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Old 03-23-2007, 02:48 PM   #1
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Default Stock Motors : Overhead vs. Standard

Yes, I searched, and I am just wondering what the differences are between the spring post setup for "overhead" and "standard" are other than orientation of layout.

For those of you wondering what I'm talking about:

standard


overhead


Does one have a benefit over another in certain racing applications?

Curious on this slow friday at work.

Thanks!
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Old 03-23-2007, 03:55 PM   #2
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Hey Mits,

I have NEVER found any performance advantage to using an overhead spring. In fact it makes aligning the brushes up harder than a normal motor. The reason is that the brushes all move a little in the brush hoods when the motor is spinning. On the negative side with spring is pushing in the right direction to keep the brush from moving and being out of align. BUT on the positive side the spring is actually pushing the brush the wrong way already and then the spinning of the armature promotes this even more.

99.9% of the time it is the positive brush hood out of align when I look at a motor that doesnt dyno or run very good.

EA
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Old 03-23-2007, 04:14 PM   #3
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It is just a way for Trinity to sell more springs.
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Old 03-23-2007, 04:29 PM   #4
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Default overhead vs standard

so if you change the overhead motor back to a standard setup will be a legal motor ?
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Old 03-23-2007, 04:31 PM   #5
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Default overhead vs standard

so if you change the overhead motor back to a standard setup will it be a legal motor ?
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Old 03-23-2007, 04:34 PM   #6
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Quote:
Originally Posted by djlove85
so if you change the overhead motor back to a standard setup will it be a legal motor ?
The springs need to stay as per stock motor rules.
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Old 03-23-2007, 04:53 PM   #7
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As Mr. Chunker said according to Roar rules you can not move the spring post. A few guys asked about it at the Carpet Nats and they said NO....can not do it.

EA
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Old 03-23-2007, 06:50 PM   #8
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Quote:
Originally Posted by EAMotorsports
As Mr. Chunker said according to Roar rules you can not move the spring post. A few guys asked about it at the Carpet Nats and they said NO....can not do it.

EA
So much much for that idea!!!!!!!!!!!! Sorry Reedy Copper off-road springs....I guess you will have to go back in the plastic tote of yester-years.
Back to basic training for my stupid left thumb who still refuses to learn how to put that "new" spring on.
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Old 03-23-2007, 07:21 PM   #9
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What about motors that come this way "stock" from the motor builder, I.E., Birdman motors? Are they legal??
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Old 03-23-2007, 07:28 PM   #10
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Quote:
Originally Posted by Ffejdat
What about motors that come this way "stock" from the motor builder, I.E., Birdman motors? Are they legal??
Not for races that run Roar rules if they enforce it. Most tracks dont enforce it though.

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Old 03-23-2007, 07:30 PM   #11
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Thanks EA!
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Old 03-24-2007, 07:32 AM   #12
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EA is correct...the overhead spring actually applies pressure in the wrong direction to the postive brush, trying to cock it with the rotation instead of against it...
But, if they are all the same than no one has an advantage...yet.
Just wait until you see what's on the stock motor horizon...
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Old 03-24-2007, 11:05 AM   #13
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Birdman does this on his motors for who knows what reason.....I guess his customers have a problem finding trinity springs or something...

You can fiddle with the spring if needed, but as Todd and EA have said....the overhead design really does nothing for performance.....the only good thing it really does is allows you to solder both leads to the same side without worry of solder interfering with the spring, etc....

In the end, nothing really except a marketing tool to sell more springs...

Later EddieO
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Old 03-24-2007, 11:11 AM   #14
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No gain in performance using an Overhead Spring, however the overhead Spring is about .5oz. heavier than a Standard Spring.

So on a Standard Motor you would run say a Red Standard Spring on the Neg., and a Purple Standard Spring on the Positive.

On a Motor that requires overhead Springs you can run a Red Standard Spring on the Negative and a Red Overhead Spring on the Positive to get the same results as above..

Birdman slots the hood which is alot more work.. I didnt realize their was a shortage on overhead springs to do this extra work.. Funny I just got another 1k more of springs in and they were in stock...
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Old 03-24-2007, 11:25 AM   #15
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Quote:
Originally Posted by dgullickson
Birdman slots the hood which is alot more work..
IF they do then that is flat out cheating....by Roar rules anyway. I guess Offroad races are REALLY lax on their tech!!

EA
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