Mini-Z, Kyosho Mini-Z Racer, MR-03, MR-02, MA-010, Forums, News, Pictures, Parts, and Shop - Mini-ZRacer.com
Forums, Mini-Z, MiniZ, Kyosho Mini-Z, Kyosho MiniZ, Kyosho Mini-Z Racer
Mini-Z Hop-Ups, Mini-Z Parts, MiniZ Hop-Ups, MiniZ Parts, Kyosho Mini-Z Hop-Ups, Kyosho Mini-Z Parts, Kyosho MiniZ Hop-Ups, Kyosho MiniZ Parts, Kyosho Mini-Z Racer Hop-Ups, Racer Kyosho Mini-Z Parts
Old 2016.08.10, 04:24 PM   #46
refsiul22
Registered User
 
refsiul22's Avatar
 
Join Date: Aug 2014
Posts: 74
70T overheating

Old thread.... but still interesting!

I have been racing a Stock (PN 70T motor fixed gear ratio 13 Pinion 53Spur) category for a few weeks in our club. Car has been great and competitive but have noticed that my motor temperature has been too high (forgot to bring a temperature gun to the track, but to give you a reference, you can’t touch the motor after a few minutes of racing..)

I’m running a PN chassis with a Kyosho ASF board, PN 70T motor, 13 Pinion 53 Spur on a 94mm Lexus car. I have compared to other racers and their motor temps were much lower and OK compared to mine. I have cleaned and lubricated the motor, checked the brushes, diff, bearings, etc. everything smooth.

Car works great, and have won several Mains recently but I’m kind of confused at what’s causing the overheating.. I will try to cover all suggestions above... but do you have any updated suggestions or similar experiences/solutions?

In the following weeks, I will try to update the temp that my motor is reaching.

***
PD. Forgot to mention that (as far as I know) I'm the only one using gear diff

Last edited by refsiul22; 2016.08.11 at 06:22 PM. Reason: additional info..
refsiul22 is offline   Reply With Quote
Old 2016.08.10, 05:54 PM   #47
mleemor60
Curmudgeon & Moderator
 
mleemor60's Avatar
 
Join Date: Jan 2008
Location: Kannapolis, NC
Posts: 2,549
Look for any kind of binding first. Anything. I have seen the pinion work it's way out the motor shaft until the base of the teeth comes in contact with the spur. Almost not noticeable unless under load. Maybe a little change in motor pitch but little other warning. You may find a piece of hair wrapped around the axle at one or both hubs. Check solder joints for weakening connection which can cause excessive current draw. What condition are the brushes in? How is the tension. Using "comm" drops? Things like that. Heat means it is being overworked either electrically or mechanically. For the motor to be "on pipe" you should be able to use the lip test. If you can hold the motor to your bottom lip for a second or two without raising a blister you are where you need to be gear wise. Any hotter and you need less gear. Any colder and you need more gear. At 13/53 or 4.07:1 I would say you are geared way to high unless you are running the Bonneville Salt Flats. You said that was a "spec" ratio. I would like to be the one selling motors with that ratio. Just for sh1ts and giggles try an 11T pinion with no other changes and see if the motor cools down along with quicker lap times. If it does I would lobby for a different required ratio.
mleemor60 is offline   Reply With Quote
Old 2016.08.11, 06:43 AM   #48
arch2b
Moderator
 
arch2b's Avatar
 
Join Date: Sep 2002
Location: Washington, DC
Posts: 35,480
Send a message via AIM to arch2b
if others are running the same ratio and do not have the same issue, hard to point to the ratio in this case... if it were so, all would have the problem. in the end, it could be he just got the bum motor, it happens.

have you tried another of the same motor? just one thing to add to checklist of things to run down.
arch2b is offline   Reply With Quote
Old 2016.09.12, 01:43 PM   #49
refsiul22
Registered User
 
refsiul22's Avatar
 
Join Date: Aug 2014
Posts: 74
update

tried a backup 70T motor and had the same problem..

some findings/updates:
-temp after a few minutes of racing reaches 130F
-motor were cleaned and lubricated prior to racing.
-peer racers (same ratio and track conditions) reach 95-100F
-changed from gear to ball differential to see if it made a difference. Temp was slightly lower, but still way above peers.

