R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 03-16-2014, 09:25 PM   #1
Tech Master
 
Join Date: Jan 2010
Posts: 1,621
Default motor cooling fan - suck or blow?

Some cars have a fan mount to the rear of the car.
Should this fan be mounted to blow towards the front, or suck towards the rear?
Which would provide better cooling for the motor?
Eivind E is offline   Reply With Quote
Old 03-16-2014, 09:33 PM   #2
Tech Champion
 
hanulec's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2007
Location: @ the post office
Posts: 8,558
Trader Rating: 27 (100%+)
Default

blow..
__________________
FJ / ROAR #2-122945 / MaxRotation FPV Drone Racing / [email protected] Awesomatix USA / Wild Turbo Fan / Mon-Tech Racing / RocheRC USA / Side Piece /
LRP / John's BSR Tires / TeamEAM / TQ Wire / R1 / Team Scream / PCR / MIX
RacerLog wiki Awesomatix A700 / 2wd offroad 4 life
hanulec is offline   Reply With Quote
Old 03-16-2014, 09:35 PM   #3
Tech Elite
 
Potoczak's Avatar
 
Join Date: Oct 2009
Location: PA
Posts: 3,609
Trader Rating: 112 (100%+)
Default

I have always placed my fans so they blow onto the motor.
__________________
Pete Potoczak

Home entertainment specialist
Secure Technologies/ www.stiworldwide.com
Potoczak is offline   Reply With Quote
Old 03-16-2014, 10:43 PM   #4
Tech Elite
 
Josh-n-ya's Avatar
 
Join Date: May 2011
Location: Alameda, CA
Posts: 2,189
Trader Rating: 75 (100%+)
Default

both
Josh-n-ya is offline   Reply With Quote
Old 03-16-2014, 10:47 PM   #5
Tech Elite
 
Join Date: Nov 2008
Posts: 2,132
Trader Rating: 7 (100%+)
Default

Quote:
Originally Posted by Josh-n-ya View Post
both
lol. its just gone terribly wrong...
dragonracing is offline   Reply With Quote
Old 03-17-2014, 02:08 AM   #6
Tech Adept
 
Join Date: Feb 2010
Location: Wollongong Australia
Posts: 204
Trader Rating: 3 (100%+)
Default

I run 1 fan in front of the motor blowing onto it and 1 fan behind the motor sucking away the hot air. This setup gets good airflow over the motor.

Simon
Team_Krusty is offline   Reply With Quote
Old 03-17-2014, 02:30 AM   #7
Tech Master
 
xrayracer1's Avatar
 
Join Date: Feb 2013
Location: Under your bed.
Posts: 1,186
Trader Rating: 1 (100%+)
Default

I always have the fan blowing air onto the motor.
__________________
Gavin.

Converting nitro to electric is utter blasphemy.
xrayracer1 is offline   Reply With Quote
Old 03-17-2014, 05:29 AM   #8
Tech Fanatic
 
d16dcoe45's Avatar
 
Join Date: Oct 2007
Location: Armonk, NY
Posts: 947
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by Team_Krusty View Post
I run 1 fan in front of the motor blowing onto it and 1 fan behind the motor sucking away the hot air. This setup gets good airflow over the motor.

Simon
Which is fine as you are in AUS, but for the states I believe ROAR rules for TC are 1 fan only and 30mm max mounting size.
__________________
Jay Lestingi

Tamiya 419x/Associated TC7.1/Sanwa M12s/Xpert servos
d16dcoe45 is offline   Reply With Quote
Old 03-17-2014, 11:25 AM   #9
Tech Elite
 
dan_vector's Avatar
 
Join Date: Oct 2013
Posts: 3,924
Trader Rating: 27 (100%+)
Default

Blow baby blow!!!
__________________
Serpent Viper 977e EVO2, Serpent Viper 988 GP, Serpent Project 4x, Serpent 811T-TE Truggy, Serpent 811e 2.1, Serpent SRX2-MH, Serpent SRX-2 RM, Serpent SRX-4, Serpent F110-SF2, Serpent F180, Serpent 748 Natrix WC, Serpent Cobra GT 3.1, Serpent SRX8, Serpent S811 2.2, Baja 5B Flux, Atomic AMZ 1/27th, Schumacher GT12 SS.
Sanwa, Ielasi Tuned Novarossi Racing Engines, Tekin, Hobbywing, Muchmore.
dan_vector is offline   Reply With Quote
Old 07-12-2016, 01:43 AM   #10
Regional Moderator
 
disaster999's Avatar
 
Join Date: Aug 2001
Location: Hong Kong
Posts: 3,178
Trader Rating: 1 (100%+)
Default

Resurrecting an old thread...

