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Unusual JK Hawk Retro brush alignment...


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#1 Bryan Warmack

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Posted 31 March 2015 - 12:24 AM

After last weekends SCRRA Retro race I was just checking out the brush wear on several new motors I was running and I came across this very unusual alignment of the brushes which had the brushes not fully seated in the spring seat and about 25-30 degrees out of square.......BOTH brushes!

 

RSCN1508.JPG

 

The motor is new with only one race and it's performance is nothing special but runs OK. I'm showing it here because if I was to come across it in a routine motor inspection after our Retro races with the podium cars, it would IMMEDIATELY be a red flag for me as a tech inspector it just looks like someone has tweeked the brushes to perhaps alter the timing............especially since it is both brushes!  I've never seen any brushes like this and I checked them to make sure they weren't loose but the motor is 100% totally STOCK and the brushes are just an odd anomaly from the factory. 

 

Just a little heads up as it could get awkward at the tech table if you've never seen this...........


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#2 garyvmachines

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Posted 31 March 2015 - 12:43 AM

:mosking: Remember when made in China meant something. :dash2: Got to love that quality control!!!
 
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#3 Pappy

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Posted 31 March 2015 - 04:29 AM

Remember when made in China meant something


I can remember when made in Japan meant the same thing. When I was a kid I bought a baseball made in Japan because it was cheap. I hit it about three times, the stitching broke and sawdust came out.
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#4 Bill from NH

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Posted 31 March 2015 - 06:28 AM

That's when you dug the black electrical tape out and the ball became black. Those black balls seemed more difficult to find in tall grass than the white ones.

I too recall when most Japanese made products were considered cheap junk.

Bill Fernald
 

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#5 Samiam

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Posted 31 March 2015 - 06:48 AM

I have seen a few brushes misaligned like that also. They take longer to break in but perform OK.
 
Even though they are spec'd out to suit our slot car needs, they are still 50 cent motors. My opinion is they have NO quality control. They just make 'em and ship 'em out.

Let the chips fall where they may.
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#6 A Reeder

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Posted 31 March 2015 - 10:28 AM

I have had one motor with the same misalignment on just one brush. It didn't seem to bother the performance.
 
It was just OK as far as performance goes. But it did throw a wind with less than one race on the motor.
 
The second time I have had Hawk Retro throw a wind in the last three months. :dash2:
 
The good part is I'm not building motors to race. :D
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#7 drrufo

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Posted 31 March 2015 - 10:40 AM

Bryan,

Since it appears the brushes came that way from the factory, why not just allow adjustment at the tech table and approve them? Any other adjustment would result in disqualifcation.
 
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#8 Half Fast

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Posted 31 March 2015 - 10:52 AM

How do you propose to adjust them?
 
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#9 redbackspyder

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Posted 31 March 2015 - 11:29 AM

Since it appears the brushes came that way from the factory, why not just allow adjustment at the tech table and approve them? Any other adjustment would result in disqualifcation.


John, who would be qualified to adjust the brushes at the tech table? And, if so, how would you not know that people would do this ahead of time so that they might not be looking for a timing advantage...

To me, leave well enough alone, and just note that it is a possibility... All we need is people at the tech table adjusting motors...
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#10 drrufo

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Posted 31 March 2015 - 03:22 PM

Hey, I never said it was perfect...

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#11 Dave Crevie

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Posted 31 March 2015 - 04:57 PM

Two years ago was the first time Retro Hawks were the hand-out motor at the Sano. I bought two motors, and one did not run. I took it back to Mike and he gave me another motor and told me to give the bad one to Jerry. 

 

Later in the week I took a look inside and could see that one brush appeared to be riding on the fiber washer and not on the comm. I bent a small piece of brass wire into a hook and tried to catch the spring leaf to pull it back onto the comm, but the brush just fell off the spring and down inside the motor. I suspect that any attempt to bend the spring might result in the same thing.

 

These motors are like the lottery. You pays your money and you takes your chances. But I have had a better percentage of good Retro Hawks than I did with Falcon 7s.



#12 Bryan Warmack

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Posted 31 March 2015 - 09:00 PM

  All things considered the quality and consistency of all these FK type motors is remarkable!



#13 bbr

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Posted 31 March 2015 - 09:22 PM

It gets very difficult for the 11-year-old Chinese girl to get the brushes straight after putting them in for twelve hours.  :heat:  
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#14 Phil Hackett

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Posted 01 April 2015 - 10:29 PM

It doesn't matter to the factory what is aligned: it only cares "does it run". If yes, it's good.

 

They're not concerned with our little cars and the rules we make up.


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#15 HarV Wallbanger III

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Posted 02 April 2015 - 07:36 PM

Bryan I have seen this before also..... Like Phil said ... she maybe tested it, it ran so it meets spec... ship it to those crazy Americans!
If you tried to "fix" it it would break the brush I'm sure at the finger.

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