Like Tree3Likes

Fan or no

Reply

Old 03-12-2019, 09:41 AM
  #1  
Tech Elite
Thread Starter
iTrader: (81)
 
DPowers's Avatar
 
Join Date: Jun 2007
Location: Where the fast guys are
Posts: 3,584
Trader Rating: 81 (100%+)
Default Fan or no

Do you guys run a fan on your motor or put holes in your body im new to electric so wasnt sure.
DPowers is offline  
Reply With Quote
Old 03-12-2019, 09:52 AM
  #2  
Tech Addict
iTrader: (8)
 
Braxamus's Avatar
 
Join Date: Mar 2014
Posts: 708
Trader Rating: 8 (100%+)
Default

to me and it's just my opinion I would say it all depends on you and how you do stuff. I personally do not but I gear modestly I do not crank the timing up on my motors, and I charge my batteries at a normal rate. Now there are several of the faster guys at my track the do run fans BUT they charge their batteries at a higher rate to get more punch, they crank the timing and gear to the moon so they need it. so like I said it all depends on how you do certain things, and possibly where you race could effect it also.
Braxamus is offline  
Reply With Quote
Old 03-12-2019, 10:44 AM
  #3  
Tech Initiate
 
Join Date: Jan 2018
Location: Marysville, Ohio
Posts: 47
Default

i run fans on my ST and 4wd buggy both are 13.5 but not on my 17.5 2wd buggy
i have never ran mod but from what ive been told no one runs a fan in mod but not sure why
ahe243 is offline  
Reply With Quote
Old 03-12-2019, 10:46 AM
  #4  
Tech Elite
iTrader: (39)
 
EbbTide's Avatar
 
Join Date: Nov 2012
Location: Bay Area, Ca
Posts: 4,015
Trader Rating: 39 (100%+)
Default

Originally Posted by DPowers View Post
Do you guys run a fan on your motor or put holes in your body im new to electric so wasnt sure.
The only time I run a fan is when I need the extra gearing but my motor is running too hot. It is usually good for about a 20 degree Fahrenheit difference which could get you a few extra teeth on the pinion.
EbbTide is offline  
Reply With Quote
Old 03-12-2019, 11:20 AM
  #5  
Tech Elite
iTrader: (20)
 
Join Date: Dec 2011
Location: Texas
Posts: 3,461
Trader Rating: 20 (100%+)
Default

Originally Posted by DPowers View Post
Do you guys run a fan on your motor or put holes in your body im new to electric so wasnt sure.
1/8th or 1/10th scale? I have never used a fan on any 1/8th buggy. 1/10th I use them on 17.5 stock builds because I crank the timing and they run hot. Mod buggy, it just depends.
MX304 is offline  
Reply With Quote
Old 03-12-2019, 12:05 PM
  #6  
Tech Rookie
 
Join Date: May 2010
Posts: 15
Default

I run a fan with my stock buggy (Tekin Spec R 17.5) but I also dont push things very hard. I charge at a modest 1c and am not pushing timing like some at my track (Guy at the track suggested 55 degrees of timing and I am at like 45 or 48 so backed off slightly) and am currently even geared down atm (if I remember right I am at 75 spur 25 pinion atm. Many currently running 26/27 on current layout. I was I initially 26 but liked the extra acceleration in a couple spots; I'm going 5o test 27 next time I can run). I've just always liked keeping various electronics cool and even on PC builds have included extra unnecessary fans because why not
Chenstrap is offline  
Reply With Quote
Old 03-12-2019, 12:21 PM
  #7  
Tech Initiate
 
Join Date: Nov 2018
Posts: 20
Default

Kind of depends on your circumstances. If you want to race and keep up with the fastest guys, then you’ll need a fan for your motor because you’ll be able to gear it and time it more aggressively. I run one for that reason but I wish there was a way to mount a fan without it looking so tacky :/
richard0714 is offline  
Reply With Quote
Old 03-12-2019, 12:36 PM
  #8  
Tech Master
 
Join Date: Jul 2009
Location: Deep South Texas
Posts: 1,317
Default

remember motor fan.. speed controller fan...

