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  #1  
Old 21-03-2018, 08:30 PM
tassie wombat tassie wombat is offline
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Viscous Clutch fan

Gday all, is there a specific distance a viscous clutch hub should be from the radiator for the fan to work correctly (bi-metal spring)? Thanks in advance.
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  #2  
Old 21-03-2018, 10:28 PM
shaunv8 shaunv8 is offline
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IIRC any fan should be 2/3 inside the shroud, 1/3 out to work best, Solid or viscous....
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Old 22-03-2018, 05:32 AM
tassie wombat tassie wombat is offline
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That's pretty close to what I've got,but I've got a big distance from the face of the fan hub where the bi-metal spring is,to the core, I thought it may need to be closer ?
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Old 22-03-2018, 07:02 PM
Geoff 4 Geoff 4 is offline
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Don't think the distance is critical. Reason for saying that is some cars had the option of an in-line 6 or V8 engine. With the V8 engine being shorter, a very deep fan shroud was used with the V8 option, the fan clutch a long way from the rad core.

---------- Post added at 08:02 PM ---------- Previous post was at 07:58 PM ----------

Some of the currently available temperature activated fan clutches turn on at too high a temp for my liking. I modify the stop for the bi-metal spring so that the clutch turns 'on' at a lower temp.
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Old 22-03-2018, 08:52 PM
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Nev68 Nev68 is offline
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If you look at some of the larger US cars they had half a 44gallon drum for a shroud and the fan is about 2 feet from the radiator. As mentioned I think the shroud / fan positioning is most important.
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Old 22-03-2018, 09:29 PM
tassie wombat tassie wombat is offline
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Thanks for the replies everyone, hey Geoff how do you modify the hub so it locks up at a lower temp?? Do you tighten or lighten the spring?
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Old 23-03-2018, 07:02 PM
Geoff 4 Geoff 4 is offline
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You lighten the spring. I use the Hayden severe duty clutches. The anchor point needs to be moved CCW on those. There is enough metal on the alum boss to grind a new anchor slot. I use a small cut off wheel in a Dremel to do this.
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Old 23-03-2018, 07:45 PM
tassie wombat tassie wombat is offline
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Cool, thanks for that, would you have a part number for the Hayden clutch fan that your using? Ive just got a dayco one, that is normally run on early Holden up to mid 90's comodores p# 115049, not sure that this one can be modded?
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Old 26-03-2018, 06:51 PM
Geoff 4 Geoff 4 is offline
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Sorry, don't have a part #. I get them from Summit, prices here are outrageous for these.
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Old 26-03-2018, 08:39 PM
tassie wombat tassie wombat is offline
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Is this it?
https://www.summitracing.com/parts/hda-2797
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  #11  
Old 27-03-2018, 07:16 PM
Geoff 4 Geoff 4 is offline
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Yep, that's it. Modified two of those, running on cars.
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  #12  
Old 27-03-2018, 07:41 PM
tassie wombat tassie wombat is offline
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Thanks mate
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