[Fot] Electric Fan Location

[Jack Brooks]

Daniel,
 
I have a 1,150 CFM fan behind my radiator and it's located near the top of
the radiator.  I chose that position because the temperature gradient is
greater at the top, due to the hot water entering from the top.  With a
greater temperature differential, more heat is shed from the radiator with
every CFM that passes through the radiator.
 
Mounting - I brazed studs to the outside of the radiator.  I also brazed a
coupling on the front of the radiator, just above the top of the core, for a
modern OEM style fan speed switch to control the fan.  I put it on the front
of the radiator, so it would not be seen.  It's easy to change it through
the grill opening.
 
Jack
1960 TR3A

  _____  

From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of A Daniel Cronin
Sent: Friday, September 12, 2008 6:19 PM
To: Friends of Triumph; Triumph List
Subject: [Fot] Electric Fan Location


Listers:
Am rebuilding a 55 TR2 and will be installing a Flex a Lite 1050 cfm, 9 amp
load, 10 blade, 12" diam. electric fan with variable speed control kit and
manual on/off switch on an aluminum radiator without crank hole.  Radiator
effective area is 11 1/2" wide x 18" high x 2 1/2" deep.  Stock Tr2-3b
radiators were about 17" x12" x3" and the crank hole was up from the bottom
of the fins about 6 1/2" and the stock fan appears to span the entire width
of the stock radiator, some 13" diameter, so it is pulling air into the
bottom 2/3's of the radiator.  The grill opening on the 2 starts just under
the crank hole and has an opening at the radiator face of about 11" high and
averages 13" in width.  It appears as if the fan is pulling half its air
from under the front apron lower skirt (the 6 1/2" below the crank hole) and
the other half from the lower portion of the grill opening.  It then seems
that the "ram" effect of air being forced thru the upper 70% of the radiator
when under way completes the cooling tasks.
 
Given that the fan I will be using is slim enough to be positioned at any
height behind the radiator (puller) without interference from the cross
brace connecting the spring towers, where would you think would be the most
desirable location to install the fan.
 
Planning & Development Services
A. Daniel Cronin
248 761-2673 
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