WIMPUS Posted March 12, 2013 Share Posted March 12, 2013 hi ! I'm want to know what the different's between regular water pumps (like on a early spit 1500) and Viscous ones (Late Spit 1500) What does a viscous one do ? And how they work ? :)I just wanted to know :PWim Quote Link to comment Share on other sites More sharing options...
Clive Posted March 12, 2013 Share Posted March 12, 2013 Viscous has a "clutch" mechanism built in, so the fan will never spin over a certain speed. The idea is that it saves energy (more power to the wheels)downside is they can size/break up. I have had a few, and always get rid of them. A normal pump is less complicated, so less to go wrong. Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted March 12, 2013 Author Share Posted March 12, 2013 cliftyhanger wrote:Viscous has a "clutch" mechanism built in, so the fan will never spin over a certain speed. The idea is that it saves energy (more power to the wheels)downside is they can size/break up. I have had a few, and always get rid of them. A normal pump is less complicated, so less to go wrong.mine's got a viscous pump, the viscous coupeling is maybe 3years old (still looks 'new') So the fan will spin at normal also .. but when it get's hotter it will spin faster ? right ? :) Quote Link to comment Share on other sites More sharing options...
69vitesse Posted March 12, 2013 Share Posted March 12, 2013 As the fluid gets hotter, the fan drives less efficiently, it slips, as the fluid gets thinner and slows down.In a nutshel, a nice idea in theory, in practice? Unreliable bit of expensive crap. Quote Link to comment Share on other sites More sharing options...
Clive Posted March 13, 2013 Share Posted March 13, 2013 I would use it until the first signs of issues. ie fan feels stiff or loose, leaks etcthn find a "normal" pump and fan. OR remove the viscous coupling and fit an electric fan, now or later. Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted March 13, 2013 Author Share Posted March 13, 2013 cliftyhanger wrote:I would use it until the first signs of issues. ie fan feels stiff or loose, leaks etcthn find a "normal" pump and fan. OR remove the viscous coupling and fit an electric fan, now or later.i know the viscous coupling had been changed 3 or 4 years ago ( car is been of the road now for nearly 2 years ) will see in the future , neighbour had also one with a viscous pump .. but he installed a fiat panda (or something ) fan on the rad, so i think the original fan is removed .. also he could have a different pump when i'm thinking of it .. he's engine is a 1300 (but a 1500 spit ) Quote Link to comment Share on other sites More sharing options...
JohnD Posted March 13, 2013 Share Posted March 13, 2013 Pedant Alert!Wonderful example of Grocer's Apostrophe in the thread titleWell done!John Quote Link to comment Share on other sites More sharing options...
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