Im thinking of 3D printing a custom fan shroud/mount for my TC and I was thinking about whether to have the fan blowing at or sucking from the motor. I can only mount the fan behind the motor as I dont have enough space between the ESC and motor.

Having a fan behind the motor blowing blowing at it always seemed counter intuitive as the flow from the fan is competing against the wind coming from the moving car. Obviously having a shroud around the fan and aiming at the motor would be more effective, but Im wondering if having the same shroud around the fan but sucking air around the motor be just as effective, if not, more effective as the general flow is inline with the direction of where the fan is blowing at.
disaster999 is online now   Reply With Quote
Old 07-12-2016, 01:57 AM   #11
Tech Master
 
gigaplex's Avatar
 
Join Date: Dec 2015
Location: Melbourne, VIC
Posts: 1,566
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by disaster999 View Post
Resurrecting an old thread...

Im thinking of 3D printing a custom fan shroud/mount for my TC and I was thinking about whether to have the fan blowing at or sucking from the motor. I can only mount the fan behind the motor as I dont have enough space between the ESC and motor.

Having a fan behind the motor blowing blowing at it always seemed counter intuitive as the flow from the fan is competing against the wind coming from the moving car. Obviously having a shroud around the fan and aiming at the motor would be more effective, but Im wondering if having the same shroud around the fan but sucking air around the motor be just as effective, if not, more effective as the general flow is inline with the direction of where the fan is blowing at.
The simple answer is to try both configurations and measure the temperature of the motor.
gigaplex is offline   Reply With Quote
Old 07-12-2016, 02:29 AM   #12
Tech Elite
 
Skiddins's Avatar
 
Join Date: Feb 2006
Location: Windsor, UK
Posts: 4,759
Default

Quote:
Originally Posted by disaster999 View Post
Resurrecting an old thread...

Im thinking of 3D printing a custom fan shroud/mount for my TC and I was thinking about whether to have the fan blowing at or sucking from the motor. I can only mount the fan behind the motor as I dont have enough space between the ESC and motor.

Having a fan behind the motor blowing blowing at it always seemed counter intuitive as the flow from the fan is competing against the wind coming from the moving car. Obviously having a shroud around the fan and aiming at the motor would be more effective, but Im wondering if having the same shroud around the fan but sucking air around the motor be just as effective, if not, more effective as the general flow is inline with the direction of where the fan is blowing at.
Your question has already been answered in some of the above posts.
The cooling effect of the fan will always be greater if it's blowing onto the motor.

Is there any way to create enough room in front of the motor if you fit a smaller receiver etc?
__________________
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 07-12-2016, 04:32 AM   #13
Tech Fanatic
 
Airwave's Avatar
 
Join Date: Jul 2007
Posts: 784
Trader Rating: 1 (100%+)
Default

Blow
Airwave is offline   Reply With Quote
Old 07-12-2016, 05:00 AM   #14
Tech Adept
 
massenb203's Avatar
 
Join Date: Jul 2016
Location: Fayetteville, NC
Posts: 173
Default

Quote:
Originally Posted by disaster999 View Post
Resurrecting an old thread...

Im thinking of 3D printing a custom fan shroud/mount for my TC and I was thinking about whether to have the fan blowing at or sucking from the motor. I can only mount the fan behind the motor as I dont have enough space between the ESC and motor.

Having a fan behind the motor blowing blowing at it always seemed counter intuitive as the flow from the fan is competing against the wind coming from the moving car. Obviously having a shroud around the fan and aiming at the motor would be more effective, but Im wondering if having the same shroud around the fan but sucking air around the motor be just as effective, if not, more effective as the general flow is inline with the direction of where the fan is blowing at.
I find it hard to see where the fan is competing for the same air as the moving car due to that the car is so low to the driving surface that very little air is traveling under the body.
__________________
Henry Massenburg

Team C Racing USA, TC10 2015
Ho-B Max
USVTA Member #230
massenb203 is offline   Reply With Quote
Old 07-12-2016, 06:38 AM   #15
Tech Elite
 
theproffesor's Avatar
 
Join Date: Feb 2005
Location: Lugoff SC
Posts: 2,834
Trader Rating: 58 (100%+)
Default

From the rear, blowing at the motor. Leave between 5mm - 10mm of space between the fan and the motor. To close and you won't get adaquate airflow. If you want a shroud, you don't need a 3d printed one. Just use a coup pieces of lexan attached to the sides of the fan. Just remember to leave room for air to escape.

If there was enough natural airflow in the car to compete with a fan, we wouldn't need fans.
__________________
The brighter the picture, the darker the negative. USVTA member #112
theproffesor is offline   Reply With Quote
Reply



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 09:17 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net