Search found 167 matches

by fourbanger
Oct 05 2019 1:18pm
Forum: General Discussion
Topic: Active energy transfer balancing
Replies: 14
Views: 853

Re: Active energy transfer balancing

If by now you mean no then I think yes.

Wow. That was a weird sentence.
by fourbanger
Oct 05 2019 12:12am
Forum: General Discussion
Topic: Active energy transfer balancing
Replies: 14
Views: 853

Re: Active energy transfer balancing

Inwo, thank you for offering your expertise on this matter. Before this thread grows too old, I'd like to ask your opinion of the super cheap active balance boards such as this. HTB1EwRgTq6qK1RjSZFmq6x0PFXas.jpg_220x220q90.jpg Are they any good at all or not even worth the fiberglass they're printed...
by fourbanger
Jul 16 2019 10:04am
Forum: Items for Sale - Used
Topic: SOLD! Used Tidalforce 26" Front Battery Hubs
Replies: 1
Views: 299

Re: Used Tidalforce 26" Front Battery Hubs

If someone could redesign these to run 20700s they could own the universe.
by fourbanger
Jul 01 2019 4:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: Converting a hubmotor to a middrivemotor
Replies: 988
Views: 188464

Re: Converting a hubmotor to a middrivemotor

Hey, thank you for that offer. I'll have to get back to you on that, or you can give it to someone else who really wants it. I'm afraid I have at least one too many projects on the go already (honestly, probably like five too many) including a code 16 that I've re-terminated to delta that I'm still ...
by fourbanger
Jun 27 2019 12:12pm
Forum: E-Bike Non-hub Motor Drives
Topic: Converting a hubmotor to a middrivemotor
Replies: 988
Views: 188464

Re: Converting a hubmotor to a middrivemotor

I'm not entirely sure I agree with that statement about the BBSHD. The best thing about this conversion (as far as I'm concerned) is that it lets you pedal along at high speeds without spinning out whereas most other mid-drive setups--including the Bafang--will not allow for that. Also, I'm pretty s...
by fourbanger
May 19 2019 1:24am
Forum: E-Bike General Discussion
Topic: Bafang Bpm, how many RPM?
Replies: 126
Views: 40904

Re: Bafang Bpm, how many RPM?

That's a good question, I'd rather like to know myself; It's like a smaller BPM. I wonder how many RPM it can be pushed to until back EMF starts hurting.

BTW, where did you get that particular motor from?
by fourbanger
Feb 16 2019 8:07pm
Forum: E-Bike Technical
Topic: Mini Cyclone Motor RPM
Replies: 8
Views: 385

Re: Mini Cyclone Motor RPM

Well OK. But if we all somehow get sucked into a black hole or something I'm gonna be pissed.
by fourbanger
Feb 16 2019 5:33pm
Forum: E-Bike Technical
Topic: Mini Cyclone Motor RPM
Replies: 8
Views: 385

Re: Mini Cyclone Motor RPM

Right I got that bit and to be perfectly honest I have ZERO experience with these motors, so for all I know the thing really could be screaming its guts out at 8k+ rpm, but that just doesn't sound right to me. What I'm saying is that, hypothetically, if you had a 44/44t crankset with one chainring b...
by fourbanger
Feb 16 2019 1:20am
Forum: E-Bike Technical
Topic: Mini Cyclone Motor RPM
Replies: 8
Views: 385

Re: Mini Cyclone Motor RPM

No, you must have dilated the space/time continuum somehow. I keep telling people to be more careful with their cellphones. No one listens. If you had, say, a 44t chainring driving an 11t rear sprocket at a ratio of 1 to 4, a 268 rpm at the cranks would net you 1072 rpm at the wheel which would be l...
by fourbanger
Feb 16 2019 12:58am
Forum: E-Bike Technical
Topic: Best solder for shortening cables? (PAS, Motor etc)
Replies: 20
Views: 889

Re: Best solder for shortening cables? (PAS, Motor etc)

That seems like a fairly astute appraisal. Interesting point about thermal mass. I put together a battery pack a while back using a 100 watt soldering iron with a pretty sizable chisel tip and while it went alright I kind of felt like another 40 or so watts of heat would have been nice. Having said ...
by fourbanger
Feb 15 2019 9:40pm
Forum: E-Bike Technical
Topic: Best solder for shortening cables? (PAS, Motor etc)
Replies: 20
Views: 889

Re: Best solder for shortening cables? (PAS, Motor etc)

That right there is some good advice that I was previously completely ignorant of. Thanks izeman. +1 on staying away from cheap ebay solder. I want my $2.49 back. Don't know why you need to source out your solder on amazon though; just pop into her majesty's radioshack or whatever have you. It's not...
by fourbanger
Dec 10 2018 12:40am
Forum: E-Bike Build Threads / Photos & Video
Topic: Pack build: Sewer Pipe Dynamite Roll
Replies: 2
Views: 530

