 

[BAZZER1]

Thanks for the informative reply, I now know a little more about this.
Cheers Mate
BAZZER1