Kraton Motor shaft bent/replacement recommend

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Powertuners

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Arrma RC's
  1. Talion
So had the whole family out bashing today and I chewed up a RR hardened pinion . Got home and found the shaft on the motor is bent. After installing a new pinion and couldn't set gear mesh correctly. I checked my sons truck as it is just as old and used as mine and found his is bent as well gear mesh was tight on just side of pinion. Not enough to chew the pinion up but you can tell it just started. What would cause this? Both ran on 4S only temps checked 3 times during runs and never over 150F. Usually around 142F to 145F. Gear mesh is checked and never tight. We don't bash crazy mainly Grass with visit to a construction site here and there. I was going to call horizon and see if they will warranty the motors.

Since I don't want to wait for a motor that long if they do warranty it so whats a good recommendation for a motor to use with the stock ESC or motor esc combo I could pickup at my LHS. They carry Castle and Hobbywing and Tekin systems. We only run 4S never will run 6. I am fine with the power that the stock system on a 15T pinion gives. A little more torque at the same speed would be nice but not required. Water proof not required either. Thanks in advance.
 
How about this setup?
 

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Which motor is that? The 1515 is a good match for the Kraton, the 1512 is more of a buggy motor. Also, with the higher KV, watch your temps, you may need to drop the pinion a tooth or three.

Another option, just get a hobbywing motor. But with the LHS, half the battle is often finding something in stock. I don't think my LHS has a single 1/8 size motor. :(
 
Jerry-rigged said:
Which motor is that? The 1515 is a good match for the Kraton, the 1512 is more of a buggy motor. Also, with the higher KV, watch your temps, you may need to drop the pinion a tooth or three.

Another option, just get a hobbywing motor. But with the LHS, half the battle is often finding something in stock. I don't think my LHS has a single 1/8 size motor. :(
Click to expand...

Whats the difference from the stock motor 2050kv and the castle creations 2200kv? I would like to keep the 15T pinion and only going to use 4S. Stock motor was perfectly fine for us just want a more reliable motor. I have never had a Motor shaft bend like that before. Still have no idea how that happened. Esspically 2 motors same day.
 
The Castle motor has a bit more power, and will want to rev a bit higher = more speed. I'd say get a thermometer, and watch the temps. Finger to the motor is not a reliable way to track motor temp, you will burn your finger on a motor that is still "safe". 130f = scalding, 150 will leave minor burns, motor is ok up to about 170f.

Here is one I use -
https://www.harborfreight.com/non-contact-pocket-thermometer-93983.html
 
I'd recommend a Hobbywing Max 8 Combo with the 2200kv, pretty popular combo.

I run it in my MT410 and it is a beast.

TT
 
Jerry-rigged said:
The Castle motor has a bit more power, and will want to rev a bit higher = more speed. I'd say get a thermometer, and watch the temps. Finger to the motor is not a reliable way to track motor temp, you will burn your finger on a motor that is still "safe". 130f = scalding, 150 will leave minor burns, motor is ok up to about 170f.

Here is one I use -
https://www.harborfreight.com/non-contact-pocket-thermometer-93983.html
Click to expand...

So would it be better to just go with a 2000kv motor? Hate to have to buy more pinions at $10 a piece when I already have 3- 15T and 3- 14T now.

I have a temp gauge always checking never over 150F is where I like to keep them. I have a old Gen 1 Tekin motor 8.5T in my 22T and it runs perfect. Granted its never been bashed but been on the truck since and tons of racing.
 
So lower KV means less torque runs cooler and have to gear up for speed?

Higher KV means more torque and gear down to keep temps down?

Is this right?
 
Powertuners said:
So lower KV means less torque runs cooler and have to gear up for speed?

Higher KV means more torque and gear down to keep temps down?

Is this right?
Click to expand...

Kv is the number of revolutions per minute that the motor will turn when 1V is applied with no load attached to the motor. The higher the Kv the more speed given the same volts. I don't think there is a big correlation to torque. All I know is the more volts you want to run, the lower the Kv should be. And on top of all that, you have gearing.
 
Assuming all aspects are the same, the lower the KV, the more torque you will have and the higher the KV, the faster the motor will rev. A lot of people use a lower KV motor and gear it higher to "convert" the torque into speed while keeping the motor cooler and more efficient. The lower KV is like a diesel engine and the higher KV motor is like a Ferrari engine. With proper gearing, both can create monster acceleration, but the Ferrari engine will spend more of it's time in the higher rpms, creating more heat.
 
Rule of thumb for efficiency

4s = 2200kv
5s = 2000kv
6s = 1800kv or lower


Buy a $12 thermal gun check temps,, regear as needed,, pinions are cheap.
 
So i decided to wait and just bought 2 stock motors to put in mine and my sons talion from a RC chop shop. Kid really wanted to bash this weekend and who am i to say no lol.

Plans are to get the Hobbywing Max 8 and a Leopard 4282 2000kv motor. This will keep me right where im at stock and add alittle more torque for grass bashing with the kid. Might just get 3 and install into the wifes Kraton as well. Anyone use the that motor any reviews? Or should i just stick with the Hobbywing 2200kv motor. Temps are always good for what we do with 15T 4S
 
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