GNG, 1000W 48V BB-drive, $400
- Thread starter spinningmagnets
- Start date
bzhwindtalker
100 kW
yeah but changing just the axle is probably not possible. I have a spare 135mm BB I could try but I will need to get it shipped. Oh and it seems like I have a dead hall sensor too 
christerljung
100 W
Tailwhip!! Vid on that please! 
Hi guys ,
Just thought I'd let you know , dad (Roger). Had a few drama's with the belt drive , so has now changed it for a chain drive. Much better , more power , a little more noise . And most of all reliable .
Dad is riding it every day , it has totally given him a new out look on life. Riding all over the fire trails where we used to run training for my boxing for 15 years , going out of town to mates places , getting the bread..ha ha.
Best $400 ever spent.
Tim
Here is what he does most days....cool. For a 66year old..
Just thought I'd let you know , dad (Roger). Had a few drama's with the belt drive , so has now changed it for a chain drive. Much better , more power , a little more noise . And most of all reliable .
Dad is riding it every day , it has totally given him a new out look on life. Riding all over the fire trails where we used to run training for my boxing for 15 years , going out of town to mates places , getting the bread..ha ha.
Best $400 ever spent.
Tim
Here is what he does most days....cool. For a 66year old..
full-throttle
1 MW
How did you remove the original pulley?
bzhwindtalker said:
Cyclone do a free-wheel crank wit an Octalink BB. It may well fit. I have one, so I'll try and line it up with my GNG tomorrow to see how it looks.
http://www.cyclone-tw.com/order-chainwheel.htm
Edit: No good as far as I can see. The GNG chain is 30mm from the BB flange and the Cyclone one is 22mm.
http://endless-sphere.com/forums/viewtopic.php?f=28&t=28921&start=360#p425768
What chain type did Luke use on the Pinkbike? He had mentioned before that it was a small motorcycle roller chain and was surprisingly quiet, but I forgot the size...
Also, whats the tooth-counts on the new sprockets, looks like it has more reduction than the original pulleys.
Concerning the posts on the previous page, I'll just leave this here (disgruntled employee?)
http://awesomegifs.com/wp-content/uploads/frock-these-packages.gif
What chain type did Luke use on the Pinkbike? He had mentioned before that it was a small motorcycle roller chain and was surprisingly quiet, but I forgot the size...
Also, whats the tooth-counts on the new sprockets, looks like it has more reduction than the original pulleys.
Concerning the posts on the previous page, I'll just leave this here (disgruntled employee?)
http://awesomegifs.com/wp-content/uploads/frock-these-packages.gif
full-throttle said:
Hi.
The main motor pulley is part of the motor shaft. So he basically took off the washer in the end of it , then ground it down a little , machined up a sleeve that went over the top of it , and put a sheer pin through it...( you can just see it in pic 2) fits very well. Then threaded the end of it , to hold the new chain cog on.
One note is , between the end of the thread and the hollow in the inside ot the sleeve , he left about 4mm , it take the load , and the side walls of the sleeve are 3mm thick.
Hope that's clear as mud..
Tim
Thud
1 MW
Thank you for the input regarding cadence guy's.
totaly confirms my experiance.
Luke was speaking of his twin turnigy motored specilized bicycle. I forget the actual tooth counts, but the differance in noise is directly atributable to the low rpm Agni (4k rpm's) compaired to the Rc motor(9k+ rpm's)The Agni bike (& i think the current death bike) used #428 motorcycl chain.
I can vouch for the "Dead silent" of the current death bike....it is eirie having so much power & the only sound you hear is tires whistling on the ashphault.
totaly confirms my experiance.
spinningmagnets said:
Luke was speaking of his twin turnigy motored specilized bicycle. I forget the actual tooth counts, but the differance in noise is directly atributable to the low rpm Agni (4k rpm's) compaired to the Rc motor(9k+ rpm's)The Agni bike (& i think the current death bike) used #428 motorcycl chain.
I can vouch for the "Dead silent" of the current death bike....it is eirie having so much power & the only sound you hear is tires whistling on the ashphault.
sn0wchyld
100 kW
Thud said:
isnt it also a product of the size of the drive cog? ie bigger = quieter? I remember seeing a formula (though cant remember it) that linked noise to the rate of change in angle of each link... so either a small drive sprocket or high rpms had an exponential effect on the noise generated... from memory a 14t was the tipping point where things really started getting notably noisier the smaller you went...
mwkeefer
1 MW
Just an update, ordered Tuesday and received my package yesterday!
I didn't have a chance to open and inspect and there was some damage to the box but it didn't appear to effect the contents, the shipping issue is a factor of weight an the rated strength of the post boxes they are using, this is easily remedied.
I'll post an update Monday when I have a chance to unbox and inspect all the parts... I am just quite impressed with the turn around and delivery time at this point!
-Mike
I didn't have a chance to open and inspect and there was some damage to the box but it didn't appear to effect the contents, the shipping issue is a factor of weight an the rated strength of the post boxes they are using, this is easily remedied.
