northernbrowns Posted April 22, 2022 Report Share Posted April 22, 2022 Hi My Spitfire has been fitted with an electric water cooling fan but is activated only with a manual on/off switch. Is there a kit to change the mechanical thermostat to a sensor to auto start/ stop the fan? Thanks Mike Link to comment Share on other sites More sharing options...
johny Posted April 22, 2022 Report Share Posted April 22, 2022 Bit confused here as you say manual switch and then mention mechanical thermostat which if working correctly should turn the fan on and off automatically depending on temperature... Link to comment Share on other sites More sharing options...
NonMember Posted April 22, 2022 Report Share Posted April 22, 2022 It's perfectly possible to control an electric fan with anything from a manual switch, through thermostatic switch up to absurdly OTT microcontroller doing variable speed by PWM (which is what my Mk3 Spitfire has). There are kits for some of these options. Link to comment Share on other sites More sharing options...
Peter Truman Posted April 22, 2022 Report Share Posted April 22, 2022 I brought a kit locally here in Aus consisting of the temp sensor switch (82C), relay,a make break thermal switch & wiring plus Pete’s hated scotch lock for $24 here delivered its fitted to the daughters Mk2 Spit with a manual over ride switch in parallel works a treat! I subsequently brought 2ea spare temp switch’s 79c and 84C just in case they were not good quality but pulling one to pieces I’m totally happy with their construction. So the conversion is relatively cheap. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 22, 2022 Report Share Posted April 22, 2022 2 hours ago, Peter Truman said: Pete’s hated scotch lock might have known i would get dragged in some how Ha !! kits available from most eg Electronic Inline Fan Controller With Relay For 32mm ID Hose | Car Builder - Kit & Classic Car Parts Specialist Pete Link to comment Share on other sites More sharing options...
northernbrowns Posted April 22, 2022 Author Report Share Posted April 22, 2022 4 hours ago, johny said: Bit confused here as you say manual switch and then mention mechanical thermostat which if working correctly should turn the fan on and off automatically depending on temperature... Im referring to the original mechanical thermostat installed within the cooling circuit. The electrical fan that has been installed has no automatic way of starting Link to comment Share on other sites More sharing options...
northernbrowns Posted April 22, 2022 Author Report Share Posted April 22, 2022 32 minutes ago, Pete Lewis said: might have known i would get dragged in some how Ha !! kits available from most eg Electronic Inline Fan Controller With Relay For 32mm ID Hose | Car Builder - Kit & Classic Car Parts Specialist Pete thanks, this is what IM looking for, Mike Link to comment Share on other sites More sharing options...
johny Posted April 22, 2022 Report Share Posted April 22, 2022 44 minutes ago, northernbrowns said: Im referring to the original mechanical thermostat installed within the cooling circuit. The electrical fan that has been installed has no automatic way of starting Ah ok because here, at £13.61 incl del., is a suitable adjustable mechanical thermostat switch kit to automatically control a radiator cooling fan: https://www.ebay.co.uk/itm/191447689025?hash=item2c932be741:g:JaMAAOSw4DJYgiQB Link to comment Share on other sites More sharing options...
NonMember Posted April 22, 2022 Report Share Posted April 22, 2022 30 minutes ago, johny said: a suitable adjustable mechanical thermostat switch kit That looks like a clone of the Kenlowe unit. Some people find them to be horrid things that cause leaks and nothing but grief. Other people seem to be fine with them. Link to comment Share on other sites More sharing options...
johny Posted April 22, 2022 Report Share Posted April 22, 2022 Blimey so simple I cant see how you can get it wrong! Link to comment Share on other sites More sharing options...
Iain T Posted April 22, 2022 Report Share Posted April 22, 2022 2 hours ago, northernbrowns said: thanks, this is what IM looking for, Or have a chat with T7 Designs. I've bought my fan, controller etc from them. Very helpful. Iain Link to comment Share on other sites More sharing options...
cliff.b Posted April 22, 2022 Report Share Posted April 22, 2022 1 hour ago, johny said: Ah ok because here, at £13.61 incl del., is a suitable adjustable mechanical thermostat switch kit to automatically control a radiator cooling fan: https://www.ebay.co.uk/itm/191447689025?hash=item2c932be741:g:JaMAAOSw4DJYgiQB I have fitted one of these with the control knob within reach under the dash and the sensor in the rad return hose. No leaks. I have gone back to a manual fan though and just set this for backup. It only tends to come on now if weather is hot and I stop in traffic or after enthusiastic driving. Link to comment Share on other sites More sharing options...
rogerguzzi Posted April 22, 2022 Report Share Posted April 22, 2022 Hello Mike I use this type but it dose need a boos soldering in the radiator mine is at the bottom on a Spitfire and works a treat but I have 2 small fans so can switch one on first and the second comes on if it gets very hot(not very often!) T7Design | M22 x 1.5 Radiator Fan Switch Dual Stage 87-79, 88-83c Roger Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 22, 2022 Report Share Posted April 22, 2022 whats wrong with the engine fan far less problems than the must haves triumph did far more cooling trials to get a good all round air flow but then we all now how to twiddle and often go off the rails Pete Link to comment Share on other sites More sharing options...
