Best on temp for fanstat switch

Discussion in 'Mechanics Garage' started by thx1138, Dec 28, 2015.

  1. thx1138

    thx1138 New Member

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    I am after suggestions for the best fanstat switch "on" temp.
    Stock on the 84 VF1000R is 110c (230f)
    Thermostat opens at 82 c.

    110 c seems much too hot to me but where between the 82 of the thermostat and the current fanstat at 110c should I choose?
     
  2. OZ VFR

    OZ VFR Member

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    I did a fan overide switch that I use a lot if I'm in traffic.
    On hot days when I'm stopped at lights or in slow moving traffic, I switch it on around 90*C
    I feel that the standard one should come on around 98*C, but considering that there are thousands of our bikes out there with no modifications, I've never heard of it ever causing major failures.
     
  3. thx1138

    thx1138 New Member

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    The fanstat switch from another model with a part centre code " MR1" has an on temp of 100c.
    My 85 1000R had an aftermarket switch with an 85 on temp. That seems too low as its on/off temps cross over those of the thermostat.
    Maybe 95 on would be a good number?
     
  4. Terry Smith

    Terry Smith Member

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    Lots of more recent Honda's (CBR600F4, CBR954, 5th gen, 6th gen) use a switch at around 100C.

    I can't see any issue with having a switch closer to the thermostat opening temp, just that it would come on/stay on more often. Given the high temps usually coincide with idling through heavy traffic/stops I guess this could impact on battery charging if the fan was on too often.
     
  5. H3nry

    H3nry New Member

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    Has anyone tried an adjustable switch like Advance Auto Parts #226203? Under $20.

    I bought a replacement switch for the VFR from eBay, and it turned out to be 85 C. Too low for the main fan, but might work for the two 120mm computer fans I put on the right radiator. It seems poor design to let half the coolant return to the engine still hot when stuck in traffic with fan running. The computer fans are on a manual switch at present. They don't provide enough cooling by themselves, but they definitely help, and they don't draw anywhere near the current of the Honda fan. Cooling system experiments will resume next summer.
     
  6. squirrelman

    squirrelman Member

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    Can't go wrong with switch on at 100C.
     
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