? On motors and timing.
 

So I have two different brands of motors both 21.5t. Both top out at about the same rpm. But one brand is tuned to 52 degrees of timing the other is at 43 degrees of timing. Same amp draw. Will the one with lower timing have more torque?

Great question, I’m curious to hear what people have to say. I think this might be best in the radio / electronics forum forum though.

The torque would depend on the overall build of the motor. What motors are they, what is the RPM, and what is the current draw?

What amp draw do you have them set at? I always try to do a little over 5A on a 17.5, but not sure where to start with a 21.5.

amp draw on the 53 degree motor is 6.0 and the 43 degree motor is 5.8 amps both motors are within 600 rpm of each other.

I wanted to keeps the brands out of the conversation. I was trying to cut down on the fanboy answers.

Trust me. I'm not a fan boy. I make videos about testing and comparing motors. What machine did you use to get your numbers?

It's at home but I believe it is the sky rc version. I reshimmed the motors and got the timing alot closer. The 43 degree motor is brand new and I installed ceramic bearings and titanium screws.

Which one had the biggest amp jump from being one or two degrees down? The biggest difference would be the kV. The problem with the Sky RC doesn't have a power regulator, so each motor was seeing a different voltage. Either way, it is almost impossible to tell which one has the most torque by looking at the RPM, current, and kV. Knowing the strength of the rotor would help break the tie. Also, this is the exact reason why WMH Racing made the Load Master.

One thing you could do is, run the tests while the motor is installed in your car. The car's drivetrain will add resistance. The car that has the less current draw will be the one with the most torque.

So on paper timing will not mean anything. So if thr rpm voltage and amp draw are the same they should be even. the torque is made up in the measurements on the rotor. And I think that is meessured in Gass if I remember correctly.

When comparing motors, timing is not a good way to do it. It's like having two engines with the same hp and RPM when measured on a stand. You will not be able to tell the difference in torque unless you put a load on them. It's all about how they are built, internally. Have you seen any of my videos? I have motors that have the same amperage and over a thousand RPM difference between them. However, as soon as I add a load, the difference becomes a lot smaller with the amperage also greatly changing.

Here is a video where I explain a little more about the performance differences.

Problem is that you can't know torque without actually measuring it or at least knowing the rotor strength.

And rotor diameter

I have used an EMF Meter similar to this to read rotor strength:



I physically removed the rotor and slowly rotated the rotor as close to the meter and had it lock onto the max reading.


I found disparity between rotors of the same brand and learned to cherry pick the stronger rotors using the EMF Meter ;)

Note that these cheaper EMF Meters can only read 540 sized rotors, I tried it on a 550 SCT motor and it maxed out

A strong rotor is a good place to start, but it doesn't always mean the motor will have a lot of torque. The HW G4r, I just recently tested, had a 1765 rotor. That is very strong. However, under a load, it didn't fair very well with torque.