43 replies to this topic

[nicklouse]

that fan is on the wrong way around.

[Readers14]

that fan is on the wrong way around.

That’s how the previous owner fitted it! Haha!

I purposely took a photo before I disassembled.

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[nicklouse]

so fit it the correct way.

[Readers14]

so fit it the correct way.

I bet when I do, I will need a spacer!

[DeadSquare]

It can happen to the best of them.

 

I think it was at a Silverstome Martini International.  Most of Timo Makinen's works Mini's practice was spent in the pit lane while waiting for the boiling engine to cool  before topping up the rad.

 

Its place in the paddock was almost next to us, and as the bonnet was lifted, we all crowded round for a glimpse.  As the steam cleared, I noticed that it had a new Special Tuning catalogue item, the two blade fan.

 

For the hell of it, in a deliberately annoying way, I commented to the silent viewers "Fan's going round the wrong way".

 

The silent derision was palpable, until Timo, like the little boy and the Emperor's clothes, said " E's right".

 

Somehow, someone had fitted a Morris minor fan blade.

Edited by DeadSquare, 29 November 2018 - 07:55 AM.

[cooperd70]

Cooperman/Nicklouse

This is mine (1990 998) I believe it to be as it was intended. Thoughts?

Edited by cooperd70, 04 December 2018 - 02:54 PM.

[nicklouse]

correct smooth side to the engine. it should even say so on it if original.

[cooperd70]

Thoughts on spacing of fan? Seems to stand quite proud of the cowl.

[cooperd70]

just the tips seem to be inside. looked a.little odd to me.

[nicklouse]

what spacer is on it? if just one 4mm it may be better with 2 of them. and does it have the correct top bracket fitted?

[Mini Manannán]

So what is the optimal minimum distance from the fan to the radiator? Mine is now 3/4", but the motor is pieced together from odd bits and I never knew what the original gap was. 

 

 

The distance between the rad and the fan is not so important.  Like Cooperman says, it is a ducted fan,the critical distance is between the fan and the duct (shroud) i.e. the gap round the circumference of the fan.

[Cooperman]

I once worked on the design of a wind tunnel which was 3 metres diameter with a 700 hp electric motir and a 6-blade fan.
The duct was a 6mm wall thickness steel tube and in order to get the best airflow the blade tip to duct wall design clearance was between 5 mm and 10 mm.
It was difficult to make as the tube was made from 4 pieces of flat plate each 3 metres long rolled and welded to be circular with the diametric tolerance applying where the fan was positioned.
It worked very well.

[cooperd70]

The fan to radiator fact dimension is unimportant.
As I said earlier, the key to optimum flow is having the mean blade position in the centre of the lip on the shroud. Moving the fan face towards the radiator whilst the blade tips are not fully in line with the shroud return lip will reduce air-flow and thus reduce cooling.
The Mk.1 2-piece shroud has the lip facing the opposite way from the later cars. Just make sure the fan blade tips are running within the width if this lip.

Cooperman,

I understand that the distance between the fan and rad is unimportant, but struggling to understand what you are saying here. Apologies if I'm coming across as an idiot :)

From what you are saying here and the pic of my fan/cowl relationship earlier this afternoon, would you say it looks correct for a later car?

Thanks again

cooperd (aka country bumpkin)

[nicklouse]

 

The fan to radiator fact dimension is unimportant.
As I said earlier, the key to optimum flow is having the mean blade position in the centre of the lip on the shroud. Moving the fan face towards the radiator whilst the blade tips are not fully in line with the shroud return lip will reduce air-flow and thus reduce cooling.
The Mk.1 2-piece shroud has the lip facing the opposite way from the later cars. Just make sure the fan blade tips are running within the width if this lip.

Cooperman,

I understand that the distance between the fan and rad is unimportant, but struggling to understand what you are saying here. Apologies if I'm coming across as an idiot :)

From what you are saying here and the pic of my fan/cowl relationship earlier this afternoon, would you say it looks correct for a later car?

Thanks again

cooperd (aka country bumpkin)

 

no it looks too far out. but again what spacer is on it and how many?

[Readers14]

Fan fitted correctly this time with 1x4mm spacer fitted:-

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