DanMi Posted April 22, 2022 Report Share Posted April 22, 2022 why not just go back to the simple tried and tested (by the engineers at Triumph) mechanical fan. I have never in all the 35 years of spitfire ownership had an issue with the standard setup. Is an electric fan simply a must have that simply isn't needed. Oh well Pete beat me to the same comment Link to comment Share on other sites More sharing options...
johny Posted April 22, 2022 Report Share Posted April 22, 2022 You certainly cant get simpler and less prone to failures than a direct drive mechanical fan. Definitely turns on and off automatically😂 Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 22, 2022 Report Share Posted April 22, 2022 and to add it also maintains a good under bonnet air flow when stuck in traffic Pete Link to comment Share on other sites More sharing options...
Adrian Cooper Posted April 22, 2022 Report Share Posted April 22, 2022 Is there any other topic that divides the forum 'Big Beasts' like the fitting of electric fans? Just for the record, I have an electric fan on my Spitfire and it has been faultless for over 20 years. (Triumph Acclaim thermostatic switch tapped into the thermostat housing) Quieter, engine warms up faster, rock solid temperature in traffic. Alternator conversion a must though. Adrian Link to comment Share on other sites More sharing options...
Colin Lindsay Posted April 22, 2022 Report Share Posted April 22, 2022 4 minutes ago, Adrian Cooper said: Is there any other topic that divides the forum 'Big Beasts' like the fitting of electric fans? Like all things it comes down to personal preference. Do we need it? Or do we want it? If it doesn't make the car any better at least it makes the owner feel better... Link to comment Share on other sites More sharing options...
Chris A Posted April 22, 2022 Report Share Posted April 22, 2022 8 minutes ago, Adrian Cooper said: engine warms up faster Maybe a daft question, but why would it warm up faster? Whatever type of fan is used the thermostat will stay closed until the water is hot therefore not passing by the radiator. Is it because an engine driven fan will be pushing air over the engine and cooling it even when the water is cool? I could be persuaded that an electric fan moves a greater volume of air when it is turning therefore reducing water temperature quicker. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted April 22, 2022 Report Share Posted April 22, 2022 1 minute ago, Chris A said: Maybe a daft question, but why would it warm up faster? Whatever type of fan is used the thermostat will stay closed until the water is hot therefore not passing by the radiator. Is it because an engine driven fan will be pushing air over the engine and cooling it even when the water is cool? I could be persuaded that an electric fan moves a greater volume of air when it is turning therefore reducing water temperature quicker. I can guess (but can I describe what I mean in a way that makes sense?): the mechanical fan will be working all the time so when the thermostat opens, the warm water coming into the radiator will be cooled from the start, whether it needs it or no, and will take longer to reach full heat throughout the entire system. With the electric fan, the water entering the radiator will be warm, but not hot enough to start off the electric fan until it gets that bit warmer overall. So: the cooling will start that bit later and the engine warms up more quickly. Does that sound right? Link to comment Share on other sites More sharing options...
Chris A Posted April 22, 2022 Report Share Posted April 22, 2022 4 minutes ago, Colin Lindsay said: I can guess (but can I describe what I mean in a way that makes sense?): the mechanical fan will be working all the time so when the thermostat opens, the warm water coming into the radiator will be cooled from the start, whether it needs it or no, and will take longer to reach full heat throughout the entire system. With the electric fan, the water entering the radiator will be warm, but not hot enough to start off the electric fan until it gets that bit warmer overall. So: the cooling will start that bit later and the engine warms up more quickly. Does that sound right? There could be some logic in that, but I would have thought the effect minimal. I'll stick with the mechanical fan and a well maintained cooling system, including a heater that works and can be used as an auxiliary cooling fan 😁 Link to comment Share on other sites More sharing options...
NonMember Posted April 22, 2022 Report Share Posted April 22, 2022 34 minutes ago, Chris A said: There could be some logic in that, but I would have thought the effect minimal. Not minimal at all. The thermostat opens below 80C but the engine isn't really "fully warm" until nearer 95C. Heating up from cold to 80C is quick because the stat is closed, the next 15C takes a lot longer as cold water gets introduced. Having the fan running during this time prolongs that cold water period really quite a lot. 57 minutes ago, Colin Lindsay said: Like all things it comes down to personal preference. Would that be why two of mine have electric fans but the one with most reputation for overheating still has the mechanical one? No, it's because that's how they came to me. So my "personal preference" is laziness. Link to comment Share on other sites More sharing options...
DanMi Posted April 22, 2022 Report Share Posted April 22, 2022 if the car is moving the effect of the forward motion is greater than the fan. So the fan really only gives greater cooling if the car is stationary, and why bother starting the car if you are not going to go anywhere? (or at least similar) 1 Link to comment Share on other sites More sharing options...
cliff.b Posted April 22, 2022 Report Share Posted April 22, 2022 On this subject, I have been thinking that as a standard fan is said to consumes maybe a couple of HP of engine power (about 1500watts), how can electric fans of maybe 120 to 250 watts shift anywhere near as much air? I'm guessing that is probably only at max revs though. Possibly at tickover the mechanical fan may shift less air than an electric fan. As I currently have both fitted I plan to carry out some further investigation if we have any hot weather like we did last year. When it hit the high 30s I put the mechanical fan back on and it did run cooler, never venturing above halfway on the gauge when it had previously registered between 1/2 & 3/4. Link to comment Share on other sites More sharing options...
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