rgava wrote: ↑23 Aug 2018, 20:21
Tommy Cookers wrote: ↑22 Aug 2018, 15:14
GDI particulate is better than CI's because gasoline burns readily and diesel doesn't
diesel particulate carries on its surface aldehydes from incomplete reactions - these are precursors to carcinogens
whether from diesels or modern-day cooks baking with oils they wrongly think are better than the old-style cooking 'fats'
I don't know honestly.
Correct me if I'm wrong but particles are always the result of incomplete reactions, so perhaps we will find the same aldehydes on the particles of a GDI engine.
incomplete reactions are where the fuel is very hot but not in contact with enough oxygen
ie fuel droplets don't burn but fuel vapour does
this will always be worse with diesel fuel (than gasoline) as diesel vapourises less due to its higher BP (and viscosity ?)
I was somewhat speaking in support of VW etc
do modern diesels produce less carcinogens (as notionally less particulates) ? because eg their fuel droplets are smaller
or is the particulate trapping/burnoff the mechanism for attribution as low particulate
yes urban/domestic sources of NOx (and ozone) aren't inconceivable - though I haven't found anything on this
in London they aim legally to prove one child has died of (particulate) air pollution via a fatal asthma attack
urban/domestic sources are rather particulate-free - except for the woodburning that has been brought in to save the world
the (UK) National Health Service is now telling us to avoid in our baking anything more than light browning
(as I rather unwisely was telling my mother over 50 years ago)
and literally today we're told the daily glass of red wine recommended against heart attacks is giving us cancer