ahebron Posted April 30, 2020 Report Share Posted April 30, 2020 While I have the radiator out I decided to shorten the fan mounting boss by 10mm which was an easy job on the lathe, I just had to deepen the hole that the boss fits over the crank by about 4mm. This should give a bit more space between the fan and radiator. I noticed that the rubber bushes the fan mounts with were well past their best. I had a bar of UHMW so turned it down to two halves for each hole, a snug fit on both sides and good shove to get the metal spacer in. Hopefully using these to mount the fan will be ok but I am sure I will be told otherwise😉 Link to comment Share on other sites More sharing options...
johny Posted April 30, 2020 Report Share Posted April 30, 2020 Hmmm this will reduce the cooling effect of the fan but no idea by how much. Interesting to see if you find any difference... Link to comment Share on other sites More sharing options...
Nigel Clark Posted May 1, 2020 Report Share Posted May 1, 2020 That's a very neat job! Nigel Link to comment Share on other sites More sharing options...
Colin Lindsay Posted May 1, 2020 Report Share Posted May 1, 2020 1 hour ago, Nigel Clark said: That's a very neat job! Nigel Neater than mine; I replaced all four rubber mounts on the GT6 engine fan, replaced the radiator and the engine valences and shrouds and only then started it up to find the fan wobbling alarmingly. I thought all of the bolts were tight before I put the tab washers on. I don't really want to have to remove the shrouds, drain and remove the radiator and adjust the fan... Link to comment Share on other sites More sharing options...
JohnD Posted May 1, 2020 Report Share Posted May 1, 2020 On 30/04/2020 at 08:08, johny said: Hmmm this will reduce the cooling effect of the fan but no idea by how much. Interesting to see if you find any difference... Eh? you need to explain why, johny! Link to comment Share on other sites More sharing options...
Colin Lindsay Posted May 1, 2020 Report Share Posted May 1, 2020 6 minutes ago, JohnD said: Eh? you need to explain why, johny! I think Johnny means that moving the fan back from the radiator will reduce the effect ie the suction through the fins; not being technically trained in such it's my concept that a fan close to the rad will suck more air through the rad; further back increases the gap and may allow a modicum of air to be drawn around the sides rather than through. Maybe only a minute amount in the scheme of things? Link to comment Share on other sites More sharing options...
johny Posted May 1, 2020 Report Share Posted May 1, 2020 Correct Colin, thanks. I know its best to have a cowl round any fan to optimise its performance as the air will always try to take the path of least resistance which is round the rad rather than through it... Link to comment Share on other sites More sharing options...
JohnD Posted May 1, 2020 Report Share Posted May 1, 2020 Ah! So! Missed that factoid in ahebron's account! John Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 1, 2020 Report Share Posted May 1, 2020 you do need to take care with fans the rubber bushes are to reduce engine vibrations being magnified by the fan , if too hard you can run into fan blade rupture Pete Link to comment Share on other sites More sharing options...
ahebron Posted May 1, 2020 Author Report Share Posted May 1, 2020 6 hours ago, Pete Lewis said: you do need to take care with fans the rubber bushes are to reduce engine vibrations being magnified by the fan , if too hard you can run into fan blade rupture Pete Thanks Pete Thats what I need to know. Wouldn't this have been worse with the old metal fans then the plastic ones? Link to comment Share on other sites More sharing options...
Peter Truman Posted May 2, 2020 Report Share Posted May 2, 2020 Just a thought if your using a sucker with a fan shroud wouldn't it be better for the fan blade to be slightly off the rad core so your sucking over the whole rad area. I use a pusher on the daughters Spit with wide radiator, I don't think a fan shroud would assist at all, comments pls positive or negatively Peter T Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 2, 2020 Report Share Posted May 2, 2020 7 hours ago, ahebron said: Thanks Pete Thats what I need to know. Wouldn't this have been worse with the old metal fans then the plastic ones? yes certainly ,plastic must be less inertia and more friendly to the vibes Im sure your bushes will be ok it was just some thoughts from my days of fan blades detaching we had large truck ones escape through the cab floor , thats a bit more excessive nastyiness jave look for JohnD post with his harmonic damper test kit and talking metal fans the orig metal ones had a small balance weight on the bolts with drilled location hole and the rubber bushes to fiddle in. Pete Link to comment Share on other sites More sharing options...
ahebron Posted May 2, 2020 Author Report Share Posted May 2, 2020 And not forgetting the beautiful smoothness of the venerable Triumph 6😊 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted May 2, 2020 Report Share Posted May 2, 2020 25 minutes ago, Pete Lewis said: and talking metal fans the orig metal ones had a small balance weight on the bolts with drilled location hole and the rubber bushes to fiddle in. Pete I think (must go look!) I have early Herald fans with the half-moon balance setup; any idea how they would have originally been balanced? Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 2, 2020 Report Share Posted May 2, 2020 they would be spun up on a balancing machine with a ....guard , bit like a tyre balancer maybe a strobe to freeze a mark to show where to get the best place then a drill gave the hole for future alignment google fan balancer gives some modern machines pete Link to comment Share on other sites More sharing options...
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