Re: Pack build: Sewer Pipe Dynamite Roll

Check this out. I originally tried for a different, more friendly six pack configuration, but this is the shape the cells wanted to go for. flower-consciousness copy 19 circles.jpg cci19.gif And this poor bastard has it all figured out... http://hydra.nat.uni-magdeburg.de/packing/cci/cci19.html
by fourbanger
Dec 08 2018 3:12pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Pack build: Sewer Pipe Dynamite Roll
Replies: 2
Views: 530

Pack build: Sewer Pipe Dynamite Roll

Well, for my first pack build I thought I'd make things as difficult as possible for myself so I decided to go with a cylindrical pack using a 4" PVC pipe as a container. Wow. Ok, here goes... IMG_0256.JPG After scratching the terminals with some medium grit, applying the insulation ring around the ...
by fourbanger
Sep 16 2018 10:33pm
Forum: E-Bike Technical
Topic: Sensored or sensorless controllers?
Replies: 18
Views: 2412

Re: Sensored or sensorless controllers?

Holy cow. Pretty good turn around time on the replies for a 6 year old thread, guys. Thanks. One thing I'm a little unsure of now is whether or not a person can run a hub motor backwards at full speed (perhaps using the freewheel side of a DD motor to drive the LEFT side of the rear wheel, for examp...
by fourbanger
Sep 15 2018 11:55am
Forum: E-Bike Technical
Topic: Sensored or sensorless controllers?
Replies: 18
Views: 2412

Re: Sensored or sensorless controllers?

It was actually my understanding that sensorless motors *needed* to have a bit of rolling momentum before throttle could be applied. As such, I'm kind of at a loss as to how a geared hub motor with an internal freewheel can operate sensorless at all...
by fourbanger
Aug 25 2018 10:22pm
Forum: E-Bike Build Threads / Photos & Video
Topic: The Mid Drive Hub Motor Media Group
Replies: 124
Views: 48531

Re: The Mid Drive Hub Motor Media Group

That's pretty wicked. I've been thinking of something along the same lines for some time.. I like how you didn't have to drill all the way through the side plate to get everything locked in place. Looks like you've got enough axle left that you could fit one of those dinky 12t freewheels so you coul...
by fourbanger
Jul 28 2018 7:40pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dome Motors 600W mid drive kit
Replies: 13
Views: 2077

Re: Dome Motors 600W mid drive kit

Groovy. Looking forward to it!
by fourbanger
Jul 28 2018 2:19am
Forum: General Discussion
Topic: how much regen is too much for the battery
Replies: 46
Views: 2014

Re: how much regen is too much for the battery

I still myself attracted to the idea of a mid drive setup with a DD hub in back to be used as a "coaster brake", particularly on long descents when heavily laden. The amount of current to the battery could be regulated by a rheostat and a big ass resistor if needed.

???
by fourbanger
Jul 27 2018 1:30pm
Forum: E-Bike General Discussion
Topic: Mystery Bafang Motor.
Replies: 9
Views: 584

Re: Mystery Bafang Motor.

Better tell your friends, then. The MOQ is 20.
by fourbanger
Jul 27 2018 2:23am
Forum: E-Bike General Discussion
Topic: Seeking opinions on my ebike project ideas (noob)
Replies: 9
Views: 754

Re: Seeking opinions on my ebike project ideas (noob)

From the Ruff Cycles web site: "PORUCHO - Toot-f***ing-Toot...imagine yourself as a young storm trooper swaggering that thing at walking pace down Hollywood Boulevard with a fine female spread legged on roller skates over the back wheel grabing firmly with both hands to your oiled up trapezius muscl...
by fourbanger
Jul 27 2018 1:58am
Forum: E-Bike General Discussion
Topic: Mystery Bafang Motor.
Replies: 9
Views: 584

Re: Mystery Bafang Motor.

Probing a little deeper seems to reveal that this is quite likely one of the first incarnations of the BPM motor. Also it just occurred to me, having not too long ago "crossbroken" an earlier model REAR BPM, that it did indeed have a rather oversized stator carrier [EDIT: side cover] bearing, just a...
by fourbanger
Jul 27 2018 1:44am
Forum: E-Bike General Discussion
Topic: Two chains on triple crankset? Gonna rub or not?
Replies: 30
Views: 1413

Re: Two chains on triple crankset? Gonna rub or not?

@Markz I'll have to catch up with you on that another time. I'm all over the idea of mid mounted hub motors these days. @MrNotEnglish You could try asking this guy if his bracket will fit the 1016 you have. But doesn't yours come with a foot welded on with four bolt holes? If so, just use U bolts me...