[Mgs] Hood Louvers

[Paul Hunt]

Low or high?  High surely, which is why air *is* forced through the heater and
fresh-air vents when underway.  Vents further forward will be affected by the
Bernoulli effect and will suck air out of the louvres, it is the angle of the
screen and the effect on air flow that changes it to high pressure at the base
of the screen.  If you have heat problems while driving then there is
something else wrong, ram air forced in the front will exit downwards from the
sides and rear of the car even though that is counter to natural convection
and should be more than enough for engine cooling.  Louvres will allow some
heat escape at a standstill which could be beneficial, and some people remove
the foam sealing strip at the back edge of the bonnet opening for a similar
effect, as would jacking up the rear edge of the bonnet.  However you must
bear in mind that these as well as louvres will result in any fumes from the
engine compartment being pumped through the heater and fresh-air system into
the cabin.

PaulH.
  ----- Original Message -----


  I believe that nearest the bottom of the screen is low pressure so
  air will be sucked down into body