[Healeys] FW: 100M cold air boxes and flow

David Porter frogeye at porterscustom.com
Thu Jan 19 06:38:16 MST 2012


OTOH.. if you ask any HVAC guy he can tell you how much flow efficiency is
lost with simple bends in a duct. And the two nearly 90 degree bends are
killers.
 I use velocity stacks and the old engine will pull till it runs out of
carburetor.. :~)
Dave

frogeye at porterscustom.com

Porter Customs   2909 Arno NE
Albuquerque, NM USA 87107
505-352-1378
1954 BN2  1959 AN5
Porter Custom Bicycles

cars:
 www.britishcarforum.com/portercustoms.html
gallery:
http://picasaweb.google.com/porterscustombicycles/PorterCustomBicyclesStuff

GO HERE: http://porterbikes.com/  nice pictures-fun facts-my world


Adam -

Any flow inefficiencies in the cold air box design are overcome by the
positive air differential created by having the front end of the CAB
paper tube face directly forward into the oncoming air stream when
driving at high speed.  In fact, the speed ram effect will provide
more HP improvement than having cold dense air going into the carbs.

If you look at pictures of some 100S/4 racers in the day, many of the
cars have run the paper air tube past the grill or even through the
shroud into the oncoming air stream to maximize positive pressure in
the CAB.

It's about the air pressure, not the air temperature.  Basically it's
a cheap supercharger when you are driving fast.

Alan


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