Dolomitejohn Posted February 22, 2019 Report Share Posted February 22, 2019 Hi everyone. Whilst my gt6 mk3 is in bits I am wondering on which is the best mechanical fan for shifting air. I know the spitfires in usa had a viscous unit and fan and that dolomite sprints and some 2000 2500 have them. But what about gt6? I quite like the viscous fans. I think they sound quite cool ( no pun intended) but are also smoother and more efficient than a fixed to crank pulley job. Thoughts? Cheers all. John Link to comment Share on other sites More sharing options...
Colin Lindsay Posted February 22, 2019 Report Share Posted February 22, 2019 If you like them, go for it. I've had them on Landrovers and now on the TR7 and never had any trouble from them. I changed my early GT6 from the six-blade metal fan to a plastic late GT6 version which i reckon is a good improvement, but never felt the need for anything else ie electric. Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 22, 2019 Report Share Posted February 22, 2019 The plastic is much quieter than the old metal fans and doesnt need balancing Is there room tomfit a viscous drive on a gt6 ??? Guess you need z a 2000 front pulley and spigot Pete Link to comment Share on other sites More sharing options...
dave.vitesse Posted February 22, 2019 Report Share Posted February 22, 2019 On a GT6 I tried the early and late GT6 plastic types plus the later 2000 saloon blue type, there was no difference in the cooling. Disappointing. "Like what Pete said" no sure if there is room for the viscous type. You would have to have a look at a 2000/2500 saloon. Dave Link to comment Share on other sites More sharing options...
Clive Posted February 23, 2019 Report Share Posted February 23, 2019 I know what you mean bout efficient, they have a "max speed" so don't sap as much power. But in all honesty I don't think the extra costs are worth the benefit. the plastic fixed fan works well and I doubt you would notice the noise difference. Economy difference would be too tiny to measure. Link to comment Share on other sites More sharing options...
johny Posted February 23, 2019 Report Share Posted February 23, 2019 This might be the best mechanical fan you could fit and it looks like it should bolt straight on..... https://www.ebay.co.uk/itm/Triumph-TR6-Red-13-Bladecooling-Fan-With-Adapter-Hub/303073231483?hash=item469092827b:g:aZQAAOSwCiRccZHY Link to comment Share on other sites More sharing options...
Colin Lindsay Posted February 28, 2019 Report Share Posted February 28, 2019 Anyone ever tried the Aerofan with the spring-loaded blades? I've got one, but never used it... sounds good in theory though. Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 28, 2019 Report Share Posted February 28, 2019 There is one of those in your clubs museum Just one of the 60s bright ideas Pete Link to comment Share on other sites More sharing options...
johny Posted February 28, 2019 Report Share Posted February 28, 2019 The idea is still alive and well and, it seems, pretty popular across the pond: https://www.ebay.co.uk/itm/Derale-Hi-Stainless-Steel-Flex-Fan-Counterclockwise-Rotation-13-Dia-19313/392249923219?epid=187953815&hash=item5b53ead693:g:0CkAAOSw8KRcd7Du:rk:7:pf:0 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted March 1, 2019 Report Share Posted March 1, 2019 13 hours ago, johny said: The idea is still alive and well and, it seems, pretty popular across the pond: https://www.ebay.co.uk/itm/Derale-Hi-Stainless-Steel-Flex-Fan-Counterclockwise-Rotation-13-Dia-19313/392249923219?epid=187953815&hash=item5b53ead693:g:0CkAAOSw8KRcd7Du:rk:7:pf:0 Mon Joo!! I thought I had the only one of those, and it was a one-off.... definitely not safe for fingers. Link to comment Share on other sites More sharing options...
Gary Flinn Posted March 1, 2019 Report Share Posted March 1, 2019 Flex-a-Lite fans are very popular with Sunbeam Tiger owners and are supposed to work well? With the amount of heat produced in a Tiger Engine bay you need all the help you can get🤔! Link to comment Share on other sites More sharing options...
johny Posted March 1, 2019 Report Share Posted March 1, 2019 As I understand it theyre no better than any other mechanical fans in terms of air moved but as the engine revs higher the force on the blades from moving air increases and tends to flatten them out so they move less air and consume less engine power. Effectively they move more air when rotating slowly which, as in a traffic jam, is when the engine needs more cooling cos theres less cooling effect from the movement of the vehicle. However Ive never seen any test results showing the power or fuel saving...... Link to comment Share on other sites More sharing options...
