GT64fun Posted December 21, 2011 Share Posted December 21, 2011 Hi Folks - my first new thread so be gentle.I'm considering removing the engine driven fan from my GT6 and replace it with an electric suction fan. This to give better engine response generally and better cooling in traffic when the engine is just turning the fan at idle speed. I just removed the engine fan one winter in the distant past (when I was young and foolish) and liked the result, although it got a bit scary in traffic). I have identified a 12" SPAL suction fan VA10-AP10/61A, that shifts 1750cuft/min and is a close fit onto the GT6 rad. See attched PDF. This unit is slimline at only 55mm deep and I will replace the existing fan boss with a thinner spacer. Hopefully there is just sufficient clearance on the waterpump.To control the fan there seem to be a number of options and I would welcome your advice here. There are aftermarket options eg Revotech, with either a 'bulb' sensor inserted into the top hose (don't like), an M22x1.5 threaded sensor into a boss fitted into the header tank, or the sensor into an inline insert fitted into the top hose, which doesnt look feasible for the GT6 crinkly bellowed top hose. Any of these presumably would give the opportunity to set the start up temperature via the 'control knob'. SPAL even do a sensor/variable speed controller, but that is more expensive than the fan !!A lot of modern cars seem to use a fan sensor switch, premade to operate at a specific temperture, eg on at 93 off at 90 deg C. Switches seem readily available and reasonbly priced. Does anyone have experinece of using any of these options. All comments welcome and a Merry Christmas to you all !!Ian F ;) Link to comment Share on other sites More sharing options...
Tim Bancroft Posted December 21, 2011 Share Posted December 21, 2011 I'd fit a sensor/fan switch and boss into the either the top or bottom tank on the rad to control the fan.To get around the issue of the GT6 crank pulley being too wide, use a mk2 Vitesse item.I have this set up with a Pacet electric fan (Sucker) on my GT6, it works! Link to comment Share on other sites More sharing options...
GT64fun Posted December 21, 2011 Author Share Posted December 21, 2011 Hi TimThanks for the response.Did you use a standard OE fan control sensor, if so which one (or what temprature range).Ian F ;) Link to comment Share on other sites More sharing options...
Nick Moore Posted December 21, 2011 Share Posted December 21, 2011 Hi Ian,I'd use a 22mm thread switch in the top or bottom tank. I use an 85-on, 75-off switch in my Herald. I found that it doesn't like to run as warm as modern engines, and at 90C plus is very unhappy. From what I've seen, GT6s run a few degrees warmer than my Herald, but when my GT6 is finished I'll try an 85-75 switch in it as well. Link to comment Share on other sites More sharing options...
cook1e Posted December 22, 2011 Share Posted December 22, 2011 I've fitted my temperature switch in the top hose but it's a tight squeeze and you have to do away with the bellows type hose. I used a billet alloy switch mount purchased on ebay designed for top hose fitting.I use a pacet fan sucking through from behind the rad. Link to comment Share on other sites More sharing options...
GT64fun Posted December 22, 2011 Author Share Posted December 22, 2011 Hi Nick & Cook1eThanks for the responses.Nick:-do you recall what sensor (or from what vehicle) you used ?Cook1e:- looks a tight fit on the top hose, but the result is very compact and you have kept the wiring close to the fan. Do we know why Truimph used the crinkly hose? Did you have any issues with clearance on the water pump boss?RegardsIan F ;) Link to comment Share on other sites More sharing options...
MickW Posted December 22, 2011 Share Posted December 22, 2011 I have an 82C switch which is mounted in the bottom tank. I got the switch from Cambridge Motor Sport and just took it together with the radiator to the local radiator specialist and they fitted an appropriate boss. No overheating with the temperature sitting in the middle of the dial and no apparent excessive fan use.Mick Link to comment Share on other sites More sharing options...
cook1e Posted December 22, 2011 Share Posted December 22, 2011 2726 wrote:Hi Nick & Cook1eThanks for the responses.Nick:-do you recall what sensor (or from what vehicle) you used ?Cook1e:- looks a tight fit on the top hose, but the result is very compact and you have kept the wiring close to the fan. Do we know why Truimph used the crinkly hose? Did you have any issues with clearance on the water pump boss?RegardsIan F ;)The crinkly hose allows a bit of movement of the engine on it's mounts. years ago I did have a crack appear on a radiator where the top hose spout joins so I guess the crinkly hose is to relieve stress. I had no issues with clearance, the Pacet fan is fairly thin, also due to it being fully shrouded you can afford to keep the cabling close, with Kenlowe type open fans you'd have to be more careful. Link to comment Share on other sites More sharing options...
GT64fun Posted December 23, 2011 Author Share Posted December 23, 2011 Thanks for all the replies.A new year project I think!!RegardsIan F ;) Link to comment Share on other sites More sharing options...
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