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Post by kennedylanduk on Jul 7, 2016 9:01:35 GMT
Has anyone even bothered experimenting with different fan positions? I cannot imagine it makes much difference as the can is the motor can is a great heat conductor.
Only asking as our new Wild Turbo Fans arrived yesterday, so I've got to mount them somehow.
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Post by Dave Chamberlain on Jul 8, 2016 6:35:09 GMT
It's not just positions Tony, it's also suck or blow!!!
Personally I always use the fan to assist the normal air flow over the motor.. For example if you are mounting the fan behind the motor to the rear of the car I'd have it sucking the air from the front to the rear so it accelerates the natural flow.. I don't see any point in have it trying to blow against the normal air flow direction..
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ianlloyd
Lapping the Back Markers
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Post by ianlloyd on Jul 8, 2016 7:47:58 GMT
Good point Dave but I have always been told that blow is better than suck so mabe mount the fan inside so it blows rearward over the motor. I have a small problem with this though because it means mounting the fan between the speedo and motor. That means it is effectively sucking hot air from the speedo and blowing it over the motor. Also there could be a chance it disrupts the working of the fan mounted on the speedo.
For these reasons I mount my fan behnd the motor and blowing forwards. This may well be not the most efficient method but is the simplest.
There may also be a case for mounting the fan on top of the motor.
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Post by Dave Chamberlain on Jul 8, 2016 12:14:53 GMT
Hmmm, not sure blow is always better than suck Ian, I definitely think it depends where you have the fan placed and the direction natural airflow.. One thing is for sure those WTF fans are very good and shift a lot of air!
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Post by kennedylanduk on Jul 8, 2016 18:46:39 GMT
I'll probably mount over the motor and blow down.
It will be interesting to see if it makes much difference. We've been running without fans, the motors run between 60-70 degrees C, we might be able to increase the timing even more.
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Post by kennedylanduk on Jul 10, 2016 13:55:54 GMT
We've got fans. One quick question, in the bag was a small piece of clear plastic the same size as the fan area. Anyone know what it's for?  |
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Post by Dave Chamberlain on Jul 11, 2016 6:18:10 GMT
No idea Tony, I've got the smaller version on one of my ESC's but don't remember getting a bit of plastic you described.. Just got a load of WTF! stickers  |
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Post by kennedylanduk on Jul 11, 2016 10:03:20 GMT
I wonder if I'm supposed to attach it to the fan somehow to aid airflow. But they don't have any adhesive on them, so really not sure. I'll try emailing them.  |
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Post by kennedylanduk on Jul 11, 2016 10:04:33 GMT
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Post by theslacker on Jul 11, 2016 13:39:41 GMT
Tony, im pretty sure the small plastic is supposed to be used as ducting to channel air over the motor rather than round the whole car.
Ive always run my fan with it blowing over the motor from back to front, i have no scientific reason to why i have just always assumed blowing cool air over a motor would be more beneficial than sucking hot air away from it. I have always ran the fan at the rear of the car so it is blowing air against the normal airflow but id be interested to know how much air flow you actually get inside a TC with a bodyshell on. I cant imagine you get any natural airflow around the rear side of the motor as the motor itself would shield it. Saying that if you do get natural airflow from front to back in the car it would only cool the side of the motor nearest the front in which case having the fan mounted at the back of the motor blowing inwards would then cool the back side of the can.
Not to mention extracting hot air causes the fan to suck said hot air over itself which can in some cases reduce the service life and most definitely the efficiency of the fan motor.
Im not 100% sure but i believe most of the ESCs we use actually blow cool air over the heatsink rather than extract the hot air from it.
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Post by kennedylanduk on Jul 11, 2016 16:36:54 GMT
Tony, im pretty sure the small plastic is supposed to be used as ducting to channel air over the motor rather than round the whole car. That makes sense. I've emailed them to ask, so hopefully they will confirm. I've put the fans in blowing back to front purely due to space. And I need to move it a little more as the "tips" say it should be 10mm away from the motor. |
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Post by kennedylanduk on Jul 13, 2016 8:39:46 GMT
Reply from the WTF people,
"The square plastic is for making a simple guide. For example. putting it on top or side of the fan using double sided tape and cut into any shape you want. "
Think I'll cut mine into the shape of a star.
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ianlloyd
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Post by ianlloyd on Jul 13, 2016 8:51:00 GMT
There is also an argument that a fan is actually detrimental to the motor as it can only ever cool the outside of the can. The heat from the inside is the problem, the stator and rotor actually do not get cooled by an external fan so in fact you are possibly kidding yourself that you are cooloing the motor when actually all you are doing is reducing the external temperature. As you check temps on the outside only it is possible the area you are temp checking is cooled by the fan so you are getting a false reading of the actual internal temp of the motor. It is possible you can overheat a motor when in operation because of the possible false temp readings you are taking from the exteranl cooled area.
Or did I just make all that up.
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ianlloyd
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Post by ianlloyd on Jul 13, 2016 8:53:09 GMT
It is quite interesting that if you look at the top drivers cars you very rarely see any with a fan fitted. I wonder why that is?
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Post by wessex88 on Jul 13, 2016 8:58:46 GMT
It is quite interesting that if you look at the top drivers cars you very rarely see any with a fan fitted. I wonder why that is? Does that make Me a top driver?  |
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ianlloyd
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Post by ianlloyd on Jul 13, 2016 9:39:50 GMT
Yes Paul, of course it does......  |
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Post by kennedylanduk on Jul 13, 2016 13:01:41 GMT
It is quite interesting that if you look at the top drivers cars you very rarely see any with a fan fitted. I wonder why that is? Are you trying to put the rest of us off installing fans so you can gain that extra place? |
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Post by theslacker on Jul 13, 2016 13:30:41 GMT
There is also an argument that a fan is actually detrimental to the motor as it can only ever cool the outside of the can. The heat from the inside is the problem, the stator and rotor actually do not get cooled by an external fan so in fact you are possibly kidding yourself that you are cooloing the motor when actually all you are doing is reducing the external temperature. As you check temps on the outside only it is possible the area you are temp checking is cooled by the fan so you are getting a false reading of the actual internal temp of the motor. It is possible you can overheat a motor when in operation because of the possible false temp readings you are taking from the exteranl cooled area. Or did I just make all that up. Surely by cooling the outside of the motor the internal temperature is reduced as naturally the heat conducts through all the metal parts. If your not cooling it per-se then you are at least maintaining a certain temperature. Its how fans on normal cars have worked for years, they cool the block, in turn this stops the internal components from reaching an unworkable temperature. |
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Post by theslacker on Jul 13, 2016 13:33:55 GMT
It is quite interesting that if you look at the top drivers cars you very rarely see any with a fan fitted. I wonder why that is? Am i not right in saying that in any boosted class youll find the motor temps are naturally lower as the ESC does more work? 17.5 blinky is a different animal as its normally max timing on the motor.. Ive not see any pros cars to know for sure which class they run.. |
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ianlloyd
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Post by ianlloyd on Jul 13, 2016 14:22:40 GMT
In a car the fan only forces air through the radiator to cool the water that circulates through the block. The fan has no effect at all on the block itself it is the water that cools it. So maybe we should look at water cooling our motors? There are kits out there to do it but are banned by the BRCA I believe.
What I am saying is the cooling of the outer can on a motor may give a false reading as the inner temperature is what matters.
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