Lotus Elan

Electric fan

PostPost by: AHM » Fri Jul 26, 2013 5:00 pm

Deleted - I thought about it and I was wrong!
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PostPost by: oldelanman » Sat Jul 27, 2013 8:12 am

oldelanman wrote:I wonder though if those who have cooling issues with the OE electric fan may have the blades the wrong way round.


Based on Keith's explanation above I think my blades may be on back-to-front. I took it apart to refurbish the motor and thought I'd put it back as it came off but maybe not.........can anyone confirm ?
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Cooling fan 002.jpg and
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PostPost by: MickG » Sat Jul 27, 2013 9:31 am

Looks to me as if its on the wrong way. The leading edge of the fan blades should face the direction of rotation. Either rotate the fan or reverse the connections to the motor.

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PostPost by: rjaxe » Sat Jul 27, 2013 9:33 am

I don't think you can have the blades the wrong way round, with the fan either way on the shaft the pitch of the blades will be the same. The fan rotational direction is the critical parameter and as shown if that is the radiator at the top of the picture it will push air into it.
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PostPost by: MickG » Sat Jul 27, 2013 9:44 am

Please ignore my previous post I think I'm wrong :oops:
I would use the trial and error method until it either blows or sucks depending on what you require.
Sorry for the misleading post.
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PostPost by: RogerFrench » Sat Jul 27, 2013 10:22 am

rjaxe wrote:I don't think you can have the blades the wrong way round, with the fan either way on the shaft the pitch of the blades will be the same. The fan rotational direction is the critical parameter and as shown if that is the radiator at the top of the picture it will push air into it.


That would be true only if the blades were symmetrical. If you look at Roger's photo, they aren't, and his are indeed bass-ackward.
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PostPost by: rjaxe » Sat Jul 27, 2013 2:17 pm

Quite right Roger, I assumed it was symmetrical having only glanced at it. I was more concerned that the flow was in the wrong direction and attempts were being made to correct that.
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PostPost by: oldelanman » Sat Jul 27, 2013 2:58 pm

Just to wrap this up......my fan was definitely fitted the wrong way round. On closer inspection the hub is actually marked to show direction of rotation and which side sucks ( :shock: ) and which blows.
Cooling fan 006.jpg and
SUCTION SIDE
Cooling fan 005.jpg and
BLOW SIDE ...... NEAREST RADIATOR
Cooling fan 008.jpg and


Thanks all for the advice.
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PostPost by: MickG » Sat Jul 27, 2013 7:24 pm

Thanks for the update Roger.

I wasn't wrong after all, makes a pleasant change :)

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PostPost by: oldelanman » Mon Aug 05, 2013 3:30 pm

A final word on the correct orientation of the OE electric fan blade........see my post above.

I just came across photos I took before I took the blade off to refurb the motor and it seems it was always fitted the wrong way round. I must have just refitted it the same way as it came off not realising it was wrong.

Fan motor rebuild 1.jpg and
FAN BLADE FITTED BACK-TO-FRONT (AS FOUND)



It could be that others were fitted incorrectly at the factory as well so if you are having cooling issues it would be worthwhile checking yours.
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PostPost by: john.p.clegg » Fri Aug 09, 2013 10:14 am

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