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Motor bullet connections

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Motor bullet connections

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Old 08-05-2019, 02:28 PM
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Default Motor bullet connections

Was thinking about soldering bullet connectors to the motor and then connecting those to the ESC to make for swapping out ESC or motor faster in the future. Can anyone recommend what materials or products to use to accomplish this ?
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Old 08-05-2019, 04:29 PM
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not really worth it for competitive racing because it increases the resistance. But if you really wanted to, you could probably use 4mm bullets and 4-5mm adapters.
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Old 08-05-2019, 05:47 PM
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use 4mm..castles are always good add the extra piece of heat shrink to hold connector together in a crash or jump.. been doing this for years .no noticeable increase in resistance..
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Old 08-05-2019, 06:33 PM
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I race with cheap cage style bullets on 4S in my 8th buggy and it's fine. I've done so for years without issues. Originally I did it because my first motor came with bullets and no solder tabs so I had to use them.
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Old 08-05-2019, 07:22 PM
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How I roll since 98’
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Old 08-05-2019, 08:19 PM
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If you intent is to do quick swaps consider mounting your esc on a separate piece of carbon or something. I run touring car and I mount the receiver and esc on a single piece of carbon. If i need to do a quick swap because something broke its easy to pop all of the electronics off if there is a small gap between the deck and the esc to pry up on and I can minimize the tape i use to hold it all to the carbon deck. Its trivial but it was helpful with TC. My esc is ventilated on the bottom though (heat sinks) which minimizes how well tape bonds to the esc.

I had an issue with bad solder joints once and the leads shorted on the motor. A small 4 or 4.5 mm bullet made it easier to solder really well and they are cheap.
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Old 08-06-2019, 05:17 AM
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They're fine in my experience, the good 4mm ones are shaped like this:
https://www.aliexpress.com/item/33013235413.html
I'd ideally try find those instead of the caged ones which have less contact area.

That style of 4mm works well for 12g, 5mm works for 10g, I don't think you need any larger.
Just make sure you pre-heat and pre-tin both wire and bullet before joining, and it helps if you can clamp the parts together while you make the final join also.
As long as you take your time and have solid joints it'll work fine.

I use a super thin layer (half a drop smeared around is plenty) of CA before shrinking down the heatshrink over each finished plug, just for extra security in 1/8 buggy.
Just use normal heatshrink, don't bother with the adhesive lined stuff because that adhesive doesn't have a very high temp rating usually.
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Old 08-06-2019, 04:45 PM
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To insure that the bullets do not separate and since heat shrink tubing is rather inexpensive, heat shrink a tube over the plugged connection and when needed just remove it.
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Old 08-06-2019, 05:21 PM
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Originally Posted by Juglenaut View Post
To insure that the bullets do not separate and since heat shrink tubing is rather inexpensive, heat shrink a tube over the plugged connection and when needed just remove it.
Yes! This is what I do. It also helps prevent shorts.
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