[Fot] Electric Fan Location

[Bill Babcock]

It doesn't matter too much since the fan is only effective at low  
speed.  It's a very good idea to mount the fan behind the radiator,  
since installing it in front blocks airflow too much (as I found to my  
dismay). I wouldn't use the plastic "through the radiator" mounts  
since they can eventually cause a leak. the plastic can't abrade the  
metal, but dust that gets between the metal and the plastic can.

A lot of the triumphs that exclusively race have no fan, or a small  
fan to keep the temperature in bounds on the grid.

On Sep 12, 2008, at 6:18 PM, A Daniel Cronin wrote:

> 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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Bill Babcock
Babcock & Jenkins
Billb at bnj.com
503.936.7660
www.bnj.com

Editor
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