I guess you caught me in a little mis statement. It is true that if there
were no airflow in the engine bay the car would overheat. Obviously I have
airflow as engine temps are very agreeable, again you are correct that I
really want airflow over the top of it. One of the listers on mgs suggested
the louvers, even though they would be inflow, would create airflow in the
area I covet.
That is an interesting idea about the wheel arch box sections but I don't
think you would move sufficient air without opening the area up to the
outside of the car, and I think that would just cause more bad then good.
As I said, I don't know for sure but I think the wheel arches are high
pressure areas.
I wish I was such a person that would ever get around to mapping the airflow
over the car but I doubt I will ever get around to it. I think that there
are some interesting airflow patterns on the sides of the car, as under
certain conditions, namely with one window down, I can smell the exhaust
from my sidepipes being sucked into the cabin. With all windows open or
with all closed I don't smell anything, I would like to figure this out one
day, but it is just easier to crack another window then worry about the aero
on the sides of a street car.
James Nazarian
71 MGB Tourer
71 MGBGT V8
85 Dodge Ram
----- Original Message -----
From: "Telewest (PH)" <paul.hunt1@blueyonder.co.uk>
To: "James Nazarian" <jhn3@uakron.edu>; "v8" <mgb-v8@autox.team.net>
Sent: Wednesday, August 20, 2003 4:26 AM
Subject: Re: timing
> James - once under way I would have thought that incoming air pressure
would
> have forced the exit of hot air anyway it could, like from the bottom even
> though that is contrary to normal convection, and this is indicated by the
> temp gauge going down and staying down once underway again after a stop.
> While stop even the chronically inefficient factory fans have enough oomph
> to blow air out from under the arches, and I don't have the RV8 cutouts in
> the inner wings. However I have wondered about cutting holes in the
> box-sections that go from the holes at the top back of the inner wings to
> the A-posts, either into the cavity behind the splash panel with another
> hole in that (which will probably just allow water and dirt to fill up the
> space behind it (or direct into the arch area. This would allow an air
flow
> at the top back of the engine compartment which as you said before is
> largely stagnant air.
>
> As far as bonnet pressure goes I have noticed that it tends to *lift* at
> speeds over 55mph, and there have been several posts in the past about the
> bonnet wrapping itself over the screen at higher speeds when the catches
> have failed. E-Type Jag louvres seem to extend forward from the base of
the
> screen slightly *less* then the height of the screen. It would be
> interesting to tape some wool to various of those and see which way the
> airflow goes at various speeds, and it would also be interesting to tape
> some to the unlouvered MGB bonnet at various points along its length and
> across its width.
///
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