novak hv 6.5 problem again

[honda237]

I got my motor back from novak and ran about ten packs through it and then I got this big cog when I was moving and hit full throttle and then then it started to run very slow and then stopped. I check it out and the middle wire came off the motor and so I soldered it back on and went back out and it barely moves and my lipos are charged up. and it keeps unsoldering my wires on my connectors. I love the system but it keeps breaking so fast. I was going to take it on vacations on monday. For $260 it should last more than 10 packs each time I get fixed.

 

[CharliesTheMan]

I think you're gearing is probably wrong and you're overheating the piss out of your motor. It it's hot enough to "unsolder" a connection, then you've alraedy burned something up. I'm thinking you ran really poor gearing and probably weren't monitoring your temps or you would have seen the danger zone way before it got hot enough to melt solder. So you burnt up one motor, Novak replaced it and you must have put it back in and ran the same gearing and burnt up the motor just like before.

The motor is not getting hot like that because it's a "bad motor", especially twice in a row with brand new Novak motors.

 

[abadk9420]

What charles said is a big possibilty and could have deffitnetly caused your problem, I wasn't even thinking of that because I have mine geared way low, I would call Novak first thing monday morning, it sounds like there is something seriously wrong or it is not set up right if it is getting hot enough to melt solder. I have the same system and have alot more then 10 packs run trough it, and its still going strong, hopefully they will waranty it scince you just got it back..I don't know what gearing you are running but I run a 76/10, but I am also running moab xl tires.

 

[CharliesTheMan]

honda your gearing is going to be different than his just so you know because his tires are so big. I just didn't want you to think that gearing was a definite answer and burn up another motor, which is costing novak some serious money lol.

 

[honda237]

The problem with the old motor was that the magnet came loose on the rotor so they replaced the rotor. When I got the motor back I geared it from a 17t to a 15t pinion from what the manual says for lipos. I checked my temps all of the time and by the end of the run the temp was only between 130 to 160. I hit 165 once when i did abunch of high speed passes at the end of the pack. Now the motor won't turn over when I give it gas on full battery packs. I took the motor apart and found some little chunks of wire on top of the magnet. I can spin the rotor very easily when it was together. I going to see if novak will send me a new one.

 

[CharliesTheMan]

What I'm saying is that if got hot enough to melt the solder, then it had to have gotten WAY too hot.

 

[jon2]

To heat up the solder connection, it takes somewhere in the range of 200 plus degrees. Either that, or the solder connection was done very poorly. Regardless, heat is definitely an issue here.

 

[abadk9420]

I am not sure what you are running your 6.5 hv system in but for the E Maxx Novak recomends the following as a starting point for the gearing, a 72/12 for the old version and a 68/12 for the new version with a max operating temp. of 160 - 170 degrees, these numbers were found on Novaks web site. http://www.teamnovak.com/products/brushless/hv_pro_systems/index.html

 

[honda237]

WHen the wire did come loose and I checked the motor and it was only 142. I was noticing the truck was loosing power. 12 tooth is a good starting point but in the box for the system there was a sheet about programming the new system and gearing and for 4 cell it says to run a 15 tooth on the new emaxx. I believe that what happened is that the wire came loose and then it caused something to short circuit. But I might just go buy a new motor and solder it on myself and send the motor in for them.

 

[CharliesTheMan]

Just remember that if they know you soldered it, it could void the warranty. And I'm not suggesting to lie to them, I'm just simply giving you something to keep in mind.