[Healeys] 100M cold air boxes and flow

[ATIGHTPROD at aol.com]

Don't know much about the science of the cold air box, but do know that  
when holes were drilled through the rear of the box on Bruno's car on the  
Bonneville salt flats in 2009, the car went faster. And not just a little  
faster, considerably faster. You'd have to talk with him about it, for all the  
correct details, but it worked as far as getting more speed out of the  car.
Steven Kingsbury
BN1 #598
 
ps, Joe explains the process a bit in the video as we waited in  the 
staging line on day two.

 
 
In a message dated 1/18/2012 10:15:49 P.M. Pacific Standard Time,  
adamnolde at yahoo.com writes:

All,

Has anyone conducted or read the results of anyone  else's research
regarding the fluid dynamics of the 100M cold air  box?

I'm no engineer, but a
keen mind looking at the 1956 cold air  box design can quickly work out the
fact that it may have some ill effects  on air delivery at higher RPM's.  
I'm
specifically concerned about the  size and depth of the box causing delivery
issues for both, but more likely  the rear carb.  


I've done some very crude
calculations and  crude bench testing just as a base to understand the flow
involved and the  possible scale.  I've learned my engine can suck as much 
as
263CFM at  100% VE, but obviously it should be less, so I use this as a 
max. 
That  puts the velocity at each carb above 85mph static, but much faster  
during
intake stroke.  The velocity at the air box inlet is above  65mph static.  
The
box depth in front of each carb opening is only  1.75".  I can see potential
for not only vacuum creation and  inefficient atmospheric replacement, but 
add
to that the inefficient  dynamics of the flat and non radiused orifices.    
I've also  discovered a fair amount of scavenging occurs between carb  
orifices
in-spite of the wide and presumably ample open ended  box.

Anyway, I've
theorized that the probable advantage of  thermodynamic control supplied by 
the
air box, may be negated by its  inefficient design and inability to supply
sufficient volume.

If  anyone has done or knows of some CFD (computational
flow dymanic) modeling  and, better yet, 3d image modeling.  Please let me 
know
where to  access the information.

Thank you and kind regards,

adam  nolde
203-606-4675

[demime 1.01d removed an attachment of type  image/jpeg which had a name of 
 100M.jpg]
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