Colin Lindsay Posted March 2, 2019 Report Share Posted March 2, 2019 Sort of an early version of the viscous then, moves more air when needed and then when at higher speeds, moves less. Link to comment Share on other sites More sharing options...
Ian Faulds Posted March 2, 2019 Report Share Posted March 2, 2019 On 01/03/2019 at 10:59, Colin Lindsay said: Mon Joo!! I thought I had the only one of those, and it was a one-off.... definitely not safe for fingers. Sure I saw that in a Bruce Lee kung foo film. 1 Link to comment Share on other sites More sharing options...
SpitFire6 Posted March 2, 2019 Report Share Posted March 2, 2019 Hi, One reason that an electric fan beats mechanical fan. Once the 72 to 98 thermostat is fully open, & your car is moving much above 30MPH, it does not maker much what & where the fan blows air. Cheers, Iain. Link to comment Share on other sites More sharing options...
johny Posted March 3, 2019 Report Share Posted March 3, 2019 Not getting drawn into the mech/elec fan argument but think viscous has the added advantage over flexfan of driving more as its internal fluid gets hotter so its not just speed dependant. Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 3, 2019 Report Share Posted March 3, 2019 As most of the cars on carbs need a good air flow under the bonnet to keep the ambient temperature more stable Im not a fan of electric Having a engine driven fan will be more suited to long periods of hot idle in traffic etc. Pete Link to comment Share on other sites More sharing options...
SpitFire6 Posted March 3, 2019 Report Share Posted March 3, 2019 6 hours ago, Pete Lewis said: As most of the cars on carbs need a good air flow under the bonnet to keep the ambient temperature more stable Im not a fan of electric Having a engine driven fan will be more suited to long periods of hot idle in traffic etc. Pete Hi Pete, That's a valid point especially when the electric fan/s are the low power types where the total power consumption is less than 150 watts or so. Most of the ones on EBay are marked at 200% of true power. The 120-watt ones for example only pull 5 amps. An additional bonus of a correctly sized and positioned e-fan is that it can run when the engine is not running, helping keep things cool prior to a restart. To respond to the original question: A viscous coupled fan would be my choice. Cheers, Iain. Link to comment Share on other sites More sharing options...
AidanT Posted March 3, 2019 Report Share Posted March 3, 2019 Just another thought, but has anyone tried fitting a wider diameter manual fan? Again refering back to Cookies article I decided not to go down the electric route Aidan Link to comment Share on other sites More sharing options...
dave.vitesse Posted March 3, 2019 Report Share Posted March 3, 2019 Yes, a late 2000 saloon type. It also has more blades. It bolts to a heavy adaptor ring that then bolts to the crank. Disappointingly there was no improvements in cooling when stuck in heavy traffic. That was in the hot summer of 1996. No overheating with either fan just an increase reading on the temp gauge, the same result on standard and the 2000 fan. Dave Link to comment Share on other sites More sharing options...
Colin Lindsay Posted March 5, 2019 Report Share Posted March 5, 2019 On 03/03/2019 at 19:56, dave.vitesse said: Yes, a late 2000 saloon type. It also has more blades. It bolts to a heavy adaptor ring that then bolts to the crank. I had one of the earlier ones, no idea why it was in that colour though... nor what I ever did with it! Link to comment Share on other sites More sharing options...
GT6M Posted March 10, 2019 Report Share Posted March 10, 2019 Its no so much as get,n air in , as get,n it oot the bonnet yance its in, try tek,n the rubber strip oft bulkhead for starters, it works wonders, esp at speed M Link to comment Share on other sites More sharing options...
dougbgt6 Posted March 10, 2019 Report Share Posted March 10, 2019 And just beyond the rubber strip is the air intake for the cabin ventilation, so no, won't be doing that! Doug Link to comment Share on other sites More sharing options...
johny Posted March 10, 2019 Report Share Posted March 10, 2019 yes in a Vitesse I can confirm fumes come in the cockpit but with a bit of ingenuity Im sure a seal between intake and bonnet could be fashioned. In the end not necessary as I sorted the lack of cooling directly.... Link to comment Share on other sites More sharing options...
dougbgt6 Posted March 10, 2019 Report Share Posted March 10, 2019 The bulkhead rubber on the GT6 does not make contact with power bulge, so most stick on a secondary seal to the top of the bulkhead rubber in the middle to keep the engine nasties out. db Link to comment Share on other sites More sharing options...
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