I run mod... 10.5... geared easy... no fans at all..

but monitor temperatures... motor and controller....I have never reached 120 degrees "F"... even in 90 degree outside races..
chuck_thehammer is online now  
Reply With Quote
Old 03-12-2019, 12:52 PM
  #9  
Tech Master
 
the rc guy's Avatar
 
Join Date: Aug 2016
Location: Detroit
Posts: 1,164
Default

fan on esc. fan on motor when I can. put holes in body's not really for cooling but to limit my ballooning parachuting .catching air ..
the rc guy is online now  
Reply With Quote
Old 03-12-2019, 01:01 PM
  #10  
Tech Elite
Thread Starter
iTrader: (81)
 
DPowers's Avatar
 
Join Date: Jun 2007
Location: Where the fast guys are
Posts: 3,584
Trader Rating: 81 (100%+)
Default

I run 1\8 and what temps should i be looking for Orion R8.1 and Tekin 1950kv motor. Thanks for the input fellas it much appreciated
DPowers is offline  
Reply With Quote
Old 03-12-2019, 01:18 PM
  #11  
Tech Elite
 
Zerodefect's Avatar
 
Join Date: Apr 2008
Location: Columbus, OH
Posts: 4,465
Default

No fan at all. Even on 4x4 mod buggy. Even geared and boosted to the moon. Piddly short mains and q's don't heat the motor up much when the only straight is hardly 4 seconds long including the sweeper leading onto it.

Fans cost a fraction of a rotor. But I've had a few get damaged. I'm just going to let the rotor roast, and replace it as needed, with the motor bearings. If the motor isn't completely obsolete by then.
Zerodefect is offline  
Reply With Quote
Old 03-12-2019, 01:20 PM
  #12  
Tech Elite
 
Zerodefect's Avatar
 
Join Date: Apr 2008
Location: Columbus, OH
Posts: 4,465
Default

Originally Posted by DPowers View Post
I run 1\8 and what temps should i be looking for Orion R8.1 and Tekin 1950kv motor. Thanks for the input fellas it much appreciated
The motor can handle about the same temps as your hand.

So if you're in pain when you touch the motor, it's too hot.
Goof likes this.
Zerodefect is offline  
Reply With Quote
Old 03-12-2019, 03:26 PM
  #13  
Tech Champion
iTrader: (152)
 
Krio's Avatar
 
Join Date: Mar 2008
Location: At dirt tracks in Michigan!
Posts: 5,526
Trader Rating: 152 (99%+)
Default

Keep the motor below 160 Fahrenheit and the ESC below 200. Motor damage starts above 200 and ESC damage starts in the 240+ range.
MX304 likes this.
Krio is online now  
Reply With Quote
Old 03-13-2019, 08:04 PM
  #14  
Tech Adept
 
Join Date: Jul 2018
Location: Florida
Posts: 194
Default

If the motor spends most of its time in the continuous torque limit of the motor you can get up to 30 percent more continuous torque. This assumes you are at or want to find the continuous torque limit of the motor. If the motor spends more time in peak (accelerations) which is always above continuous a fan wont help unless the average of peak and continuous is under or at the continuous limit.

here is a simplification. If you have a motor that can deliver 200 watts continuously by natural convection you can add another 60 watts to the limit of the motor with a fan.

if half the race is accelerating at 300 watts and half the race is 100 watts you dont need a fan. If accelerating you average 301 watts and 100 watts continuously you need a fan. 101 and 300,,,you need a fan. Timing and gearing are used to move the motor efficiency to the average rpm the track needs. A fan moves the continuous efficiency north by about 20-30 percent at sea level but not exceeding 10,000 feet. At 10,000 feet and up you need a fan to retain sea level continuous torque.


Last edited by Bry195; 03-14-2019 at 06:45 PM.
Bry195 is offline  
Reply With Quote
Old 03-14-2019, 05:54 AM
  #15  
Tech Adept
 
LzREngineering's Avatar
 
Join Date: Jul 2017
Posts: 186
Default

Always run a fan, the magnetic strength of a neodymium magnet decreases with temperature and can be permanently lost if the temperature is too high. Also the resistance of the windings will increase slightly when they are hot. Cold motors always perform better and last longer.
the rc guy likes this.
LzREngineering is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service