okmate

Hello guys i have a cluad butler mountain bike which is fitted with a currie 24v motor on the rear wheel is there a way to make the motor faster? the batterys are new but would love a little extra speed

dumbass 

You could look into this. I've not tried it but it should work provided you don't go nuts with it. There are a lot of people that are running 36v and it you setthe max as in the video that's about what he is running. And for 100 bucks it cheap. Of course you would need a second battey to get the voltage needed.

Bob

https://www.youtube.com/watch?v=ehKSU..._order&list=UL

https://www.youtube.com/watch?v=WjTyB..._order&list=UL

okmate

Hi mate thanks for that link it was very interesting ?
However my currie set up is slightly different that that in the video .
it has 2 batterys in a tray in a currie bag which slides into the rack the speed is controlled by a thumb controller on the bars is there any think i could do with this one ?

Sangesf

Either way, if you want more speed, you have to get a new controller...
Since 2008, currie has put a limiter on their controllers... Even if you hooked up 36v to the current controller, you would still be limited in speed.

You need to get a 36v controller and new batteries. Like in the video.. 36v and controller is the best you'll do... If you go 48v you'll burn out the motor.

okmate

Thanks mate you say since 2008 they put limiters on the motors how can i find out if mine is pre 2008 think it might well be as it was my dads for a while then i friends of his locked away in a garage ?
i will try and upload some more pictures thanks again

okmate

ok managed to fing a photo on the net of my setup have a look see what you think

dumbass 

Lets assume that your setup is a true Currie setup but I'm not sure that truely is. I know there is a second motor that is supposed to be a Currie (upgraded) motor but I've never seen it but maybe you have it. Here's a link to Currie's standard kit setup for the USA. https://www.ezipusa.com/category.php?id_category=8 As you can see it's quite diferent then what you have. Not to say your isn't still a Currie kit though. On a Currie bike they have a s# on the frame and I think it may even have a manufacture date. But not on the kits. So there's no way to know when yours was manufactured.

To my knowedge there are only 3 ways to increase the speed on a Currie while leaving the motor in it's current location. 1) you can get a slight speed increase by going with better batteries (lipo or lifepo4). These batteries will have much less voltage sag thus giving you a little more speed (1 or 2mph). 2) increase the battery voltage. This will likely require a new controller, additional batteries and maybe a throttle so the power lights still work. If this is a direction you decide to take I would recommend contacting the guy in my link and send him pics of your setup. You likely have something simular and would need to do some of your own rewiring though. He could at least supply you with the controller and recommend a throttle. You could also consider buying the standard USA battery rack. But that would be very expensive because you would also need the batteries. But you could still do the conversion and strap a second battery to the top of your existing rack. 3) a lot of guys in the USA replace the freewheel that currently has a 20t gear with a new freewheel with only 16t gear. These freewheels can usually be bought on EBay for under $20. But be sure it is a LEFT HAND FREEWHEEL. This will increase the top speed from around 16mph to around 20mph. However, you will also loose torque so speed gaid will be much slower. Currie motors come in different sizes as well. These conversions have been mostly done on 450w motors. I'm guessing yours maybe only a 250w motor though. The guy that started doing all these freewheel conversions claims he has converted 1 250w Currie and it still increased the top speed the same.

So if your goal is only for more top speed the cheapest thing to do is a freewheel replacement. But if you want more speed and not loose torque more voltage is what you need. REmember, the faster you go the more battey power it consumes.

Bob

okmate

thanks for your help
Its all very interesting' had a look at the link' my setup is exactly as the picture i posted so need to do more digging around i think. As to the controller i wouldnt no where mine is.I'm interested in changing the sprocket though i have found something on ebay that looks ok have a look see what you think
https://www.ebay.co.uk/itm/BMX-FREEWH...item5d2c06a72b

dumbass 

Yes that is what you are looking for. The thing you need to be careful on is the outter flange. It may or may not fit in your bikes drop out area. You need to look at what you currently have and see if there is extra space for the extended flange. Here are a few link that you may enjoy reading. You first is to another forum where Currie bikes are king. There's a lot of great info you can learn form. And you will find a thread on the freewheel modification. The second is a thread on a bike the is very simular or exactly like your and the mods this individual did. Again, good reading to learn.

What you can do is really only limited by your desire and ability.

Bob

PS...my user name on this forum is go4it Feel free to stop by and say hello...Bob

https://www.ebikeforum.com/

https://www.ebikeforum.com/electric-b...ip-2008-a.html

okmate

thanks mate
just noticed that my currie motor is very different to all that i see it has a clamping system that goes round the spokes' so doesnt use a freewheel i will keep on reading and trying to find out some specifications on the motor before i start to upgrade it.
just thinking if a 24v car battery would be good for range with high amps

okmate

thanks mate just made a post

dumbass 

Somewhere, there has to be a freewheel on the motor setup or you would not be able to coast or peddle without the motor very well. I'm assuming you never found the controller in you setup........correct?

You do know a car battery is only 12v right? So you would need 2 of them. That's a hell of a lot of lead to carry around. In the old days when I first started ebiking I bout 4 12v 18ah batteries. Total weight 52 pounds. I get more power and distance from a single 24v 20ah lifepo4 pack now.

Bob

okmate

thanks bob looks likethat idea is out the question

regarding the freewheel ? it has a kind of cover over it ?

Apache Thunder

Car batteries are definitely a no no. Unlike SLA batteries, they are not "sealed". They are also not designed for deep cycles. Car batteries are designed to provide a lot of amperage over a short period of time which was needed to turn the motor and get it started. A car battery can discharge very quickly on a heavy load. If you try to start a car and it takes more then 30 seconds in one start attempt, the battery is effectively dead at that point and would need to be recharged. (that's what the alternator is mainly for on most vehicles. It charges the battery after the car is started)

They can be used in the same manner as SLA batteries, but don't expect it to have the same discharge characteristics that SLAs have (SLA = Sealed Lead Acid). That and deep cycles will damage car batteries even more then they would SLA batteries. Not to mention car batteries are really heavy compared to SLAs. (and larger in size too)

dumbass 

Honestly, I have no idea what they are using for a freewheel so I can't advise you on this one. As for using car batteries....not a good idea but some people have actually put car batteries trailers and towed them behind the bike. Not my way of solving the problem but it works for some.

Bob

okmate

Hi guys i have took the motor off and now can see the following part numbers mac bmc 1-800-622-3406

p/n 12500-2b 300watts bh2-002522

cti186-2 does anyone no if it can be upgraded to 36v