[Healeys] 100M cold air boxes and flow

[Adam Nolde]

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

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