John, I am still having a few questions about this hog. I have used it for two comps and about 6 packs total. I would say no more than an hour or so of total runtime. I have not messed with the timing or anything. It is still how you sent it to me.

Here are my questions:

• Like I have said before the motor gets hot really fast. I don't have a temp gauge, but at the last comp I had to cool it down after every run. I am running a 87/14 combo, and just put on a 12 pinion today. Just running around the carpet and setting my dig for ten minutes the motor got really hot?!
• As I was looking into the heat issue I did notice a few sparks while I was holding it and using throttle. There were noticeably more sparks in reverse?!
• I checked the comm and it is not discolored. The brushes are not discolored either. All the components have a bit of a tinge to them. Kind of like it is dirty but not.
• Then periodically it would glitch. I know it isn't the ESC/receiver/batteries/or batteries in the transmitter. Maybe everything is alright but I am concerned as I don't want to ruin a $80 motor.
• IS it normal for this motor to make a very pronounced electronics noise when power is applied? It can actually hurt my ears when I am too close. I have never heard a motor do this as much as the 7T does.

MM/BEC/7T/7+8 1500 Elites.

Can you tell me anything from what I have described?

Thanks John.

Everything sounds good, and you should be able to visually check your timing. I would suspect binding in your drivetrain somewhere, because otherwise there is nothing that sounds amiss. You should try to find a temp gun. 120f is fine. 180f is not. I advise keeping it under 160f.


first take your pinion off and see if the rig rolls 100% free. Then check your pinion mesh to be sure that it isn't too tight.


The noise from the motor is normal with a MM ESC. They are indeed loud, especially at half throttle.

Update to post two here.

On which part of the motor should we point our temp gauges?

Will the sticker do? :ror:

yep, sticker is fine. You can temp the comm too, but it will be hotter.

Hey John do you suggest any timing to the 7t or just leave it were it is?

Any brushed motor will last longer with a bit of forward timing. A few cm of rotation on the can is enough.

Added some tech, modified some pics, and added some links at end of post 2. I will continue to edit and clarify as I get time.

Is it ok to use a very light amount of compressed air to "blow out" any dust or debris in the motor?

That is toally fine, and a pretty good method as long as your compressed air does not have oil in it.

cool, thanks

timming
 

Does all brushed motors have timming marks on the can. I probably need to advance mine a bit but do not know which way to go. Please help, Oh it is a 19 turn kumoto i beleive. Thanks

They do not all have timing marks. You will rotate the endbell in the opposite direction that the motor spins.

Now will this help in heating up and for better performance. What advantage does this give (I hope i am not beating a dead horse with this question)

A very small amount of advance can keep the comm and brushes cool, but may cause the overall motor to heat up a bit more. 7* will make the brushes last longer in the forward direction, but cause more wear when braking and in reverse.

Do you mean mm instead of cm? 1 cm = ~3/8 of an inch

And yeah, I tried to PM you but you aren't accepting PM's . . . so . . .

AND - thanks for this thread - very helpful - I used to rewind industrial electrical motors - some were DC, mostly those were slip ring motors and generators - that was during the late 70's though . . . geeze, I'm old.

Yes indeed, mm is what I meant. Just a hair left or right can give some advancing.

Thank you for the props, I find electric motors very interesting. It is fun stuff.

I have never broke in a motor--but for a long time I have been running brishless. With the new MOA I am thinking it might be more critical. I ordered a pair of your HH35 turn motors john---anything special I should do--or throw them in and run them?

A five minute break in at 2 to 5v would be good. Not completely necessary, but they may last a bit longer.

I assume just run them unloaded? Thanks john "thumbsup"