Search found 33716 matches

by dogman dan
Dec 10, 2017 8:04 am
Forum: E-Bike Technical
Topic: High wattage hub motor for 150mm drop out required
Replies: 7
Views: 81

Re: High wattage hub motor for 150mm drop out required

I'd be looking at scooter motors, so you can use a high speed scooter tire.

You need to find the motor, then build the frame to fit IMO.

I'm sure my comment sucks, since I can only guess at what type of vehicle this is. Street or dirt? At 8000w, I sure would steer away from bike rims and tires.
by dogman dan
Dec 10, 2017 8:00 am
Forum: E-Bike Technical
Topic: v-brake front fork mounting points?
Replies: 7
Views: 85

Re: v-brake front fork mounting points?

I would guess that height above the rim for the boss could be measured right off the particular v brake you plan to use. Or just copy a fork, or rear stay measurement. Distance from center of axle to the center of the boss, for that wheel size. Then like Chalo said depending on the wheel you plan to...
by dogman dan
Dec 10, 2017 7:51 am
Forum: E-Bike General Discussion
Topic: Recommendations for rear rack bag?
Replies: 9
Views: 327

Re: Recommendations for rear rack bag?

You should see the rack Amberwolf welded up a few years back. It could hold 200 pounds I bet. Built cross braced like a truss. One idea I have not tried yet, make badass torque plates for a rear motor that also include a much beefier rack attachment point. This would be for an aluminum frame. Steel,...
by dogman dan
Dec 10, 2017 7:49 am
Forum: E-Bike General Discussion
Topic: Freewheel Maintenance
Replies: 4
Views: 106

Re: Freewheel Maintenance

Where I ride off road, cheap screw on freewheel pawls get full of sand. Lying the bike on its side, I pour motor oil in it and let it rinse the sand out the other side. You can use a lighter oil too, like zoom, or 3 in 1, sewing machine oil, etc. Motor oil is cheapest. I just fill an old zoom oil co...
by dogman dan
Dec 10, 2017 7:36 am
Forum: Battery Technology
Topic: So confused, please help (24s 99.6V battery charging/safety)
Replies: 20
Views: 263

Re: So confused, please help (24s 99.6V battery charging/safety)

Just happen to have a spare, unusable, kitchen stove around now. Makes a good weatherproof, rat proof box is all. Perfect outdoor storage. Easier to use an old barbeque grill for most. Glass top, so the surface makes a good non conductive table top. For a colder climate, use old tiny fridge, or ice ...
by dogman dan
Dec 10, 2017 7:24 am
Forum: Battery Technology
Topic: Short battery duration
Replies: 7
Views: 197

Re: Short battery duration

To go town to town, triple, or quadruple your capacity. Obviously you might have to backpack a battery that big. Never trust my math, somehow I got the idea you were running 16s. 8s means your battery is even smaller. 30 volts x 6 ah. that's a puny 180 watt hours. Nobody is going 20 km on 180 watt h...
by dogman dan
Dec 10, 2017 7:19 am
Forum: General Discussion
Topic: Dogman Dans E bike burns his house.
Replies: 161
Views: 9828

Re: Dogman Dans E bike burns his house.

Funny how even little changes mess with you after you live someplace a long time. Another thing we changed here is removing the glass shower door on the master bath tub. I rarely used that shower because I constantly scraped a new bald spot on my head on the top frame if I did. Now it has a curtain,...
by dogman dan
Dec 09, 2017 8:21 am
Forum: E-Bike General Discussion
Topic: Most powerful rear hub motor for 135mm MTB frame?
Replies: 13
Views: 494

Re: Most powerful rear hub motor for 135mm MTB frame?

Yes, with a single speed instead of 7 gears in back, lots of room to change the axle. I just meant to say that if you want all 7 ( or 7 of 8)gears, a large crystalyte fits fine in regular bikes. Ok, so 3000w is lame these days, but I get all I need out of 2000w or so. Running 60v, my cargo bike with...
by dogman dan
Dec 09, 2017 8:10 am
Forum: E-Bike General Discussion
Topic: Is this torque arm configuration ok?
Replies: 4
Views: 140

Re: Is this torque arm configuration ok?

