GNG, 1000W 48V BB-drive, $400

LightningRods said:
speedmd said:
:lol: :lol: :lol: :D The last one got some juice flowing for certain. Agree, no problem running blowers with big pulleys and not much reduction or a cruising bike that can barely get out of it's own way with one that is way oversized.
Click to expand...

Denise hit the nail on the head when she said that I enjoy wrestling with the engineering problem of the pulleys and belt. The #25 chain conversion is a simple and obvious fix. There really isn't a whole lot to do there. If I can make the belt work, which I believe that I can, I think it's going to be a great alternative to the chain.

I'm still casting test pulleys. The first urethane that Smooth-On sent me was super tough but didn't have high enough heat resistance. I've just received a high temp (250 degrees F) urethane with a Shore hardness of 85. A construction hard hat is 80.

I want to make both a 95 tooth and a 120 tooth driven available. The 120 has better reduction obviously, but the 95 will engage more teeth on the 18 tooth driver and actually allow the drive to transmit more power.

I couldn't resist the obvious ad-style pandering of the bike with scantily clad girls sticking their butts out. Too many years in advertising..... :D
Click to expand...

Harleybelt2.jpg


Where are the belts? :lol:
 
Hi LR

I Keep reading (looking at) your post. :) Seriously you certainly can get a belt to work with this little motor, but I don't think for long without a idler. I have a bunch of stainless 608 bearings if you want to make some passive ones to add a good amount of wrap. With your adjustment plates the idler can be stationary on a nice solid 5/16 or 8mm bolt.
 
skyungjae said:
I wonder if increased chain wear would be more of an issue than wear on the small sprocket. The GNG Gen 2 sprocket doesn't like added power as there are pictures of them cracking under increased A.

http://endless-sphere.com/forums/viewtopic.php?f=28&t=45740&start=150#p730967
Click to expand...

With too few teeth on the sprocket and too few rollers engaged, everything is overloaded. To make matters worse the chain is 'polygoning' which means that it's being bent at a severe angle while too few rollers are being hammered with too much power. It's just bad engineering. GNG did the same thing on the Gen 2 secondary and the Gen 1 primary belt. There is a minimum number of teeth on either sprockets or pulleys that works properly. For sprockets it is usually 12 teeth and for pulleys it's usually 16 teeth.

I'm developing a 12 tooth 219 secondary driver for the Gen 2. I'm sure that I or someone will end up doing similar for this new 60v kit. Or maybe I'll do a belt conversion for it. :lol:
 
speedmd said:
Hi LR

I Keep reading (looking at) your post. :) Seriously you certainly can get a belt to work with this little motor, but I don't think for long without a idler. I have a bunch of stainless 608 bearings if you want to make some passive ones to add a good amount of wrap. With your adjustment plates the idler can be stationary on a nice solid 5/16 or 8mm bolt.
Click to expand...

Hey SpeedDoc-
I tend to think that you're right about the idler- for a 120 tooth driven sprocket in this tight space. The belt angle on the driver is out of spec. I'm going to push the 95 tooth forward because the belt angle with an 18 tooth is better than stock GNG. With a 20mm wide 18 tooth GT2 driver I really should be good. Just the change to GT2 and the additional width is good for 2.6x the power capacity. Add in a couple more teeth engaged over the GNG 14 tooth and I think I've got it. I'm mostly fussing over production materials right now.
All of this is in good fun. What a blast this cheap little Chinese e-bike kit is to play around with. This really is the VW Beetle or Honda Civic of the e-bike world.
I'll pull you in when I start playing around with the 120. It will be great for high voltage/high rpm applications to gear down. I think you're right about needing that idler to make it bulletproof.
Cheers-
Mike
 
ferret said:
On the front end plate of the motor there is a bulge that houses the front bearing. Can anyone please measure the height and diameter of the bulge?
Click to expand...

Here you go:

Diameter: 50.02mm or 1.97"
Height: 5.25mm or .206"
 
Just got a pat on the back so to speak, My nephew who is an avid downhill mountain biker just got back from a trip to Whistler bike park where " Kranked or Cranked" electric bike company was putting on demo's , he rode one on the single track there for half an hour and was stoked with it. on his way home to CA. he stopped by Colorado for a couple days for a visit and we went riding my two e-bikes on some serious single track, we rode as hard as my bikes have ever been ridden, it was all I could do to keep up, the bikes worked flawlessly.
He says he is astounded by my bikes, more torque, better throttle response, longer run time and about the same top speed as the cranked bikes, A kit from cranked is around $5000 without the bike, these are modified cyclone kits and they carry the batteries in a backpack.
Anyway, it was cool to get a firsthand comparison from someone I trust and know is a top rider.
LR is right, what a gem we have in this little motor, cost per smile and fun is miniscule :D
Thinking about a third build with my Maverick ML7. :roll: :roll:
"D"
 
