R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 07-25-2012, 06:08 AM   #1
Tech Regular
 
narcotiks's Avatar
 
Join Date: Dec 2011
Location: Melbourne, Australia
Posts: 452
Trader Rating: 8 (100%+)
Default Heatsink and fan vs fan

Does running a heatsink aswell as a fan have a greater cooling effect versus just a fan blowing directly onto the motor? Using a 40mm fan powered straight off the battery, and the actual heat sink part from the LRP radical cooling set.
narcotiks is offline   Reply With Quote
Old 07-25-2012, 06:49 AM   #2
Tech Elite
 
Skiddins's Avatar
 
Join Date: Feb 2006
Location: Windsor, UK
Posts: 4,762
Default

I found that the heatsink fan combo will cool the motor slightly better than just fans.
The size of the heatsink massively increases the surface area so it can be cooled more efficiently.

I use virtually the same heatsink and fan and leave it running on the car a few minutes before the race as well.

Skiddins
__________________
Xray T4'18, T4'14 (Wet Car)
Xray X12 2018
Xray X1'16
wlrc.co.uk (West London Racing Centre)
RCDisco.co.uk
Skiddins is offline   Reply With Quote
Old 07-25-2012, 07:27 AM   #3
Tech Fanatic
 
Join Date: Jan 2012
Location: Carrollton, TX
Posts: 902
Trader Rating: 27 (100%+)
Default

My results were opposite. Running the yeah racing heat sink and fan combo, my temps were significantly higher than running fan only. I was hitting 185-190f with both, while only getting to 170-175 with just the fan. I figured it was cuz the fan wasn't powerful enought to cool the heatsink and the motor, so all the heat was trapped there.

I never bothered trying to change fans though. Might be worth trying.
hyujmn is offline   Reply With Quote
Old 07-25-2012, 08:16 AM   #4
Tech Elite
 
Skiddins's Avatar
 
Join Date: Feb 2006
Location: Windsor, UK
Posts: 4,762
Default

Quote:
Originally Posted by hyujmn View Post
My results were opposite. Running the yeah racing heat sink and fan combo, my temps were significantly higher than running fan only. I was hitting 185-190f with both, while only getting to 170-175 with just the fan. I figured it was cuz the fan wasn't powerful enought to cool the heatsink and the motor, so all the heat was trapped there.

I never bothered trying to change fans though. Might be worth trying.
It's also very dependent on how good of a fit the heatsink is around the motor.

The cheaper heatsinks seem to only make contact with the motor can in a couple of places which makes them virtually useless.
The LRP I have is very tight to get on.

Skiddins
__________________
Xray T4'18, T4'14 (Wet Car)
Xray X12 2018
Xray X1'16
wlrc.co.uk (West London Racing Centre)
RCDisco.co.uk
Skiddins is offline   Reply With Quote
Old 07-25-2012, 06:28 PM   #5
Tech Addict
 
FauxMako's Avatar
 
Join Date: May 2011
Location: Marietta, GA
Posts: 523
Default

Quote:
Originally Posted by Skiddins View Post
It's also very dependent on how good of a fit the heatsink is around the motor.

The cheaper heatsinks seem to only make contact with the motor can in a couple of places which makes them virtually useless.
The LRP I have is very tight to get on.

Skiddins
Yeah, a lot of things sold in the RC market as "heat sinks" aren't really heat sinks and would more properly be called fan holders. If the "heat sink" you got from Yeah Racing is the one I'm thinking about it is really a fan holder -- it doesn't do anything to help disapate heat it just holds the fan.

A heat sink is like a radiator. It should fit tightly to the motor (maximize motor surface to heat sink surface contact). It should provide a large increase in surface area (maximize surface area to allow heat to disapate).

I'm running just heat sinks -- no fan -- and get about a 20*F temperature drop over no heat sink. They have 9 fins and stick up about an inch from the motor. I'd guess their total surface area to be about 18 sq inches.
__________________
Mike

3 3Racing Sakura Zeros: Mustang Boss VTA // Lexus LFA USGT // MazdaSpeed 6 TC
Mini M03 & M05
Life is better with a soundtrack
FauxMako is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
heatsink vs fan captain stacker Electric On-Road 38 01-25-2010 08:04 AM
RS pro-vs-SP Gt 2.0-vs-LRP stock spec dawgmeat Electric On-Road 36 04-21-2009 04:54 PM
Novak GTB heatsink question? intimidator Radio and Electronics 9 08-12-2008 09:18 AM
Five vs. six cells CAlbrecht Electric On-Road 76 06-10-2007 07:47 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 03:57 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net