Looks ok to me. Omit the washer if you need to, to get the nut fully on good threads. Better if possible, to install the axle part of the TA different, and then bolt right to the frame, drilling a new hole in the dropout plate. This is not always possible, but if it is, go for that. This photo shows...
by dogman dan
Dec 09, 2017 7:54 am
Forum: Battery Technology
Topic: Battery Failing Under Load?
Replies: 2
Views: 117

Re: Battery Failing Under Load?

Hard to say what you mean by sputters. But it could be something else. In particular, you might have a very bad connection to the motor on the main phase wires. Once I had a cut wire, that I just kept failing to see, where the wire rubbed a tire. I had two good wires, but the third motor wire was cu...
by dogman dan
Dec 09, 2017 7:31 am
Forum: Battery Technology
Topic: So confused, please help (24s 99.6V battery charging/safety)
Replies: 20
Views: 263

Re: So confused, please help (24s 99.6V battery charging/safety)

My two cents. Nothing really wrong with the existing charging methods, provided the meanwells are set to the right voltage. (not overcharging) You might consider tuning them to very slightly undercharge the pack, if your needs don't require the entire capacity very often. Using those 4s balance plug...
by dogman dan
Dec 04, 2017 7:19 am
Forum: E-Bike Technical
Topic: Suntour Seat Post Suspension
Replies: 5
Views: 247

Re: Suntour Seat Post Suspension

Likely they simply did not have the item anymore, and the chat guy could not see it on his screen anymore.

All he knows is what he can look up on his screen if he wasn't around two years ago when they did sell it.

Just come up with your own, better, solution for a boot on that post.
by dogman dan
Dec 04, 2017 7:10 am
Forum: E-Bike General Discussion
Topic: Most powerful rear hub motor for 135mm MTB frame?
Replies: 13
Views: 494

Re: Most powerful rear hub motor for 135mm MTB frame?

Likely the easiest to find would be the larger crysalyte motors, using the faster wind for more speed per volt. See them at Grin Technology, and buy there too if you live in north America. You live in Korea though, so look for similar motor in china perhaps. The popular huge muxus of course is not 1...
by dogman dan
Dec 04, 2017 6:58 am
Forum: E-Bike General Discussion
Topic: E-Bike Building Hacks and useful accessories
Replies: 23
Views: 819

Re: E-Bike Building Hacks and useful accessories

My favorite accessory for street has become a cheap rear view mirror. Amazon had nice ones in the scooter style for cheap at one point. 5 bucks a pair. Not sure where to get them now, but they are out there. The bike mirrors, like helmet mirrors I did not like at all. Better motorcycle grade stuff l...
by dogman dan
Dec 04, 2017 6:50 am
Forum: E-Bike General Discussion
Topic: Reliable 4 season car replacement practicalities
Replies: 16
Views: 367

Re: Reliable 4 season car replacement practicalities

Once you are in a job, try like hell for a winter car pool. Trike to his/her house, then ride in the car to work. Shorten that winter ride by at least 20 miles one way. Of course you will pay, but not as much as Uber. Ideally, get rides with several people so you can use other rides when the person ...
by dogman dan
Dec 02, 2017 9:07 am
Forum: E-Bike Technical
Topic: Dumbish Question
Replies: 3
Views: 171

Re: Dumbish Question

Not a dumb question at all. So many motor factories in china, and decades they have run there by now. Definitely similar to the Aotema brushless motor, same shitty connector. Its a sensorless motor similar to the sensored Crystalyte 400 series type. Could be actually made by any of thousands of chin...
by dogman dan
Dec 02, 2017 8:50 am
Forum: E-Bike Technical
Topic: crystalyte hub disassemble without damaging wires
Replies: 2
Views: 74

Re: crystalyte hub disassemble without damaging wires

That shows the proper way to pull a hub cover, but the pics show the non wire side. Same procedure on the wire side, but a bit slower and easy, as you make sure the wire feeds through the notch cleanly. If the wire was damaged, and a crapton of tape, shrink or other stuff is on it, you have to caref...
by dogman dan
Dec 02, 2017 8:38 am
Forum: E-Bike General Discussion
Topic: Recommendation for vertical bike hooks?
Replies: 9
Views: 225

Re: Recommendation for vertical bike hooks?

