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@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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