That’s our job as forum police. If you like we can all say “beep boop” after we dish out knowledge to the plebeians.
1 Like
Why does nobody mention 6364 motors? Could that be the sweet spot for dual?
3 Likes
I’m sure it is not all, but I have seen some pull down pictures of 6364 motors here on the forum and the stator length was the same as 6355 
1 Like
It depends on the motor. I don’t know about elsewhere but in China there’s a letter in front of the motor size N and C. N motors have longer stators compared to C. So for example a N5055 has the same stator size as a C5065
3 Likes
Yep, the forum is run by the open-source software called discourse and is written in Ruby. Feel free to write a plugin 
Then feel free to ask @onloop to use it 
1 Like
Second part is the hardest part out of the two
3 Likes
Not true. The stator on Maytechs 6365 is closer to the 74 length than the 55. And the kv produces more torque.
3 Likes
If I could fit 8074 or 8084s I would.
Forget about power in torque, and just think about copper and resistance.
Big motors, small heat. Bigger the motor the better. I love all that my Evo is, it is tuned perfect and will never overheat… Except the motors, I need more Copper and Iron.
So I guess, are 6374 worth it? Sure, but I need bigger. I’m 132lbs and can heat soak a motor really easily. Some could say my motor amps are to high, and I’d say, your acceleration is to low. Solution = bigger motors.
If I’m this light, and see issues, I can’t imagine(actually already know) what the 200lb guys are going through. I’ve pretty much made it to the point where the stuff in the enclosures are tuned perfect, cool batteries, extra aluminum mass for focboxes, no antispark to fail, waterproofed enclosure, and water proof charge connections. The electrical “system” on the decks are perfect, the drive system setup for the wheels, whether gears or belts etc, setup perfect, but the motors being the failure point.
If anything needs innovation it is the motors. I want to see 0.15 or smaller laminations, n52sh curved magnets, lower guage solid core windings, and maybe some heat pipes.
Maybe a diffuser/shroud in front of the center of the motors, So that turbulent air coming off of the board and under the deck hit the motor mount side of the motors(high pressure) and the middle behind the diffuser/shroud is low pressure so the motors actually pull air through them. Especially if a fan design like sk3 is used.
/End random thoughts
16 Likes
And this is why I picked 6374s for my first build, and I’m shooting for 6369s for my “light” commuter board.
How about a 210 lb guy with 40 lbs of groceries LoLz
even dual 5065 is perfectly adequate but dual 6355 or dual 6374 is obviously more fun
1 Like
Fixed 
LoL never groceries and dog at same time 
I am a lot lighter than you and don’t really push it while commuting (it’s a different story if I ride for fun) yet overheat dual 6355 all the time. Take a look at the metr log I posted above. Maybe where you live is a lot colder or has no hills.
1 Like
For some builds yes, i pull over 60a per vesc regularly, (120a + total) at thats at 12s! I use 6:1 ratio and Im on pneumatics so I need all the power i can get for the initial launch. I got by on one motor for a few weeks, but it wasnt nearly as fun, all i care about is acceleration, for 95% on the ride im no where near that amperage.
I live downtown so it’s mostly flat but a few hills around, some big. Typically I’m not going that way, though
2 Likes
I think you should consider swapping the dual 5065 to 6354. 6354s are actually lighter, capable of slightly more current than 5065s, and fit more easily narrower trucks (which should be lighter and less likely to bend)
I’ve run single 5065, single 6355 and dual 5055, the latter is obviously the most fun, I don’t go fast, limited to 35km/h, but the little ones handle it all, they get hot but not uncomfortable, can hold them in my hand all day long
To this day haven’t found a hill they could’t climb with 40A each and 34:14 gearing and 80mm wheels, I think 20% was the steepest so far
Two(three) buts:
1: I’m severely limited on battery amps, 30A, so the motors stay most of the time far away from the 40A limit
2: If I geared them for greater top speed I can see them getting too hot on bug hills
3: they are lighter than a dual 6355, and since my goal was to go crazy on weight reduction they are perfect
4 Likes
You should keep in mind that what the motors are “rated for” is really just a load of bullshit. Try running a 6374 motor at 3kw and tell me how long it lasts before the magnets are overheated or the phases short out due to molten enamel. I think most 6374 are really rated for 2kw at peak. and thats optimistic. Look at lets say industrial motors that are rated for at least 1kw, the size is the thing you should take note of.
@Andy87 when calculating that peak power output you can not use 4.2V per cell, it will always drop to at least 3.9 (for example with 30q or vtc6 at 15A drain per cell, for 20 it goes even lower)
I find the single 6374 with 1:5 reduction still lacking in torque on 225mm wheels, which is kinda crazy since on wet pavement I am struggling to not do a burnout on low speed, but on good dry asphalt I would want more acceleration :). With a regular longboard its probably insane.
1 Like
Just complementing, power doesn’t matter, what matter is current
There is a point you run into saturation in the core and any more current is turned to heat without increasing torque
@Deckoz have you trying lowering the motor current in small increments to see if there is any loss in performance and if the temperature drops? If you really are hitting these high currents for any significant amount of time I bet the motors are saturating, but since you ride at high speed and the battery current is way lower than the motors it could be just a high average current and the only way as you said is bigger motors
2 Likes
here’s some info from a different thread:
1 Like