Super Stock Motor Question..

bondoman2k
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"Just say GO!"

Posts: 872

Super Stock Motor Question.. May 8, 2008 4:52:46 GMT -7

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Post by bondoman2k on May 8, 2008 4:52:46 GMT -7

Well...I got a "MultiMeter" at Harbor Freight this weekend for 3.77 plus tax! What a STEAL!!

Even figured out how to USE it! LOL!! (At least for reading resistance anyway...still need to figure out how to read volts with it once I get my track put up..lol)
Ok..one more question. I read three arms..one was in an old A/FX that as far as I know, doesn't run. The other two were my SS cars. The two SS cars read 16 to 17 on the first one, and the other was pretty close to 17. On the A/FX car... I got a reading from two of the sections on the com, but one section wouldn't stop 'bouncing'. It wouldn't stop on any one reading. Does this mean the arm is bad? Could this be the reason this car doesn't run? Just curious, since everything I'm doing here is new to me, and this might help me in "troubleshooting" in the future.
Ron

Drag Racing...Because if you can turn, you're not going fast enough!

nightrider
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Posts: 673

Super Stock Motor Question.. May 8, 2008 5:34:10 GMT -7

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Post by nightrider on May 8, 2008 5:34:10 GMT -7

Ron,
As long as the point on the armature was clean when you tested it. The bouncing would indicate an "open" lobe on the armature, if you look real close at the outer edge where it is soldered to the comm plate you may even find a broken wire..
Chris

Repeat after me! "They are just little cars!"

See ya at the line..

kdog
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Kevin Petchulat, Illinois

Posts: 1,614

Super Stock Motor Question.. May 8, 2008 15:14:45 GMT -7

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Post by kdog on May 8, 2008 15:14:45 GMT -7

I am not sure what the correct awnser to your question is, but I find the same thing (the bouncing) with some of the arms I check as well. One thing I do when I get inconsistent readings is, make sure the arm is sitting on some soft nonconductive surface like a towel so it won't slide around while i'm testing it. Than retest it, you may get a totaly diffrent set of readings this way. If it still "bounces" there may be a problem. Don't throw away the arm, I had one of these that was one of the best runners ever, go figure! bottom line all these tests are just a guage to me, build it run it than decide.

johnbalich
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John Balich, California

Posts: 1,978

Super Stock Motor Question.. May 8, 2008 17:02:04 GMT -7

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Post by johnbalich on May 8, 2008 17:02:04 GMT -7

I have had "bouncers"....................if they bounce and bounce, and then settle on a number, thats the number. Likely cause is imperfect contact with the face. (remember 16 ohms is a TINY number to measure. Common impedances in electronics run into the meg ohms and more. Any way, if the bouncing NEVER stops.....(and also you said the arm doesn't run,) a likely cause is an open 'pole". (broken wire)