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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Electric fan conversion..has anyone done one?Views : 1234 Replies : 24Users Viewing This Thread : |
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May 13th, 2019, 05:21 | #11 |
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stationary or moving, it takes power to drive a fan. If the fluid clutch on the viscous fan is buggered and its locked solid (typical viscous drive failure state), that power is being consumed all the time, moving or not, needed or not.
Electrics, not so much. Given the size and cooling efficiency of the average 2xx-7xx,9xx radiator, the fan should pretty much never be needed in normal operation ie not towing or hauling ass up a long incline. Perhaps around town on a hot summer day (what, two or three days a year in Blighty? ;-) ). A small electric would be easily enough if there is not air-con or heavy use to deal with. |
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May 13th, 2019, 07:41 | #12 | ||
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Quote:
Quote:
Last edited by tofufi; May 13th, 2019 at 07:43. |
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May 13th, 2019, 09:32 | #13 | |
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Get the right size and when it's fitted, won't actually look that much different from a factory fit jobby. Also bear in mind the original fan shroud was designed for use with the vicious fan to maximise air flow from the fan and is in fact restrictive to air flow without the fan. As for getting 2 speeds off one motor, it's easy enough but you need a two-element switch (if memory serves, Vauxhall Omega fan switches are useful for this), a second relay and a 10A bridge rectifier to get the lower speed. When the first element of the switch is made, it switches relay #1 in sending +ve power to the fan via the -ve terminal of the bridge rectifier and out the +ve terminal to the fan. When the second element is made (higher temperature), the second relay is operated and the contacts of this realy simply link the -ve and +ve terminals of the bridge rectifier, effectively shorting it out so full power is delivered to the fan. Going through the bridge rectifier will drop the supply voltage to the fan by about 1.8V which is enough to reduce the fans power by considerably more than the expected drop from losing 1.8V - it's something in the region of 20-30% less power from memory, i did the maths quite some time ago and can't remember the figure off the top of my head.
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May 13th, 2019, 10:24 | #14 | |
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May 13th, 2019, 10:36 | #15 |
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I know one of us did and i think it was you. It's since been used and proven at least twice to my knowledge.
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May 13th, 2019, 16:57 | #16 |
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My experience with a Morris 1100 was a 10% fuel saving by fitting a Kenlow fan. I have seen similar figures quoted for electric fan conversions upstairs in the 240 section.
Kenlow claimed that savings came mainly because engines could be run at a higher more efficient temperature. But. If I convert the 240 to electric fan my wife will no longer hear and instinctively know if my 240 is started up outside. An essential part of theft prevention. . |
May 14th, 2019, 06:57 | #17 |
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May 14th, 2019, 07:44 | #18 | |
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That's not a shroud - THIS is a shroud! Good point, well made Jim! That shroud will also improve flow through the electric fan whether it's powered or not, compared to the shroud for the vicious fan.
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May 14th, 2019, 07:49 | #19 |
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The shroud does improve fan efficiency. It does this by ducting the air so that turbulence at the blade tip doesn't reverse air flow. The ring that most after-market fans have connecting the fan blade tips does the same thing albeit highly localised. Since we are doing quotes, Its a shroud Jim, but not as we know it.
In any case, electric beats viscous AND vicious imho. Last edited by aardvarkash10; May 14th, 2019 at 07:50. Reason: Star TRek reference |
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May 14th, 2019, 07:50 | #20 |
Pain in the backside
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That fan looks familiar...
You still not fitted it yet? |
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