Richard,
FYI, all the water pumps (though contstructed slightly differently) wind up
with the same net clearance to the radiator as far as I was able to determine
through my research a few months ago. The only possible solution would be to
get a very late model (79-80 I believe) water pump housing and cut off that
inch or so of rod that sticks out in the front (as illustrated in Mr. Chu's
photos) to provide slightly more clearance for the fan. I don't know if
trimming down the metal on the pump in this way would have any adverse
consequences or not.
Jeff
----- Original Message -----
From: Richard Gosling
To: 'Piter Bsna' ; Dave Chu ; spitfires@autox.team.net ; Jeff McNeal
Sent: Monday, December 30, 2002 3:24 AM
Subject: RE: rimmers parts
Peter,
I have a feeling (partly derived from reading of Jeff's attempts to fit his
electric fan) that the principle problem is the water pump, but I believe
that some 1500 owners have fitted pullers successfully (not just those late
US models with the angled radiators), so maybe a change of water pump for a
later model might help?
Failing that, fitting the wider radiator allowing a greater offset, as Dave
has done, seems a good solution. I would add that the fan is more
efficient
if the area not covered by the fan has a shroud, to make sure that the air
pulled by the fan is through the radiator and not from around the edges.
My
wife's Audi has a smart design where the shround consists of a grid with
pieces of rubber attached at their top edge only, so that when the car is
moving at speed the rubber flaps up out of the way allowing air to pass
through the full radiator, but when the car is stationary the flaps fall
back down and prevent air being sucked back through them.
If you really can't get it in, then the fan should work as a pusher well
enough to allow you to get rid of the fan on the water pump. In fact I've
heard say that having two fans is more of an obstruction than having just
one. The electric motor is an obstruction whether the fan is a pusher or a
puller. I've heard enough hearsay that a puller is better as a pusher to
believe it, although I'm not entirely sure why.
Finally, why are you so sure that you "absolutely need some additional
cooling"? Unless you spend a lot of time in stop-start traffic, or live
somewhere VERY hot (sorry, I forgot where you come from), a properly set-up
Spitfire should not overheat. If it is overheating, you have another
problem. Fitting an electric fan is a patch, not a fix, for an overheating
problem.
Richard & Daffy
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