I looked at the idea of switching to a mechanical fan
last year when I had my radiator re-cored. I don't
think there is enough room to install a big fan
because the steering rack is in the way. You would
need a 16" or bigger fan. On my car, a 74 there just
isn't enough room for more than maybe a 10" fan. I had
a five tube 15 fins/inch core installed as recommended
and would not take the same route again. The radiator
helped a little, but not enough and we didn't have our
usual hot summer here in NC last year. I would get a
custom built aluminum radiator if doing it again. I
found a Bosch 2 speed fan at Carlisle last year, it
has six blades and moves more air than a 4 blade, also
draws 3-4 amps more current. It fits on the right
side, very close to the alternator belt and will not
fit the left side because the power steering pump is
in the way. You may want to check Howard Stewat
Components on cooling system information
at http://www.stewartcomponents.com/, they have a very
informative question and answer section. They provide
water pumps to most Winston Cup race teams. I realize
I didn't answer your questions, I also would be
willing to go the mechanical fan route if I could find
room to install one big enough to do the job.
Clifton Gordon
Interceptor III 22101156
North Carolina, USA
--- [EMAIL PROTECTED] wrote:
> Bob from Northeast:
>
> I remember seeing the Interceptor fan upgrade
> article in AJO, but I did it
> some years ago. I have done it and it was easy.
> First, obtain a set of the
> Bosch fans from a VW salvage yard, say from an older
> Rabbit, Scirocco, or
> equivalent. Cost was about $25 each back then. Buy
> three to have a spare,
> though you will not likely need it. Have them spin
> them up off a 12 volt
> battery if possible while you are there just to
> confirm they work and are not
> tired. Bring your lucas fans for a size match.
>
> The Bosch fan blade itself is also reusable and fits
> in the opening. The
> fans are white, not yellow and have a better pitch.
> You may be able to buy
> the fans new, but it really is not necessary as
> millions were made and they
> are reliable. As I recall, there are some mounting
> tangs that you do not
> need, I ground them off but I think you can leave
> them on and use your
> existing brackets. I reused most of my old wiring
> but I did add separate
> relays for each fan as they draw much more amperage
> than the stock fans.
> Of course someone like Doug Myers can probably
> provide the kit along with a
> suggested wiring diagram.
>
> Having said all this, I took advantage of a little
> spare time today to remove
> my upgraded fan assembly from my 1972 car. I am
> going to see if I can find a
> mechanical fan and shroud from an old American car.
> I know that if I have a
> good radiator and if my timing, electrics, and mix
> are right, I should have
> no problem with the Bosch-upgraded unit. They do
> move a ton of hot air.
> But I always seem to have problems with the cooling
> and pinging at the most
> inopportune times and I go through a battery a year.
> I decided to "go for
> it" and rebuild the radiator, install a mechanical
> radiator fan, and upgrade
> the A/C blower fan. I will save the electric fans
> and shroud just in case,
> but my desire for a cool running and reliable car
> has overcome my desire for
> originality. My goal: A/C that works even when it
> is hot and I am sitting
> in Bay area traffic !
>
> I have a couple of questions for anyone savvy about
> my proposed changes.
>
> 1. Any suggestions for a donor mechanical fan and
> shroud ? Early-seventies
> New Yorker ? Diameter ? Thermal clutch ?
>
> 2. Anyone have a recommendation for a radiator
> rebuild source or approach ?
> Does Doug Myer offer a rebuild service ? Did you
> retain the tranny oil
> reservoir or bypass it during your rebuild ? Did
> you salvage any part of the
> old radiator ? Any specific type of new radiator
> (3-row, 4, or 5 ?)
>
> Thanks,
>
> Dan C.
> San Jose, CA
>
>
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