will try 70Ts motor on second car and solder some 50T, 39T motor to racing car for tests.
refsiul22 is offline   Reply With Quote
Old 2016.10.21, 01:17 PM   #50
EMU
EMUracing
 
EMU's Avatar
 
Join Date: Oct 2004
Location: NYC
Posts: 7,417
Send a message via AIM to EMU
Quote:
Originally Posted by refsiul22 View Post
tried a backup 70T motor and had the same problem..

some findings/updates:
-temp after a few minutes of racing reaches 130F
-motor were cleaned and lubricated prior to racing.
-peer racers (same ratio and track conditions) reach 95-100F
-changed from gear to ball differential to see if it made a difference. Temp was slightly lower, but still way above peers.

will try 70Ts motor on second car and solder some 50T, 39T motor to racing car for tests.
Have you made any ICS adjustments for power delivery? Are you aggressive with throttle/brake? How low is your motor, depending on mounts, some can rub the track when in the lowest positions increasing heat.

How new is the motor? Do you have an OLD motor you could try, or borrow from someone that you know does not get hot over a battery pack.

I have had some electronics that made the motors get a little hotter, and they were always a little faster than others (they would be used for stock classes). The difference was not 30f though, maybe 5-10f at most.
__________________
EMUracing
Micro RC Syndicate /DG Designs /GSR /Reflex Racing /Fast By Faqish /MurderTown Racing
EMU is offline   Reply With Quote
Old 2016.10.21, 03:07 PM   #51
TheSteve
VE7FM
 
Join Date: Oct 2010
Location: Langley, BC
Posts: 629
Swap cars with a friend for a race, see what the temps are like.
TheSteve is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mini Speedway Kyosho Stock Motor Cleaning Test schmenzer Motor Tech 3 2008.02.25 12:20 AM
Best all around Stock Motor to use without Fet upgrade Warchild Motor Tech 37 2005.11.07 08:33 AM
Tips and Tricks on the NML SSV.3 NOMOTORLIMIT Motor Tech 1 2005.02.20 03:49 PM
Review of NML non Turbo motor!!! MazdaSpeedRX-7 Motor Tech 12 2003.02.27 12:27 PM
The Truth On How To Make Your Very Own Armature For Your Your Mini-z Motor!!!! manchowder4u Miscellaneous Discussion 7 2002.08.22 03:14 PM


All times are GMT -5. The time now is 10:36 AM.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2011 Mini-ZRacer.com
Mini Inferno Sale - Up to $85 Instant Savings!
Micro-T Hop-Ups
RC18R, M18, Micro RS4, Mini-LST, TamTech-Gear, Minizilla, RC18T, RC18B, RC18MT
shop.tinyrc.com Products

more»
Tiny RC Community News
[03/22/17] MZR was on vacation, didn't... : All kidding aside, the host experienced a bit of a server meltdown last week and efforts to restore the site to a new server took longer than anticipated. The current server is temporary until - more»
[11/25/15] Did You Hear? Our Black... : Hey Racers,
We're getting started a bit early with our Black Friday sale this year.  Generally we're not supporters of retailers opening early on Thanksgiving, but in our case, we're - more»
[06/30/15] shop.tinyrc.com: Have You... : Hey All! Just a quick reminder to everyone that we post all of our shop.tinyrc.com Newletters here on the MZR Forum. If for some reason you miss them in your email inbox, you can always see the - more»
Mini-Z, Mini-Z Racer, MR-02, MA-010
M18, M18T, RC18T, Mini-LST, Mini-T, Micro RS4, XRay, 1/18, 18th scale
XMODS, XMOD, Micro Flight, ZipZaps, ZipZaps SE, Bit Char-G, MicroSizers, TTTT, Plantraco Desktop Rover, SuperSlicks, Digi Q
Mini Inferno, Mini Inferno ST, half EIGHT, 1/16, 16th scale
Epoch, Indoor Racer, 1/43, 43rd scale
E-Savage, eSavage, eZilla, e-Zilla, HPI
Robots, Bots, Bipeds, Wheeled, Manoi, Roomba, NXT, Lego, Hacking
Crawling, Crawlers, Micro, RC, Losi Mini-Rock Crawler, Duratrax Cliff Climber
Kyosho Minium, Caliber 120, Minium Forums
Mini-Z Hop-Ups, Mini-Z Parts, Mini Inferno Hop-Ups, Mini Inferno Parts, M18 Hop-Ups, M18 Parts