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MG Midget and Sprite Technical - Electric cooling fan on a 1275

Hi guys
I have considered fitting an electric cooling fan.
What do you think of electric fans?
I think I can make one fairly cheap.
Where in the cooling system do I place the temperature transmitter? Or the question in another way: Moss has an electric fan kit, a Revotec, in that kit there's a controller and a transmitter in a short 12mm pipe.
Does any of you know where this piece of pipe has to be inserted, to make the whole arrangement work right?
Thx
Jan
Jan Kruber

.....fat fingers - it's NOT a 12mm pipe, it's a 25mm!
In which range should the controller work?
Open at 90 and close at 80 degr. C ? I think my temp. gauge say 88-90 degr. C when driving.
Jan Kruber

Hi Jan

There is quite a lot in the archives about electric fans.

If you find the archive button above, enter your search term on the next page, select 'this phrase' and search thread title only, you will get a lot of results. (see image below)

Dave


Dave O'Neill 2

Jan,

I think the Revotec mounting system is very well designed for the cross flow radiator models and I have fitted them on both my midgets.

The temperature sensor is usually fitted in the top hose as shown in the photo. I have set the sensor when the temperature guage is ~ 1/2 way between the N and the start of the hot section.


Doug Plumb

Thanks guys
Dough, I found this http://www.mattlewisracing.co.uk/product.php/833/42/electric_cooling_fan___matt_lewis_racing
Not even half the price of Revotec....
Oh, by the way, just how many ignition coils do you want ? :-)
Jan
Jan Kruber

Jan,
the Davies Craig fan doesn't seem to have a thermostat in the kit? If that's so it'll be up to you to keep an eye on the temperature and switch the fan on and off as required.
Jeremy MkIII

Jan,

The coil mounted on the dynamo is my spare for when travelling to Europe - postioned so easy to swap the connectors over in event of a fault. BMC used this coil postion for other installations [Mini, Minor etc] in the 60s.
Doug Plumb

Jan,
I've got a Revotec fitted and swapped up from the standard fan to a more powerful fan.

Whilst they're a good system you could do better. I found out too late that if I swapped the 1275 rad shroud to a 1500 rad shroud by altering it a bit I could have fitted an electric cooling fan behind the rad instead of having the Revotec (or any other make) in front of the rad.

I've removed the engine driven and not fitted an override switch as I see no sense in either if you have a thermoswitch controlled electric fan as the engine fan works when not required and goes slow when it should be going faster and an override switch is doing the work you bought the thermoswitch to do - though others disagree with my thoughts about these.

I find the Revotec switch can be set to come on when you want but the switching off is a bit later/lower temperature than I'd want. You don't want your fan switch and "water" thermostat settings too close to each other or they'll get into a cycle with each other.

Top hose is the popular position for fitting the thermoswitch, as Doug (and I).

I've no idea of how good the fan the linked to is but it is a multifit/direction rather than dedicated fit and direction.

For that electric fan, or others, I would say that a couple of their listed benefits aren't that valid, I doubt you'll notice much more mpg, there could be engine loss when the fan is running via the alternator (dynamo?), there could be less engine noise but there might be fan noise, there will be no more real engine space if the fan is behind the rad.

Having put all that if you have an engine driven fan and cooling system/heating that's in good condition and working well then an engine fan can be easily adequate subject to your engine and driving states.



Nigel Atkins

The 1500 rad with mounting will give a lot more clearance at the front .. about 3 inches (???)

There are 2 types of fans push and pull, I'm of the push fan... putting the fan on the front of the dlrad and pushing the air thru the rad

Make sure all air is forced thru the rad and not around the sides so all holes are sealed and covered

I'd also install a manual turn on switch for the fan just in case

I've noticed over the years there are vering. Ideas on where to place the sensor to tell the fan to turn on and off

If you have experisnce...then I'd build my own, as you can build a better system from a day at the salvage yard

If this is your 1st rodeo ... then Id use a pre-designed kit

Prop
1 Paper

One downside I've found with my fan in front of the rad installation is debris being held between the fan mounting brackets, more at bottom than top, and fan centre.

Photo below shows just a two year build up but to be fair it's never been as bad when I've had the rad out before and I do enjoy country roads. The debris is straw and insects.


Nigel Atkins

This thread was discussed between 15/11/2017 and 16/11/2017

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.