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RE: Shroud or not to shroud

To: "'Barrie Robinson'" <barrie@look.ca>, <mgb-v8@autox.team.net>, <mgs@autox.team.net>
Subject: RE: Shroud or not to shroud
From: "Daryl M. Naskale" <mgb@naskale.com>
Date: Fri, 5 Aug 2005 17:35:59 -0400
In-reply-to: <6.2.1.2.0.20050805120126.02f976d0@127.0.0.1>
Reply-to: "Daryl M. Naskale" <mgb@naskale.com>
Sender: owner-mgb-v8@autox.team.net
I have successfully gone shroudless before here in scorching Florida,
but you must have a powerful fan (or fans) of sufficient size, mounted
very securely and very close to the radiator to not allow too much air
to sneak around the end of the fan blades. I prefer it this way, because
not having a shroud cleans up the underhood area and makes service
easier.

Daryl

-----Original Message-----
Subject: Shroud or not to shroud


I have been told that I must shroud my electric puller fan to get 
engine/engine bay temp down but I am having trouble understanding the 
physics of this.  I know shrouding is always done on new cars so one
would 
suspect that they know what they are doing.

If one considers a fan stuck in front of a rad it seems reasonable to 
suppose it pulls air in through the rad in a profile almost exactly as
its 
fan blade coverage.   Thus the rad not covered by the fan just has air 
pushed over it by normal car motion.  In other words how can the
electric 
fan, humping away pulling air through the rad core directly in front of
it, 
effect the flow of the non-covered area?   What must happen is that the 
shroud forces air to be pulled through the non-fan blade covered areas
at a 
FASTER rate than if they were left alone.   This points to the need for
a 
sufficiently powerful electric fan.  So I suppose I should make a 
shroud.  Does anyone know how to make a shroud for a D&D Fabrications
heavy 
duty rad and a Perma-Cool 19114 14" fan?

Regards

Barrie Robinson
barrie@look.ca 

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