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Dean,
I
do remember seeing an article in the last year or so in some car rag comapring
the two but I think more about horsepower loss, wasn't as much as electric fan
makers lead us to believe, but I don't ever remember seeing anything on the cfm
rating of clutch or mechanical fans. It would be interesting to have that
information though.
Dale McIntosh
TC Gold #92/ACES #1709
67SS/67 Elky
Dale’s Place
Team
67
Midwest Chevelles
Dale,
As always, you've got great information. Just
for the sake of comparison, is there any data on how many cfm's some of the
different GM mechanical fans give?
I've been thinking of going with electric fans for
some time because the ragtop can't idle for too long w/o getting hot & I'd
like to change that. I would need to go w/ dual fans to get away from
the water pump pulley. Running a BBC & a long water pump I
don't have a lot of clearance to spare.
Dean
Vandergriff
'65
ragtop
'65
hardtop
Bill,
I agree that
a single 16" Spal fan would probably be more than up to the cooling task
with the PRC radiator. The advantage to the single fan is the motor is
only 3.39" deep where the dual 11" are 4.25". Disadvantage is the
motor is in the center (in line with the water pump pulley) as opposed to
being offset from center. Another option would be to mount a pair of
10" fans individually. Each are 10.6" wide (21.2" total), 11.26" high
on the mounting hole centerlines, and the fan motor is 3.7" deep. A
single is rated at 1070cfm so that would still give 2140cfm total and would
give offset motors if clearance is a problem.
If anyone is
interested, I have Spal spec sheets for 9", 10", 11", 12", 13", 14", and 16"
fans in Adobe .PDF format and are downloadable from the Spal web site (http://www.spal-usa.com/). I'd be
happy to email offline to anyone who wants a particular size
or sizes.
File sizes
are:
9" =
84Kb
10" =
472kb
11" =
179Kb
12" =
213Kb
13" =
164Kb
14" =
232Kb
16" =
250kb
You haven't said
what climate you're in, but my guess is that the 2360 CFM 16"
Spal is more than enough, especially with a high performance
water pump. If not, you probably have another problem.
Enjoy,
Bill
Bruyn
Gilbert, AZ USA
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