9920 too hot
 

Well after having nothing but good luck it would apear bad luck has found me. My 9920 is getting hot (150+) after just a couple of minutes of running. Previously I've never had it above 125 even after hard speed runs and 20 minutes. I've check everything imaginable, wiring, driveline, gear mesh, etc. The motor and batts are still very cool 110F and 75F respectfully, which is where they always ran. I'm at a loss to what could have happened but I noticed one capacitor is deffinetly hotter than the other. If I'm missing something let me know other wise I'll be e-mailing Mike to see what I should do. The esc only has about 6 runs on it so it's dissapointing to have this happen so soon.

have you changed body or something? Maybe move the esc to another spot. What gearing and motor cell count to?

Have you had a change in outside temp over the last few days

I've changed nothing, gearing 14/51 with 5s lipos with an 8XL. Outdoor temps around 50. I can't figure it out maybe I'll shoot Mike an e-mail and see what he says. I think tomorrow I'll peel all the shrink wrap off and see what the PCB looks like. I've had all I can take for one day...... This is suppose to be fun.:frown:

Is it possible the 8XL is pulling too much current for the 9920 to handle consistently and damaged one or more components forcing others to work harder?

I suppose that is possible but I find it hard to believe that would be the case since most people on the forum here said this setup would work fine and should not be a problem for the 9920. When I get to it tomorrow I'll take a closer look at the esc and see if there any discoloration on the pcb or components.

Are you by chance using the built-in BEC? If a servo or something is drawing more current for whatever reason, it will heat the regulator pretty quick on that small heatsink.

[offtopic]: Wow, I didn't know there was a Des Moines in WA. And now that I checked, there is one in NM, and CA as well. I learned something new today. :)

The 9920 on that gearing should run a 7xl. I don't see a problem yet in the setup. Unless you was running some big huge massive tires like jumbo kongs or something.

Maybe there was a short? or not... your problem could be the motor pulling a bit too much amps.

Well I got back after it this morning and see nothing wrong with the esc. The pcb and all its components look clean and undamaged. So I hooked up the batts and took it for another spin to see if the magic elf fixed it over night. No luck, after a couple of spins up and down the street she was glitching again and getting hot. The thing is it is hot at the spot where the negative lead terminates to the pcb and that capacitor is also heating up pretty fast. The heat sink and rest of the esc are in the 60's on the heat gun.

I've got another problem that has come to light. The motor is making a sound like gears striping. When I put my foot in front of the truck and hit the gas I get no power to the wheels just an awful gear striping sound and it definitely is not in the tranny or drive-line. I get my ear down there and it's coming from the motor. At first I thought the pinion was striped or something but the shaft showed no signs of that. So I've taken the motor off and give the shaft a good spin and it spins real clean feeling no weired grinding feeling or anything. I don't see anyway to get a look at the inside of the motor so I'm not sure what to try next. Is it possible there is a short inside the motor?

Btw, I'm using a UBEC and standard size tires nothing monster anything like that.

DesMoines, WA is a small suburb 10 miles south of Seattle.

You can pop the rear endbell off the 8xl pretty easy. Take the pinion off and tap the motor on the shaft on some wood or so.it won't take much. It may be your magnet has come loose on the shaft.

Hmm.... that sounds very weird... somthing in the controller may be doing it no good.

To look inside the motor you have to pop off the rear endbell. I dont think there is a short IN the motor, it could be 2 of the 3 wires touching though.

I may have found the culprit. It appears one of the motor leads has cracked or peeled away the casing and exposed wires and possibly grounding to the can. What do you think. Can it be fixed? Do you think this is the problem?

That could be the problem, it can be fixed, you can use electrical tape to cover that up.

I'd go for heatshrink over electrical tape.

Not everyone has shrink lying around...

I'm with Sneek about the tape. It gets too messy after a while, especially near a warm motor. Heatshrink is not expensive and can be picked up a RadioShack even.

Once you do re-insulate that wire, I would measure the resistance from the can to each wire and make sure there is no continuity. And Sylvester, I know not everyone has a meter laying around. ;)

Fortunatly, i do:P

Thanks everyone, I've got the end bell off and noticed the other motor leads are also wearing thin right at the edge of the motor can. The problem here is the wires are epoxied together and to the can before they exit the can. This makes it almost impossible to get the shrink tubing over the break in the casing. IMO this is poor workmanship and the casing of the wire is so thin with the heat and laying right on the edge of the can just a little bit of movment starts to cut through the casing causing problems. Also there is not much room to add additional shrink wrapping due to the small opening in the end bell. I'm going to give it a try but I'm not real hopeful at this point. Then I'll check resistance tomorrow when I can borrow a meter. For future reference I would recomend that people not wiggle those motor leads around very much as this certinly can compond the problem. Thanks.

Good to hear you found the problem. Sux that that happened:(

Yeah, good and bad. You won't believe what happened now. That bushing that goes on the inside between the magnets and the end bell. It slid right off the shaft, bounce on the floor and headed off to never never find land. I've spent two hours crawling around my shop with a search light trying to find it. :mad:1 Anyone know if it's possible to get another bushing for an 8XL? Man when it rains it pours. In the mean time I'll be in my shop crawling around looking for the bushing. :035:

I had a couple laying around here. I don't know if I can find them now but they here. IF not luck let me know.

Damn man that sucks large! I hope you find that bushing.

I didnt think that you could fix something like that on a BL motor. I thought that the windings have an insulator and when the insulator shorts out thats it (thats why i support my wires where they enter the speed controller and the motor). I had that problem with an old lehner motor and she had to be put out to pasture. Good luck with it anyways, hope its a simple fix..

What about a couple carefully applied layers of PlastiDip painted on?

That may be my only option. Now if I could just find that bushing. :mad:1 :mad:1

You still havent found it? MAN, i wish i had one to send you, but i dont:(

Which one you lost?(big or small)

I can give you the exact measurement so you can look for some copper tubing with an inside diameter of 5mm. So you can make you own.

Maybe mike can get you 1?

Yeah, I e-mailed Mike with some pictures and explained my dilemma. Hopefully he can help. I just have to wait and see.

Sneeck, I'm not sure if it's the big or small I did not get a real good look at it before it slid off. It appears to be the only one on the bell end (where the motor leads come out) on the warrior 8xl.

I even got so desperate I had to swallow my pride and ask the wife to help :rolleyes: cause she always seems to find things I loose but she was not successful either. :dft004:

The small one you lost is 5,50 mm, the big one is 7,52 mm. These spacer's come out of a 9l though.

I shot an e-mail off to BK today. Hopefully they can give me a definite answer. Mike says he's pretty sure he has one laying around. Thanks for the help, I'll let you know what I hear.

I have one to some where. I have to try to locate it. Not sure where to start to look for it. This box that box can somewhere here.

If you can't find it on the floor it's time to look everywhere else. I have had things fall and I remember it falling to the floor and when I gave up and went back to messing around on the table "BAM'' there it was. I have even found things in my shirt pocket after going crazy trying to find it. Hope you find it.

I had parts fall off of mine and manage to get stuck on the tread of my tires... of all places...sheeesh.

It wasn't until frustrated I went to put it away that it fell onto the table.