MMM v2 Success / Failure Poll - Page 13 - RC-Monster Forums

09.30.2008, 03:21 PM

Quote:

Originally Posted by brushlessboy16

could it be the moisture in the air from all the rain, since the fan is swirling it all around in there?

I did some more diag last night. It turns on and in a few seconds the lights start to fade and dim...then it's off. I'll bet it's classic BEC failure. Besides, if the moist air was the culprit all the other guys running MMMs should have also had failures...

Can't wait for v3!

killajb · 03:09 PM

My stock MMM V2 went poof today. Minor poof, more like a bec failure rather than a violent meltdown. BrianG, can you please change my vote to reflect this?

Arct1k · 09.30.2008, 03:55 PM

Dave - Mine died that day to on my buggy - My bec leads broke just before the 2nd heat so I had to revert to the MMM bec.

It survived everything including the long jump and then died coasting around the track. I'm with Jeff on mechanical stress of the fan connector pushing into the brain board. Even with my cutout there is a clear indent on the foam I had in the insert of the cutout (if that makes sense)

e-mike · 09.30.2008, 03:59 PM

i dont know what happen ...some of my post are deleted...anyway my third v2 come in flame deadly(after 5 min).....very scary thing....

09.30.2008, 04:05 PM

Mine is at 45 hours and counting! Here's hoping it stays that way.

RBMike · 09.30.2008, 04:36 PM

Quote:

Originally Posted by DickyT

Mine is at 45 hours and counting! Here's hoping it stays that way.

What is your set up?

09.30.2008, 04:40 PM

Quote:

Originally Posted by RBMike

What is your set up?

converted 3.3 revo, rc-m diffs, locked into 2nd wide ratio tranny, 17/36 pinion/spur.

neu 1515 1y, MMM (unmodded), 4s trc 8000 mah lipo and 4s neupower 5000 mah 25c lipo.

The power switch broke on sunday though, just cut it off and twisted the 2 leads together.

DRIFT_BUGGY · 09.30.2008, 05:24 PM

Quote:

Originally Posted by DickyT

Mine is at 45 hours and counting! Here's hoping it stays that way.

Far out, way to go

JesseV · 10:33 AM

I voted the last option. :/

http://farm4.static.flickr.com/3055/...0b26a00b_b.jpg

It worked fine few 4S 5Ah battery runs in my brushless modded Hpi mt2. But then I put it to Inferno and during about 2nd lap on track it started flaming. :) I guess it wanted to smoke too because all the other cars on the track were smoking. Friend on a track went to save rest of the car luckily before anything else burned.

Sent the MMM to Castle on monday, from Finland. And while waiting, im gonna try some cheapo China ESC.

EDIT: Setup was 4S 5Ah Zippy lipo, MMM, 3000kV L-sized china motor, 13/52 pinion/spur. Engine temp was about 40C, battery was a bit warmed up, prolly because of the short circuit. Never got hot with that setup on Mt2.

BrianG · 10.01.2008, 10:38 AM

You obviously have a V2 from the pic. Just curious, is there a chance that the motor and/or power bullet connectors touched the heatsink?

JesseV · 10.01.2008, 10:43 AM

Quote:

Originally Posted by BrianG

You obviously have a V2 from the pic. Just curious, is there a chance that the motor and/or power bullet connectors touched the heatsink?

Yes V2 it was. I didnt open it so im not sure if they touched. But just looked at Lutach's pics and i guess they touch normally. Weird.

BrianG · 10.01.2008, 10:46 AM

Hmm, wonder if the bullet connectors is the cause of V2 flames? V1's don't seem to have nearly the same number of catastrophic failures and they used wire instead of bullets...

JesseV · 10.01.2008, 10:50 AM

Quote:

Originally Posted by BrianG

Hmm, wonder if the bullet connectors is the cause of V2 flames? V1's don't seem to have nearly the same number of catastrophic failures and they used wire instead of bullets...

Wouldn't wonder if thats the problem. :| Lots of jumping with the car and rough driving, maybe the paint from the heatsink wears out -> short circuit.

When i get new one from Castle, im pretty sure i'll open it and mod the heatsink. Tho its kinda expensive part to lose warranty. :( And there might be other problems with it too, still could break.

BrianG · 10.01.2008, 10:56 AM

Personally, instead of modding the heatsink, I would just remove the connectors and solder the wires directly to the PCB...

Arct1k · 10.01.2008, 11:03 AM

I think on the V3 thread it was mentioned that the cups are going on the battery side which will allow them to provide more clearance for the heatsink on the motor side.

I would imagine the motor side won't change as the pics of teh CC motors show long leads with buid in connectors.