[Mgs] Mechanical cooling fan

Paul Hunt paul.hunt1 at blueyonder.co.uk
Wed Aug 15 03:47:53 MDT 2007


I'd be interested in some measurements on these.

What is the distance between the rear edge of the blades and the front of 
the dynamo/alternator spindle, and the distance between the front edge of 
the blades and the back of the radiator?  Please state blade type i.e. 
6-blade metal, 3-blade metal, 7-blade plastic (there were two of these, one 
without metal inserts in the blades and one with, don't know if they are 
separately identifiable) in each case.

For those with the earlier 3-bladed metal fan, is the concave (i.e. slightly 
cupped) face of the individual blades facing the engine or the radiator?

The 3-bladed metal on my UK 73 roadster seems to be the wrong way round 
(i.e. concave face forwards), but the other way round there is only a couple 
of mm clearance to the alternator and crank pulley and a massive 3" to the 
radiator.  The 'wrong' way round it is just under an inch to the alternator 
and crank pulley and a plenty big enough 1 3/4" to the radiator.  Any 
improvement in efficiency by having the blades facing the correct way must 
surely be lost by moving them that much further away from the radiator as it 
is unshrouded, let alone possible problems with proximity to the alternator 
and crank pulley.  I've changed the water pump on this car myself, and 
changed over its pulley, so I know those two pumps were the same dimension 
at least, and I have another pump the same.

I know first US cars then all cars had modified engine mounts and an engine 
restraint tube fitted to the gearbox, was this because of the 7-bladed fan 
being closer to the radiator and sometimes damaging it?  If so why were they 
(apparently) still fitted to 77 and later models with electric fan and 
forward-mounted radiator?

Thanks,
PaulH.

Thanks,
PaulH. 


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