I noticed that the BMC motor has holes on the cover between stator and gears. .Does anything think drilling similar holes
in the MAC would be beneficial for cooling ? Running my mac near the limits I am trying to figure out some way other then
filling it with oil to help keep it cooler or reduce cooling times between runs.
Geared hub motors: BMC vs MAC Shanghai
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Re: Geared hub motors: BMC vs MAC Shanghai
by ohzee » Tue May 29, 2012 1:58 pm
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Re: Geared hub motors: BMC vs MAC Shanghai
by neptronix » Tue May 29, 2012 2:22 pm
ohzee wrote:I noticed that the BMC motor has holes on the cover between stator and gears. .Does anything think drilling similar holes
in the MAC would be beneficial for cooling ? Running my mac near the limits I am trying to figure out some way other then
filling it with oil to help keep it cooler or reduce cooling times between runs.
The new magnet assembly in the MACs has these holes.
It might help, but it also opens up the possibility of getting grease on the stator.
You also end up shedding stator heat towards the gears.
I don't know if it's really beneficial at all. The benefit might be more in shedding weight from the motor.
ES facebook group: http://facebook.com/#!/home.php?sk=group_125035107565566&ap=1
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
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neptronix - 100 GW
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Re: Geared hub motors: BMC vs MAC Shanghai
by ohzee » Tue May 29, 2012 3:19 pm
Good point that the heat will go the wrong way. I just liked how BMC had the holes there.
Leaves me with drilling holes in the covers then. Mine is a mid kit so at least it's a bit safer from road debris.
Leaves me with drilling holes in the covers then. Mine is a mid kit so at least it's a bit safer from road debris.
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Re: Geared hub motors: BMC vs MAC Shanghai
by cal3thousand » Tue May 29, 2012 3:24 pm
All this talk makes me itch for the new 7T that's (hopefully) on the way soon from cellman
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M/C: e-BikeKit geared rear w/BB7 with 12FET 40A Infineon ebikes.ca
GM 48V LiFePO4 10Ah racked; moving to 12S Turnigy 10Ah framed
+ Speedict, XC30TK disc, Alex Adventurer 700c Disc, Tektro 180mm hyd. with 42mm Kenda Urban
#2: Norco VPS Six DH (Fun) WIP
M/C: Clyte HT3525 (Thanks Meth!!!) http://Methtek.com with Lyen 18FET 24S Regen
Battery: 24S Turnigy 10Ah frame (ABS)
#3: Wifey Bike, Giant eSuede fully customized WIP
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Re: Geared hub motors: BMC vs MAC Shanghai
by neptronix » Tue May 29, 2012 3:40 pm
Prepare to have to do regular oil changes if you do that 
.. the grease inside will get dirty over time due to dust and other stuff in the air.
cell_man seems to be working on producing a larger MAC motor soon, FYI.
.. the grease inside will get dirty over time due to dust and other stuff in the air.cell_man seems to be working on producing a larger MAC motor soon, FYI.
ES facebook group: http://facebook.com/#!/home.php?sk=group_125035107565566&ap=1
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
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Re: Geared hub motors: BMC vs MAC Shanghai
by RyanTo » Thu Jun 28, 2012 1:03 pm
Any truth to the BMC being better in the rain. Is the Mac that bad? I live in the PNW but I have covered parking at work and at home. Still, sometimes it will be raining on the way. I was thinking about buying a MAC..
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Re: Geared hub motors: BMC vs MAC Shanghai
by teklektik » Mon Jul 02, 2012 7:04 am
Talk to Ilia at Ebikes SF - he now sells both.
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Re: Geared hub motors: BMC vs MAC Shanghai
by MalcyW » Tue Dec 04, 2012 11:16 pm
Has anybody been able to compare the noise levels between a BMC and a MAC?? Are they much noisier than direct Drive hubs?
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Re: Geared hub motors: BMC vs MAC Shanghai
by DAND214 » Wed Dec 05, 2012 12:13 am
My MAC"S are as quiet as most of my DD's since they have a growl under load.
They also seem to quiet down after a feww hundred miles or less.
Both are 8t in 26" wheels running 15s LiPo's great power for such a light motor.
Dan
They also seem to quiet down after a feww hundred miles or less.
Both are 8t in 26" wheels running 15s LiPo's great power for such a light motor.
Dan
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Fill in your profile. It doesn't hurt.
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Fill in your profile. It doesn't hurt.
I know some worry about being found.
I wish someone would find me.
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Re: Geared hub motors: BMC vs MAC Shanghai
by veloman » Thu Dec 27, 2012 4:34 am
My Mac hubs are quieter than my 9c hubs. There is a slight 'whine' with the Macs, but it's less noticable than the DD noise - which is still very quiet. They are worlds quieter than that gear reduction Currie motor I used years ago 
Mush! Mush you electrons! Push harder!
Main ride: Old School Specialized Stumpjumper FSR, Clyte HT3525, 74v lifepo4, 12fet Infineon set to 26amps. And a bunch of others... viewtopic.php?f=6&t=34236&p=497325#p497325.
Main ride: Old School Specialized Stumpjumper FSR, Clyte HT3525, 74v lifepo4, 12fet Infineon set to 26amps. And a bunch of others... viewtopic.php?f=6&t=34236&p=497325#p497325.
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