I'll post an update Monday when I have a chance to unbox and inspect all the parts... I am just quite impressed with the turn around and delivery time at this point!
-Mike
parajared
10 kW
Just bought mine using the ebay link.
Has anyone been able to get a temp probe in theirs yet?
I may go with a lyen sensorless on this one. With high rpms sensorless shouldn't be an issue plus it would be nice to have a three way speed toggle switch to tone the little beast down for accelerating from a stand still. Maybe I could use 3 way toggle to make a 24s build possible. Do you think the gears would stand being spun that fast?
Has anyone been able to get a temp probe in theirs yet?
I may go with a lyen sensorless on this one. With high rpms sensorless shouldn't be an issue plus it would be nice to have a three way speed toggle switch to tone the little beast down for accelerating from a stand still. Maybe I could use 3 way toggle to make a 24s build possible. Do you think the gears would stand being spun that fast?
bzhwindtalker
100 kW
Bike gearing will suffer a lot above 1200w, I broke so many chains with my hub motor mid drives!
I emailed Jon at GNG and ordered a new BB from him. Super fast service as always, a pleasure to deal with.
I emailed Jon at GNG and ordered a new BB from him. Super fast service as always, a pleasure to deal with.
bzhwindtalker
100 kW
Some GNG trial action with video :
[youtube]rA7kHzU5tWo[/youtube]
[youtube]rA7kHzU5tWo[/youtube]
kfong
100 kW
Replacing with another non hardened BB seems like a fail to me. I wonder if the cyclone BB are better, mine has held up. Can you take a file to you BB to verify?
bzhwindtalker said:
bzhwindtalker
100 kW
Yep but it will allow me to ride until I find a reall solution.
Cyclebutt
100 W
View attachment 1
Chain guides are EXPENSIVE! Decided to make my own using plastic parts bin dividers. Here it is at mock-up stage.
Chain guides are EXPENSIVE! Decided to make my own using plastic parts bin dividers. Here it is at mock-up stage.
Spicerack
10 kW
Maybe try and get the new bb cryo treated or hardened at an engineering firm. Unless it's made of plastic cheese. Just a thought.
christerljung
100 W
Nice vid bzh! Thanks! Would love to have that t-shirtweather here. It´s almost freeze-temp and too much raining.
Nothing wrong with the music but it would be nice to hear some electric engine sound too. It gives a picture of gearing and handling.
Did you fix the bent BB?
Nothing wrong with the music but it would be nice to hear some electric engine sound too. It gives a picture of gearing and handling.
Did you fix the bent BB?
bzhwindtalker
100 kW
andynogo said:
Great idea! Ill see what I can arrange at school or at work on that subject.
christerljung said:
I did not fix the BB yet so i'm not pedaling a lot, that's why i'm practicing trials while waiting for a solution. I would like to have the sound from the motor but my camera is quite bad at recording it :?
christerljung
100 W
Some thoughts about a modification of the first reduction:
Testing from many GNG-kit owners confirms that the first stage reduction beltmechanism is too weak. At least when overvolting.
(My second idler mod gives the belt a much longer life , but it still seems that the 15mm belt cant handle 3,5 Kw)
Options with different benefits:
chain conversion (like Timbuck)
pros: Reliable and well proven. High efficiency
cons: noisy? dangerous?
Belt upgrade to 25mm width
pros: quiet
cons: Hard to find parts that fit? HTD or synchroflex? Will belt still fail? After how many miles? Drains power with idlers.
gear drive
pros: strong and reliable? possible use of second hand motorgears
cons: Noisy. Expensive? Hard to find fitting gears?
I´m gonna do one of these for my 72v setup.
But which one is the best?
Testing from many GNG-kit owners confirms that the first stage reduction beltmechanism is too weak. At least when overvolting.
(My second idler mod gives the belt a much longer life , but it still seems that the 15mm belt cant handle 3,5 Kw)
Options with different benefits:
chain conversion (like Timbuck)
pros: Reliable and well proven. High efficiency
cons: noisy? dangerous?
Belt upgrade to 25mm width
pros: quiet
cons: Hard to find parts that fit? HTD or synchroflex? Will belt still fail? After how many miles? Drains power with idlers.
gear drive
pros: strong and reliable? possible use of second hand motorgears
cons: Noisy. Expensive? Hard to find fitting gears?
I´m gonna do one of these for my 72v setup.
But which one is the best?
Have a read through this. There's a formula for calculating power ratings. You can buy the pulleys quite cheaply, but you have to machine yhe pilot hole to suit your shaft
http://www.roymech.co.uk/Useful_Tables/Drive/Timing_belts.html
http://www.roymech.co.uk/Useful_Tables/Drive/Timing_belts.html
JennyB
1 kW
neptronix said:
Apparently not, but someone (who?) is running it with a 36v controller. I'd like to hear more of that too.
Also, what is it like, pedalling power-off? Is there a second freewheel in the crank or one in the layshaft?
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