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Old 03-10-2009, 09:11 AM   #1
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Default motor heatsink on 2wd ??

might be a stupid question for a 2wd buggy, but can you see any benefits in running a heatsink on the motor?
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Old 03-10-2009, 09:15 AM   #2
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If you think you need it...
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Old 03-10-2009, 09:18 AM   #3
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if u need 1, then somethin is wrong w/the motor, gearing, and/or drivetrain. that and its just a hunk of weight behind the rear suspension. not good

R
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Old 03-10-2009, 09:22 AM   #4
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im hearing people gearing their 17.5 to less then 4.7fdr so want a cooler motor
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Old 03-10-2009, 09:26 AM   #5
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Originally Posted by ultegrasti View Post
if u need 1, then somethin is wrong w/the motor, gearing, and/or drivetrain. that and its just a hunk of weight behind the rear suspension. not good

R
I guess you've never had the experience of a motor that just ran hot?
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Old 03-17-2009, 03:41 PM   #6
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not unless you are planning on running onroad!!!!!!!!!!!
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Old 03-17-2009, 04:08 PM   #7
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our outdoor tracks here are soil so we run step pins mostly , and the high bite causes the 17.5's to run warm esp. in a truck, so I run 1 of the slim profile clip-on heat sinks.It works nice, 10* cooler temps over a 5 min. run.
I will post a pic of the heat sink.
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Old 03-18-2009, 06:42 AM   #8
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do you have a link for that item?

I was looking at cutting one of my normal heatsinks in half otherwise to fit.
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Old 03-18-2009, 07:14 AM   #9
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How about a small fan instead?
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Old 03-18-2009, 08:27 AM   #10
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How about a small fan instead?
Most motor fans are mounted to a heatsink. I never really saw a problem with throwing a heat sink on there... and if your mostly a basher it's great insurance. If you feel that you NEEDa motor fan/heatsink combo on your car... then you should rethink your gearing, but if you just want it for a peace of mind then I say go for it.

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Old 03-18-2009, 09:05 AM   #11
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if you want to run a fan on the motor you may need to get the setup from a lrp tc spec. they have one for the motor that clips on
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Old 03-19-2009, 07:29 PM   #12
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dont think a fan is going to be of any help on a 2wd. I will be cutting a heatsink I already have in half to fit my rb5. Got it geared down to 4.3 now, and it already runs about 160 degrees at 5 min. The heatsink should bring it down 5-10 degrees.
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Old 03-19-2009, 07:55 PM   #13
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OK, I have to ask. When you guys are talking about being geared up to 4.3, are you talking about your final drive or roll-out? I currently run my B4 with a final drive of 5.4 (35 pinion, 72 spur) and that's the highest I can go, I can't find a bigger pinion, and even if I use my slipper-elim, I can only go to 4.8 (35 pinion, 65 spur). My temps with the 72 spur are about 100* after 5 minutes.
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Old 03-20-2009, 12:44 AM   #14
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35/64, isn't that a high? It seems that would be just for top end, and wouldn't think that you would have any low end with that setup. Then again maybe I'm wrong?

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Old 03-20-2009, 08:08 AM   #15
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OK, I have to ask. When you guys are talking about being geared up to 4.3, are you talking about your final drive or roll-out? I currently run my B4 with a final drive of 5.4 (35 pinion, 72 spur) and that's the highest I can go, I can't find a bigger pinion, and even if I use my slipper-elim, I can only go to 4.8 (35 pinion, 65 spur). My temps with the 72 spur are about 100* after 5 minutes.
They make pinions bigger than 35. Im using robinson racing 39t. 4.3 final drive. But that ratio is with a 17.5 brushless. You need to gear them high to get them going anywhere as they are low revvers. I thought around 5.5 was good, until I slowly went down and down, and have arrived at a nice ratio to run, even on a tight twisty track believe it or not. I'm running an rb5 with a 39 pinion and 65 spur. Do a search on "turbo hub". There is a guy on here who makes them. It allows you to run small spur gears on your b4, cr or rb5. I know some guys running 41t on their b4's.
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