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Old 07-20-2008, 11:10 PM   #1
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Default Cooling Fan for 4WD 1/10th Buggy?

Anyone here use a cooling fan in a 4WD 1/10th Buggy? Space is pretty tight so I was wondering which one did you use (on what vehicle) and how did you mount it?

I was looking at the Team Integy ones:





But not sure if these will fit into my BJ4WE... What do you guys use in your 4WD 1/10th Buggies?
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Old 07-20-2008, 11:55 PM   #2
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I take it you are refering to the motor cooling fan?
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Old 07-21-2008, 12:23 AM   #3
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Yes, the motor cooling fan, not the ESC fan...
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Old 07-21-2008, 12:33 AM   #4
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The bj4we car has the motor in the same position as a tc3 and 4 right?
If so i would have to look at my friends but the only way i could think of a way off the top of my head is to mount it directly in front of the end bell adhesized to the chasis if you have room, because doesnt the body sit very close to the top and sides.
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Old 07-21-2008, 12:46 AM   #5
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Quote:
Originally Posted by tom_chang79 View Post
Anyone here use a cooling fan in a 4WD 1/10th Buggy? Space is pretty tight so I was wondering which one did you use (on what vehicle) and how did you mount it?

But not sure if these will fit into my BJ4WE... What do you guys use in your 4WD 1/10th Buggies?

tom_chang79 - Just curious to know why you need a cooling fan for the motor? What gearing is in place and are you running Brushless?! I use a Novak 5.5 Velociti and have never needed a fan for my motor.... and that is even if I run for 8 minutes or more in practice...
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Old 07-21-2008, 02:19 AM   #6
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I'm running a 13x2 and I noticed that it gets pretty hot, even with a slightly lower gearing.

The BJ4WE uses TC3 gear box, so the gear ratio should be 2.5 for that. I'm using a 78T spur with 16T pinion so the final ratio should be:

(78/16) * 2.5 = 12.2

Even with 12.2 ratio, my car powered by a NiMH 3300mAH capacity, my motor feels pretty hot after I start to notice the battery starting to fade (I pull it off the track when it starts to fade, which is about 6 to 7 minutes of runtime)...

With a 12.2 final ratio, my car feels like it has enough acceleration, and the top speed tops out at about halfway through the straightaway. I would like to bump my pinion by a tooth or two to make it top out at about 75% of the straightaway. I have more then enough acceleration so I would like to give that up for some top speed, but I don't want to smoke my motor. I think sticking a heatsink + fan on my motor would do the trick in keeping it cool...

Tater Salad: The BJ4 uses similar layout as the TC3/TC4 but the BJ4WE uses a saddle configuration. But you're right, the body does come down so there's not much room on the side of the motor to strap something down. I think I will need a fan somewhere above the top endbell and just mount it down.

I was thinking about getting one of those Integy ones with the fan mount and just extend the fan mount and bend it at a 90-degree angle... That way, it would be secured down on the motor via heatsink and it would be blowing down onto the endbell from above...
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Old 07-22-2008, 12:27 AM   #7
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Do you guys use a 25mm or a 30mm fan? I think I might be able to squeeze a 30mm fan in there... I wish there were some Solidworks models (I suck at modeling) where I can just shift stuff around... Guess I'm going to pull out some paper and scissors and see if I can fit it that way...
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Old 07-22-2008, 01:06 AM   #8
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Do you guys use a 25mm or a 30mm fan? I think I might be able to squeeze a 30mm fan in there... I wish there were some Solidworks models (I suck at modeling) where I can just shift stuff around... Guess I'm going to pull out some paper and scissors and see if I can fit it that way...
I use Team Much More Ultra Fast Fan (25mm) for my Lazer. Go check Tower Hobbies 'cause that's where I bought it and it will definitely cool your motor while running.
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Old 07-22-2008, 08:34 AM   #9
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Thanks SCD, I bought a 30x30mm fan, hopefully I can shove it in my BJ4WE... I did a "paper doll" thing by cutting out a 30x30 square and just placed it in my chassis above the endbell...

Did you just simply tack the fan down with some servo tape?
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Old 07-22-2008, 10:07 AM   #10
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Tom, I am an experienced SolidWorks user (as well as VX user)...solids, wireframes, and surfacing.

Scion has a program where they will give companies CAD models of their parts for free so that aftermarket companies will design parts for their Scions to help boost Scion sales...I wonder if Associated would do the same?

You can see a fraction of my work here:
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Old 07-22-2008, 07:19 PM   #11
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Thanks SCD, I bought a 30x30mm fan, hopefully I can shove it in my BJ4WE... I did a "paper doll" thing by cutting out a 30x30 square and just placed it in my chassis above the endbell...

Did you just simply tack the fan down with some servo tape?
Yep. If you do that, just make sure you use high quality servo tape and keep checking if the fan's about to come off after you run 'cause tapes tend to lose adhesiveness.
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Old 07-22-2008, 08:09 PM   #12
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I use the Novak 25x25x10 fans and shoo goo them to the chassis. They will not come loose until you remove them.
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Old 07-22-2008, 10:02 PM   #13
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Thanks for the tips guys. I know how much vibration and shock our cars are subjected to in an off-road environment. Worst comes to worse, I'll just take a small angled "L" bracket and drill a hole in the chassis and bolt it down...
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Old 07-23-2008, 03:02 PM   #14
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Hey Tom,

When I ran a 6.5R in my B44 the motor used to get pretty hot. I vented the body using a reamer and a dremel; that helped to keep the temp down. I put a vent in the area that's shaped like an air dam in the front side of the body where the motor is located. I also reamed several holes on the body to the side of the motor. I've seen alot of guys do this at the club level. I also put a vent at the very top of the body that looks like an air dam. Hope this helps.
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