medusa 70mm 2000kv wooooott!!! - RC-Monster Forums

e-mike · **medusa 70mm 2000kv wooooott!!! -** 03.14.2009, 12:12 AM

so i receved my 2000kv 70mm this week....installed in my e-revo and tested...so after 20 min my motor was 160f

esc109f(fan spinning),batt 98f...temp outside -15 celcius(5f)

my set-up

e-revo
16/68
6cell lipo
mmmv3
timing lowest,punch contro; 50%
mulcher serie40 tire
all around 10awg wire and 6mm plug

well...i think that im undergeared..(i hope)any idea

thanks

E-Revonut · 03.14.2009, 12:35 AM

Seems a bit hot considering the outside temp! Shouldn't be kicking the fan on at all in those temps. Is there a lot of snow sticking to the truck? Gearing is for about 35-36MPH I believe which should be easy for that setup. 160 isn't horrible but 98 on the lipos in 5* ambient isn't great or the fact that the fan on the MMM is on. I'd def play with the gearing, gear down if the snow is sticking to your truck resulting in a 20lbs snowball at the end of your run! Which ever way you go, check temps often!

Unsullied_Spy · 03.14.2009, 06:26 AM

16/68 ARE YOU SERIOUS! That sounds way overgeared to me. Medusa motors typically run 10 degrees or so cooler than an equivalent Neu, and my amp hog 1515 1.5D ran 140ish in 90-100 degree weather geared 22/62. If you have a smaller spur gear go ahead and put that on and your motor temps should drop.

Did you notice it was hitting full RPMs too quickly? That usually means you are overgeared, I almost never hit full RPMs out of either A) Fear of hitting something at that speed or B) Run out of room too fast.

BL_RV0 · 03.14.2009, 11:11 AM

Yeah, I'd say its undergeared as well. Did you run a neu with that same setup/gearing? What were your temps with it?

e-mike · 03.14.2009, 11:20 AM

Quote:

Originally Posted by BL_RV0

Yeah, I'd say its undergeared as well. Did you run a neu with that same setup/gearing? What were your temps with it?

yes a 1515 1.5y and my temps was 80f....(no snow sticked in the truck)ive tryed each of my neu and they never pass 90f.....(1515 1y,1515 2.5d,1515 1,5d and 1515 1,5y)all this motor on 6 cell lipo, same temp outside same gearing,,,i will try to gear up today...maybe

BL_RV0 · 03.14.2009, 11:27 AM

Gear up and see what happens.

e-mike · 03.14.2009, 02:45 PM

good news...i tried 18/68and ive got 108f(motor) after 25min at 10f outside

esc 105(fan spinning!!??) and my lipo was 79f

i was undergeared

thanks guy's

Unsullied_Spy · 03.15.2009, 05:33 AM

2 teeth on the pinion made that big of a difference

I was thinking something more along the lines of a 58 or 62T spur

As long as you already have the pinion and it did the job that's good (I usually suggest spur changes rather than pinion because they cost 1/4 as much).

03.16.2009, 05:37 PM

Sounds like you got your issue resolved by gearing up...but perhaps you should take a look at your timing as well. Medusa recommends 8-15 degrees on their website for best efficiency.

In the Medusa section last week one person was having overheat problems running 036-060-2200 in a 1/8 buggy with low timing. Problem was resolved by changing timing to "Normal 10." Maybe something you could consider experimenting with.

e-mike · 03.18.2009, 06:18 AM

last update on my motor....after 5 run it died

for me medusa are crap

the magnet come appart the shaft ...it was 138f,esc118(v1) and lipo 96f

i will ppst pics later today

Unsullied_Spy · 03.18.2009, 08:47 AM

Wow, that's the first one I've ever heard of coming apart. E-Mail them and they will probably replace it for free though.

lutach · 03.18.2009, 09:35 AM

Quote:

Originally Posted by e-mike

last update on my motor....after 5 run it died

for me medusa are crap

the magnet come appart the shaft ...it was 138f,esc118(v1) and lipo 96f

i will ppst pics later today

I've seen more Nue Motors (A few of my Aveox did the same thing, but they are old) have this problem then Medusa. I don't own a Medusa so I'm not brown nosing at all. Now, Medusa seems to have the best warranty advertised so try that out before claiming they are crap. Keep in mind your motor reached 160F and the temps iside might've been higher causing the rotor assembly to come unglued from the shaft as heat plus torque will cause this.

Finnster · 03.18.2009, 12:00 PM

Plus you are spining the motor really fast on 6S, doesn't help when you are severly undergeared, hot and revving the piss out of it.
FWIW, my neu's magnet came off the chaft once as well. They fixed for free, or if you have the correct locktite (HD green for bearings iirc) you can do it yourself.

lutach · 03.18.2009, 12:21 PM

Quote:

Originally Posted by Finnster

Plus you are spining the motor really fast on 6S, doesn't help when you are severly undergeared, hot and revving the piss out of it.
FWIW, my neu's magnet came off the chaft once as well. They fixed for free, or if you have the correct locktite (HD green for bearings iirc) you can do it yourself.

Right on. I didn't see the 6S lipos part. It's strange because in his sig. it shows a 1515/1.5Y which is a 1500Kv motor and perfect for 6S. If he does send the 2000Kv motor back, I would recommend him getting the 70-1600 for his 6S application.

e-mike · 03.18.2009, 04:23 PM

look...

so i know that my motor reached 158f(exactly)but i dont really think that is caused my failure...!!!???

and it was 10 mintes that ive running my truck and the revo stop suddenly..