<VV> Louvers and airflow

[AeroNed at aol.com]

James,
 
I did a "wind tunnel test" on an EM and a LM coupe with tuffs (little  
strips of yarn) all over the cars for the PW. The tuffs show airflow and areas  
where the air is separated from the surface. The LM vents has good airflow  
on only the outboard half to 2/3s of the vent. The Stinger vents are in a  
"good" airflow area, not a high pressure area. Having the doors open 
instantly  give a high pressure.
 
BTW The Performance Workshop in Indy is a great place to hear lots of cool  
stuff about Corvairs, it's not just about racing. Yup, that was a plug.
 
Ned
 
 
In a message dated 11/29/2010 7:25:53 A.M. Central Standard Time,  
ricebugg at mtco.com writes:

All:  As an employee of Caterpilar's Service department many  many years 
ago,
I had access to tempertute sticks/crayons.  I had a LM  with a hopped up
Turbo, and on occasion noted the engine compartment  temperture.  So one hot
90+ degree day, before leaving work, I marked  up the engine sheet metal and
chassis rails and drove it.  The color  change of the markings indicated
about 275 degs in several places with cyl  hd temp on the guage of about 400
deg. One of the reasons I normally had  the spare and tools in the trunk.

Also, again many many years ago Dave  Newell showed me drawings from
Chevrolet of the air presure on EM's deck  lid.  As I remember it, at normal
higway speed, the high pressur area,  and hence the source of air flow, was
right over the louvers.

Also  note the air flaps location on the Yenko Stinger.  According to  one
source, Yenko tested the LM in a wind tunnel to determine where the  high
pressure area was "at speed" and put the flaps there.  Of course,  the "at
speed" speed was a lot higher than any of us would try on the  street 
right?!

Historically Yours,
James  Rice



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