Photo Tachometer.

[martin]

Hi all, some kind soul started a short thread about the above, but sadly I can't find it.
I've bought one off Ebay and blow me down, it works ! At long last I've been able to establish that my viscous coupling is faulty, not too chuffed about having to buy another, but now I know. A big thank you to said kind soul. Martin.

[Stagdad]

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Martin

Just had a look for these as I didn't know what they were,found some on ebay but how do they work on the fan unless it knows how many blades it has?

Cheers Steve

[martin]

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The device comes with some reflective tape, cut off half an inch and stick it to one blade,it has a laser target light, point at the tape and it counts the revs, I checked it against a multimeter tach and it's quite accurate. Martin.

[Stagdad]

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Ah I see ,Would be good for quick comparisons between stags to see if a VC is failing,might have to have a word with Santa.


What were your readings for your VC as mine seems to slip freelywhen hot but only spins 2 blades when cold which seems the wrong way around to me.

Got a new VC ready on the shelf thanks to Bob H


Cheers Steve

[martin]

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Stagdad wrote:
[quote]Ah I see ,Would be good for quick comparisons between stags to see if a VC is failing,might have to have a word with Santa.


What were your readings for your VC as mine seems to slip freely when hot but only spins 2 blades when cold which seems the wrong way around to me.

Got a new VC ready on the shelf thanks to Bob H


Cheers Steve


Hiya, I'm afraid I didn't make accurate notes, but hot, at 2000 RPM the fan was reading about 850. Martin.

[DJT]

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Stagdad wrote:

Ah I see ,Would be good for quick comparisons between stags to see if a VC is failing,might have to have a word with Santa.


What were your readings for your VC as mine seems to slip freelywhen hot but only spins 2 blades when cold which seems the wrong way around to me.

Got a new VC ready on the shelf thanks to Bob H


Cheers Steve

Hi Steve,

The VC is supposed to follow engine revs until somewhere below around 3000rpm, where it will go no faster no matter what the engine does. I think 2850rpm comes to mind. The fluid inside shears at this speed.

Dave

[Stagdad]

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DJT wrote:

Stagdad wrote:

Ah I see ,Would be good for quick comparisons between stags to see if a VC is failing,might have to have a word with Santa.


What were your readings for your VC as mine seems to slip freelywhen hot but only spins 2 blades when cold which seems the wrong way around to me.

Got a new VC ready on the shelf thanks to Bob H


Cheers Steve

Hi Steve,

The VC is supposed to follow engine revs until somewhere below around 3000rpm, where it will go no faster no matter what the engine does. I think 2850rpm comes to mind. The fluid inside shears at this speed.

Dave

Thanks Dave /Martin,mine must be on it's way out I think as when hot it spins freely,Still don't overheat though.

Cheers Steve

[StagnJag]

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Can anyone find the original topic on this subject? I would like to include it in the next Forum writeup in the mag.

Cheers

Dave

[Arbman Al]

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StagnJag wrote:

Can anyone find the original topic on this subject? I would like to include it in the next Forum writeup in the mag.

Cheers

Dave

Hi Dave,

Is it this one?

http://stagownersclub.mywowbb.com/view_topic.php?id=10862&forum_id=1&highlight=Viscous

Al.

[StagnJag]

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Arbman Al wrote:

StagnJag wrote:

Can anyone find the original topic on this subject? I would like to include it in the next Forum writeup in the mag.

Cheers

Dave

Hi Dave,

Is it this one?

http://stagownersclub.mywowbb.com/vi...hlight=Viscous

Al.

Taht's the kiddie! Thanks Al.