[kerrymann]

I have several exceptions to conclusions drawn from that test but that is another subject. I was looking at going with the split-tops a while back for my ADC-FB4001 because I wanted to go to the higher voltage levels. One thing to keep in mind that the warp 9 doesn't just have the better brushes it also has a better brush holders. On my 9" ADC, the brushes are perpendicular to the comm but the Warp is angled, presumably to increase contact area and better brush wear. The point is, would just changing the brushes alone on a ADC will get you the same advantages as a brush upgrade on a W9?

[ndplume]

KM,
There are 2 ADC 9s in our club, have you seen a group buy, want to start one?
I emailed Jack and the W9 brushes are not compatible with the FB4001 brushes.

Did you watch the split brush video. It looks like the 1/2 width brush rubbing across the the commutator reduces the vertical movement when going from bar to bar. Also the dual bars with the rubber top seem to act like shock absorbers.

[kerrymann]

Originally Posted by ndplume

KM,
There are 2 ADC 9s in our club, have you seen a group buy, want to start one?
I emailed Jack and the W9 brushes are not compatible with the FB4001 brushes.

Did you watch the split brush video. It looks like the 1/2 width brush rubbing across the the commutator reduces the vertical movement when going from bar to bar. Also the dual bars with the rubber top seem to act like shock absorbers.

I am interested in the 9" brush group buy but would like to hear from some the motor experts. I have no doubt that the red tops are a superior brush but when I contacted helwig back in feb. the first question was if I want to upgrade the brush holder. My plan has been to drive the ADC for now and then upgrade to a W9 (or something else) this winter but if just a brush upgrade gets me what I want...

[ruckus]

I have talked with Hellwig extensively about brushes and the brush holder.

They say that a certain amount of force is required for optimal brush contact. The stock springs do a fraction of this. If you crank up the springs then the whole brush holder begins to deform and bend. Also, the brush holder shifts around as motor temperature changes. They are not impressed.

Conveniently, they sell a replacement brush holder that solves these issues. Unfortunately, it is crazy expensive.

There is very little difference between the ADC 9" and Warp 9". Definitely not enough to warrant a swap (edit: I was told this, but who really knows until somebody tries it..). The best value is to just upgrade the brushes using the stock holder and springs.

Cheers

[kerrymann]

Originally Posted by ruckus

I have talked with Hellwig extensively about brushes and the brush holder.

They say that a certain amount of force is required for optimal brush contact. The stock springs do a fraction of this. If you crank up the springs then the whole brush holder begins to deform and bend. Also, the brush holder shifts around as motor temperature changes. They are not impressed.

Conveniently, they sell a replacement brush holder that solves these issues. Unfortunately, it is crazy expensive.

There is very little difference between the ADC 9" and Warp 9". Definitely not enough to warrant a swap. The best value is to just upgrade the brushes using the stock holder and springs.

Cheers

Thanks for the input. I had been talking with Terry and the holder price scared me off from that idea too. I wonder if you did really want to upgrade the holder you could try to fit a W9 holder and brushes in to the ADC? The W9 has other upgrades such as the higher flow fan but that also be assisted with an separate blower.

When and how much for the 9" group buy?

[ruckus]

Originally Posted by kerrymann

When and how much for the 9" group buy?

I don't think there is one. You would have to get a quote from Hellwig.

Is there a possibility they use the same brush? It would be nice if all the ADC folks could buy together (although the radius would be different).

Anybody have exact measurements of the 9" ADC brushes?

[kerrymann]

Originally Posted by ruckus

I don't think there is one. You would have to get a quote from Hellwig.

Is there a possibility they use the same brush? It would be nice if all the ADC folks could buy together (although the radius would be different).

Anybody have exact measurements of the 9" ADC brushes?

Sorry I realized I hijacked your thread with 9" discussion. When I get back state side I will pull a brush and measure them.

[ruckus]

Any stragglers? This deal is coming to a close.

Thanks to those who are participating. We achieved almost half-price!

I will contact the purchaser's privately...

Cheers

[octagondd]

Originally Posted by ruckus

The fact that I get little response suggests that those 8" motors are out there working fine. Where are the stories of failure? Isn't it the 9 and 11" fancy pancy Netgain motors that are going "boom"?

Please respond if you have something positive to say.

What I have found is that on this board in particular, once a conversion is finished, people do not check the board too often. You would probably need to contact those with 8" motors directly to get a better result.

Dave

[ruckus]

You are correct. I thought about going through evalbum and contacting the 8" motor owners, but it just wasn't worth the time for another couple bucks off. As is, we saved about 45% and will pay about $100 less than those who buy from Netgain or EVtv. Well worth the small effort to work together.

If EV builders all banded together we could get crazy deals on every component. Unfortunately, the cooperative spirit is not nurtured in a cut-throat capitalist society.

Cheers