The type Chalo showed worked good for me. Just look for one that is not too cheesy. I think you can find those these days, at home depot or Lowes, stores like that. The trick for using them with a heavy bike is adjusting them exactly the right height, so the back wheel does still touch the ground, a...
by dogman dan
Dec 02, 2017 8:31 am
Forum: E-Bike General Discussion
Topic: Another Seat Rail Bites The Dust
Replies: 16
Views: 406

Re: Another Seat Rail Bites The Dust

Move your seat 2 inches or so back, with a thudbuster seatpost.

Then you can put the rail in the middle, or farther back, and still have your seat more to the rear.
by dogman dan
Dec 02, 2017 8:23 am
Forum: Battery Technology
Topic: Short battery duration
Replies: 7
Views: 197

Re: Short battery duration

No, if you have two 200 amps controllers, your motors DO, at least briefly, pull 400 amps from your battery. Motors don't limit shit, they pull all they can when loaded, till the rpm comes up and load drops, and then they pull less. So the battery really hates that, I guarantee it. 65 amps each 3 fe...
by dogman dan
Dec 02, 2017 8:11 am
Forum: General Discussion
Topic: How to keep LiFePO4 warm in cold climate?
Replies: 6
Views: 168

Re: How to keep LiFePO4 warm in cold climate?

I'd want to know if the battery is balanced. Of course, they likely made checking that impossible. If there is a bms, then putting it on the trickle charger a few nights likely did balance it. Keeping it on trickle daily could kill it. You don't trickle charge lithium. Its not like lead, that loves ...
by dogman dan
Dec 01, 2017 6:40 am
Forum: Battery Technology
Topic: Short battery duration
Replies: 7
Views: 197

Re: Short battery duration

20 amp controllers or less. 6 ah x 65v is 390 watt hours. if you pull max 200 amps, x2, that's 26000 watts. So to run an hour you'd need a 26000 wh battery. Obviously you don't pull that much watts continuously, or even for one second. Lets just say you might be actually cruising pulling 400w, that ...
by dogman dan
Dec 01, 2017 6:30 am
Forum: General Discussion
Topic: Dogman Dans E bike burns his house.
Replies: 161
Views: 9828

Re: Dogman Dans E bike burns his house.

Our master bath did not even have a decent place to put the tp hanger designed in, let alone handicap bars near the shitter. Just before the fire I had started remodeling that bath. By flipping the door to swing out, I could at least add a bar just in front of the toilet. Then with the taller, long ...
by dogman dan
Nov 30, 2017 7:20 am
Forum: E-Bike Technical
Topic: High-speed, long-distance (heavy "30^3") Q128 commuter build
Replies: 67
Views: 2108

Re: High-speed, long-distance (heavy "30^3") Q128 commuter build

That video looks exactly normal to me, for a gear motor wheel. They coast fine on the road, but in the shop, there is clearly a lot more friction in the hub than a normal, well operating bike wheel. There is also more mass, so maybe you don't get quite the same initial rpm from one pedal stroke as w...
by dogman dan
Nov 30, 2017 7:03 am
Forum: E-Bike General Discussion
Topic: Looking for fake engine and engine sound for E-chopper
Replies: 15
Views: 344

Re: Looking for fake engine and engine sound for E-chopper

Actually just the sound he was looking for. Does sound a lot like a motor. loop that sound bite, and let it play on the phone. Seems like there was a kids electric bike a few years back, that had two 12v cells in a plastic V twin engine shaped case. But it looked like cheese, hardly what I'd want on...