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View Full Version : new Speed 600 seems kinda cheesy

aqua man
11-01-2002, 08:01 PM
Well I got my Grauper 600 BB (6311) and, well seems kinda cheap. I put it on a 6 cell battery to see how it would spool up and it sounded like a 5 year old 540. The RPM was not smooth or steady, it kind of bounced or fluttered a little. Maybe it needs some teflon shims??????? and another thing, it only has 1 ball bearing on the output end!!!!! whats up with that?? 8)
why would it only have 1 ballbearing?
should I put another one in it and add some shims while I'm in there??? Hope this thing runs better than it sounds. and feels
twmaster
11-02-2002, 12:53 AM
That opens up a good question Aqua Man. Is the 600 motor really different or is it a glorified 550 stocker?
aqua man
11-02-2002, 05:13 AM
Glorified alittle if any. Looks like a 550 to me. I'm going to disect it tonight.
MikDee
11-02-2002, 09:59 AM
Give the motor 1/2 a chance!,,, You gotta run a few batteries through it to break it in before it gets loose,,, besides I bet it has a ball bearing on each end, but you just can't see it,,, every new motor I ever had seemed "cheesy" until broken in,,, (especially the Mag May),,, but the torque on the Mag May is great!,,, just try & stop the shaft with your fingers while it's running, you'll see,,, this is what can spin a big prop on a heavy boat,,, besides you need 7cells to really get it to crank,,, with this setup (Mag May + 7cells + an X440 prop in my Jet Arrow) is faster then an N1 mono Force 21 with a P2K + 6cells + an X435 prop,,, that 19t 600 motor u got, should be even faster!
MikDee
11-02-2002, 10:03 AM
If the motor is "bouncing" or "fluttering", then you need to put capacitors on it,,,
Jay Turner
11-02-2002, 02:10 PM
The erratic running is probably due to arcing because the the very hard brushes are not broken in. I'm not personally familiar with the 600/6311, but oiling the bearing/bushing and water-dipping the brushes should wake it up. It is designed for 6 cell use, although 'overdriving' it with 7 cells should not hurt. The one BB Graupner motor I had only had a bearing on the PTO end.

To break in the brushes, connect the motor to a pack ( not a power supply! ) and dip the brush end into a cup of water for a couple of seconds. Don't overdo it, but sometimes it takes 10 to 25 seconds to fully break in the brushes. The water will turn slightly cloudy as the brushes conform to the comm. This is the biggest thing you can do to a sealed can motor to improve its performance - short of opening it and changing the timing. Dry it completely and oil the bearings. It's specs are better than the typical RE550; on 6 cells the 600's maximum power is at 11,800 rpm and 36 amps. Prop accordingly.
aqua man
11-02-2002, 08:23 PM
Well I proceded with operation BIG WET DUNK to break in the brushes and it sounds marginally better. I can't leave well enough alone, so apart it came. Took some pics for anyone that is interested. Picture #1 shows it is a 16turn arm -- I was surprised. I can also confirm that it only has 1 bearing in the output end so I will replace the bushing on the comm end. thinking about adding brush coolers too. Picture #2&3 shows a slight amount of room to advance/retard timing. Anyone know wich way I should go or is this even a good idea? I'll have to file notches in the endbell but thats no biggy. Will be running this motor on 8 cells for sure.
aqua man
11-02-2002, 08:24 PM
timing
aqua man
11-02-2002, 08:25 PM
timing 2
Jay Turner
11-03-2002, 02:17 PM
I don't know the initial timing, but for better performance you'll need to advance it. That means turning the endbell in the opposite direction that the armature spins. How much advance? Depends on how many amps you are drawing. On 8 cells that will be a bunch if you use a large prop.....
Jeff Wohlt
11-04-2002, 04:39 PM
I thought the 6311 was the 600 7.2 SP racing motor but it has end brushes and runs better than any of the other 600 motors.

I know one guy that has one and he was not pleased until it got broken in and now he is happy running it on 8 cells.
Jeff Wohlt
11-04-2002, 04:43 PM
Just checked the motor number and yes...6311 is the SP but the pics you showed does not have the brushes on the endbell.

The 7.2 SP puts out aver 3,000 rpm per volt. The 8.4 version is closer to 2100 per volt.

Is this the one you have? Most of the cans I have seen were black.
MikDee
11-05-2002, 02:35 PM
Regarding (1 jpeg) Look at the size of that arm!,,, it's massive, it should have the torque of a tractor!,,,