<VV> VirtualVairs Digest, Vo

[bub049 at comcast.net]

 Original Message: 



> Date: Sat, 12 Sep 2009 13:45:09 -0700 
> From: Jim Briggs < jim_a_b3 at hotmail.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 


Jim, 



Many years ago, i was helping a buddy who had put a 215 Olds in the back of a 65 Corsa. He was a great metal fab man and created his own mounts and bell housing (heli-arced) and such. He was trying to use the stock air intake for cooling the radiator. No good. We ran a series of wet string tests at various speeds and found little to no air flow over the supposed air intake louvers. We even made up a couple of "wings" trying to force the air down to the intake. 

Bottom line was that we moved the radiator to the front and cut an intake under the bumpers. 



Good luck! 



BobJ 

Frostbite Falls, MN 

CORSA since '72