14x2 motor (almost) melts 1400Nicd?

[akemag]

First i must thank all you here at the forum for replying to my posts[^]. Anyway, my Bush Devil that i bought and only run a couple of times to test it, came with an old ESC and a 14x2 motor. It had some strange wiring on some cables from the ESC with some tape around it.[?] Maybe it´s nothing wrong with it but it wasnt especially fast i think. With a 14x2 motor shouldnt it be quite fast? It came with a NiMh 3000Mah that i didnt use. I tried my trusty 1400Nicd. It emptied it in perhaps 3 minutes and it showed signs of melting in the plastic wrapping around the battery. Guess it became very hot. Could the lack of speed be that i used a 1400Nicd. The fact that it became so hot maybe was because i emptied it so fast. Or was it the old Hitec (i think) ESC thats improperly wired. What do you experienced people out there think.

[sosidge]

Bad wiring can definitely be a cause of overheating, because it creates lots of extra unnecessary resistance.

And if the previous owner was messy with wiring, he may have been messy at maintaining the drivetrain as well, in which case there may be a lot of extra friction there too - especially if it is still running on plastic bushings.

To be honest, a 14x2 is a bit too much motor for a car like the Bush Devil, it's hard to get the right gearing for it with those big wheels, so that could be part of the problem too.

[akemag]

Thanx for the fast reply!

Do you think that a LeMans 480T that came with a MB i bought could be a better choice if its working properly? A decent runningtime would be nice too of cource. Could allways get a standard silvercane if all else fails[V]

[Tipsy]

The Lemans 480T should be a good choice. The 480 was meant to be the run time back when 1200mah batteries were the norm. Also the T was for Torque. Cant remember what turn motor it is, but should be about a 23T.

[minijosh]

If you are going to be running hot motors like that, you should change your battery connections. The tamiya plugs are good for old motors and batteries but if you step into the new scene, you will be getting 3600 batts soon. Those will really hurt your stock battery connectors and melt them with a hot motor like that. Too much power wasted away that could have gone into your motor to go faster. I run power poles. Red for positive, black for negitive. You have to solder them yourself. Not too hard, just buy a cheap soldering iron and your are there.

[akemag]

Ok...Think i´m gonna change to the LeMans480. Feels like 14x2 is a bit to much for me! And i dont want to break the Bush Devil. Thanks for the advice[^]

[Neil_S2000]

The gauge of wire you have on the connectors can make a difference, if you're using a motor with a high power drain the resistance can cause a lot of heat build up.

[TamiyaDan]

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[Gixer Jay]

Running motors that HOT ( 15 turn or under ) will cause a lot of heat if your using the stock wires and strain the battery also. Just think of your wires as a garden hose and your motor is trying to suck a orange through that hose. TO MUCH STRAIN = HEAT!!

Rule: Running motors of 19turn or under run 12 gauge wire. 20turn or above you can run the small thinner wire.

Rule 2: Always make sure the speedo and the speedo FETs can handle the amperage draw from those low-turn motors.

Hope that helps.

[akemag]

OK! It´s a lot more to think about than just adding a hotter motor it seems. Thanks you all for the advices!!!

[raemin]

In the early nineties, when trinity launched their 9 turn tripple monster horse power, they made all they could to reduce excessive drain on the electric : Serrated brushes (surface with the com is reduced), soft springs (the gold ones are approx 90 deg) instead of the current 150°. At the end of the day, the engine gave less torque but an impressive rpm and can be operated with nowadays 15 turn esc.

If you really want to use this 14turn engine, just do it this way, but performance wise it will be quite disapointing and a properly setup le mans 480 with new brushes (soft) and springs (135 - 150°)would offer much better results. Alternatively a 240ST would also be a good choice (21 turn).

finally, if the previous owner did really run this car with the 14 turn engine and inadequate gearing, chances are that the brushes and com were "cooked" prety hard, which would explain the strange overheating. Try the car in a flat surface were you will not require high torque. If your engine is converted into a toaster after a few runs, then it might need to be trued (ask your lhs).

Raoul