No, the base of the windscreen is a high-pressure area (the air passing over
the bonnet "jams up" against the windscreen). But you are correct in that
that is why the air intake is located there (other than from general
convenience).
Low pressure would typically be along the flat area in the middle of the
bonnet. The E-Type has an enormous flat area, so this could work well. The
B's bonnet slopes up most of the way, which might maintain a certain amount
of positive pressure. Also, the underhood area behind the radiator diaphragm
is pretty well sealed, so it doesn't build up a lot of positive pressure
inside, either, so there wouldn't be a lot of pressure differential at the
louver location.
I saw a Sunbeam Tiger once that had engine heat vents in the wings, with
thermostat-controlled fans. This would probably be effective. But I wasn't
aware that under-hood temperature was a big problem on MGBs, anyway.
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 7/25/09 10:03 AM, Barrie Robinson at barrie@look.ca wrote:
> I believe that nearest the bottom of the screen is low pressure so
> air will be sucked down into body - that is why the cool air vent for
> your feet is there. Makes sense when you eyeball the shape. But the
> engine bay area is too far away for louvers on the bonnet to work.
>
>
> At 12:48 PM 7/25/2009, Rod Williams wrote:
>> On Jul 25, 2009, at 6:21 AM, Matthew Milkevitch wrote:
>>
>>> Has anyone ever installed hood louvers in their MGB..
>>
>> I sold a 1966 'B to a guy who did a lot of customization to the car
>> including punching louvers into the alloy bonnet. Although they looked
>> *really* nice, he later told me that they didn't do a whole lot to
>> lower the air temp. He experimented by taping small tufts of yarn at
>> different points on the louvers and then driving at various speeds,
>> and discovered that the last two louvers nearest the cowl actually
>> pulled air in rather than providing an exit for air. He had 8 or so
>> (can't remember) louvers stamped on each side near the outside edge of
>> the back of the bonnet, perhaps 8 or 10 inches from the cowl. Sort of
>> like on a Jaguar E-Type. He had them done by a local custom shop with
>> a louver punch and they did a very nice job. Perhaps the location of
>> the louvers would make more of a difference, but how would you
>> experiment? My old XKE had the louver patches on the bonnet and it
>> seemed that heat came roaring out of them. (especially the time the
>> electric radiator fan died!)
>> --
>> Rod Williams
>> Petaluma, California
>> 1967 MGB
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>
> Regards
>
> Barrie
> (705) 721-9060
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