Denisesewa said:
Just got a pat on the back so to speak, My nephew who is an avid downhill mountain biker just got back from a trip to Whistler bike park where " Kranked or Cranked" electric bike company was putting on demo's , he rode one on the single track there for half an hour and was stoked with it. on his way home to CA. he stopped by Colorado for a couple days for a visit and we went riding my two e-bikes on some serious single track, we rode as hard as my bikes have ever been ridden, it was all I could do to keep up, the bikes worked flawlessly.
He says he is astounded by my bikes, more torque, better throttle response, longer run time and about the same top speed as the cranked bikes, A kit from cranked is around $5000 without the bike, these are modified cyclone kits and they carry the batteries in a backpack.
Anyway, it was cool to get a firsthand comparison from someone I trust and know is a top rider.
LR is right, what a gem we have in this little motor, cost per smile and fun is miniscule :D
Thinking about a third build with my Maverick ML7. :roll: :roll:
"D"
Click to expand...

http://kranked.myshopify.com/products/ego-kit

Yep, it's the German Ego-Kit which is a cyclone in a fancy bracket. :lol:

Purchasing the kit through them requires you shipping the bike to them for installation and testing.

The GNG + various upgrades + battery is still way cheaper than the Ego-Kit. :wink:
 
skyungjae said:
Denisesewa said:
Just got a pat on the back so to speak, My nephew who is an avid downhill mountain biker just got back from a trip to Whistler bike park where " Kranked or Cranked" electric bike company was putting on demo's , he rode one on the single track there for half an hour and was stoked with it. on his way home to CA. he stopped by Colorado for a couple days for a visit and we went riding my two e-bikes on some serious single track, we rode as hard as my bikes have ever been ridden, it was all I could do to keep up, the bikes worked flawlessly.
He says he is astounded by my bikes, more torque, better throttle response, longer run time and about the same top speed as the cranked bikes, A kit from cranked is around $5000 without the bike, these are modified cyclone kits and they carry the batteries in a backpack.
Anyway, it was cool to get a firsthand comparison from someone I trust and know is a top rider.
LR is right, what a gem we have in this little motor, cost per smile and fun is miniscule :D
Thinking about a third build with my Maverick ML7. :roll: :roll:
"D"
Click to expand...

http://kranked.myshopify.com/products/ego-kit

Yep, it's the German Ego-Kit which is a cyclone in a fancy bracket. :lol:

Purchasing the kit through them requires you shipping the bike to them for installation and testing.

The GNG + various upgrades + battery is still way cheaper than the Ego-Kit. :wink:
Click to expand...
i just looked at that ego-kit, that is one ugly mother&@&&%@& of a motor,, much prefer the looks of the gng anyday
 
lightingrods I must be getting old , scantily clad girls with their butts out nice !!! But what bike are you talking about ?
 
gknowes said:
lightingrods I must be getting old , scantily clad girls with their butts out nice !!! But what bike are you talking about ?
Click to expand...

I'm right there with you Gary. When a girl on the street gets between me and a bike I'm wanting to look at it I'm like, "Move it girl, I'm trying to check out that bike!"
 
LightningRods said:
gknowes said:
lightingrods I must be getting old , scantily clad girls with their butts out nice !!! But what bike are you talking about ?
Click to expand...

I'm right there with you Gary. When a girl on the street gets between me and a bike I'm wanting to look at it I'm like, "Move it girl, I'm trying to check out that bike!"
Click to expand...

... But I'll wait
:mrgreen:
 
speedmd said:
Mike! Seriously, check to make sure its still ticking or at least if you can still fog a mirror. :p .. :)
Click to expand...

Well if you want to be completely accurate about it, it would depend on the girl and the bike. There are all kinds of comparisons to be made but not in this venue. :p
 
skyungjae said:
IMG_20130531_172026.jpg
Click to expand...

Hi skyungjae :)

please tell me how do you fit the chainwheel crank freewheel and where are the parts from (Chainwheel, freewheel cranks...? Iam from Norway and I want to mod my original GNG Freewheel Chainwheel-Crank at my gen2. Many Thanks :)

Mic
 
Had some trouble programming the current limit on my Lyen controller, so I went for a ride with no limit. The GNG motor was a lot of fun hitting peaks of 7000w. I had to take frequent breaks to let the motor and controller cool, and the fun ended after the phase wires melted through their insulation and shorted which killed the controller.

I think I will aim to limit the current at around 5000w, would that be fine on the 12fet high voltage Lyen or should I spring for the 18fet?
 
crossbreak said:
still have some in spare, would sell them cheap. why use crappy cyclone ones? The stock GNG are better
Click to expand...

The only Cyclone that really has an advantage is the ISIS version. The thicker spindle is a lot more durable than the GNG for jumps, etc.

I just ordered a 16 tooth ACS Crossfire freewheel. It fits the GNG BB housing where the support bearing is, perfectly.
 
My ACS flanged freewheel has not gotten any looser on mine. It has a extra thin spacer in there, that I am too lazy to pull apart and remove. No support bearing at all. Fits a standard mountain bike square bb which there are many strong ones to choose from. The suntour I am using is at least as good as any of the isis stuff.
 
bee said:
How do you take apart the GNG motor? I want to upgrade my phase wires.
Click to expand...

Me 2!!! Can someone tell us how ? like a tuturial?
 
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