HW Ezrun sl3674 fried in 5 minutes
 

Last week I finally got the Ezrun 150A combo with program card, 2350KV motor and a 21 pinion which I ordered from e-bay. It took 4 weeks to get it, after reading some topics on this forum I believe it took so long because there was a firmware problem. The set that I got had a black motor and heatsink with V2 printed on the housing, I think I have the updated version, but I'm not going to set the punch to 1 to test this...

Back to the topic....I build it in my 3905 emaxx, set the esc to 4S lipo's as described in the manual. also set the lipo cut-off to 4S and lined it up with my transmitter, a DX3S
I use two 5100mAh 2p2s 25C lipopacks in series, had the gearing set to 17/68.
So I went to the road. Switched everything on and carefully start to drive. The power!!!! until...frzzzzlpoppop, smoke, stuttering. Ran to the car, pulled the body off and switched everyting off. After inspection it seemed that the solder from the deans I used had melted....
Went to the workbench and after soldering the wires back on the deans connected everything again. In a few seconds the wires from the esc to the lipo became that hot that the solder started to melt again.
Again I switched the esc off and pulled the motor from the esc. Opened it up and saw this:
http://img.photobucket.com/albums/v4...181024x768.jpg
Does any body has an idea of what happened. It smelled very burned and the innerhousing with the copper wires was burned too. I mailed hobbywing last thursday but didn't get a reply up to know

I didn't have another motor to test the esc so I went to the LHS and it was working fine. The owner of the lhs gave me a Robbe 36-50 3350KV to test in the emaxx, and the maxx ripps with that little engine with max temps of 75 C on heavy bashing. To be honoust I have to keep it cool with a fan, but thats mainly because it's geared too heavy (17/68) for a 3350 Kv.

Here's a pic of my Emaxx
http://img.photobucket.com/albums/v4...301024x768.jpg
http://img.photobucket.com/albums/v4...331024x768.jpg

Sounds liks a short in the motor. It pulled too much current and heated everything up. Do you see anything that looks like melted epoxy/resin in the motor near the windings?

There is a black residu on the windings en it smells like burned plastic. So think its a shortage. I hope I can get a warranty or something.

Yeah, the resin thats insulates the windings from themselves melted. Next time, run at medium thottle and check the temp of the motor often. If you see temps shooting up at lower throttle, you know there's something wrong. A shorted motor can possibly kill your LiPos and ESC.