<VV> Air flow question

[Robert K. Henry]

I have observed that my convertible runs a smidge hotter (as measured by
factory CHT gauge) when the top is down at Interstate speed (70 MPH). I
assumed it was because air flowing over the top and down the plastic window
was directed into the intakes. It's such a tiny difference that I haven't
worried about it, just noticeable on the gauge. I can only guess what the
air is doing differently when the top is down--probably turbulent air over
the intake. 

Robert Henry
65 Corsa turbo convertible

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Jim Briggs
Sent: Saturday, September 12, 2009 4:45 PM
To: virtual vairs; fastvair at yahoogroups.com
Subject: <VV> Air flow question


I'm trying to figure out if the air pressure over our LM air intakes behind
the rear glass is +positive or -negative and how much.
I've looked at the pictures on AeroNed's site but they are not diffinitive.
I've even tried my own rudimentary string test.
Has there been any measurement testing done out there? I'm trying to
determine which way to flow the air through the 
horizontal radiator above the transaxle on my rear engine V8 project. It's
obvious that with a closed engine compartment
our air cooled Vairs can "pull" enough air for cooling but I'm trying to
figure out if there is significant positive pressure aiding 
the cooling fan?
 
Thanks for any help!
Jim Briggs
65 coupe & sedan
66 Corsa V8

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