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zeropointbug · 04.27.2010, 02:58 PM

I have been checking out electric bike conversions for a few weeks now and I think I would like to convert a downhill/freeride bike to electric power.

I don't know what you are using in your bike Metallover, but do you know if anyone has had good success with the MARS 12hp BL ETEK motor? I know it's not very efficient at low power as it has high idle current. With this motor you could easily hit 100+kph without the motor breaking a sweat. But, also because it's not very efficient on the low end, you have to keep your speed up there to return decent efficiency, otherwise it's quite bad, below 70%, even 250watts @48volts, you are only getting 50% efficiency. So you know what I mean. This route would be FUN for sure, but maybe not so simple, or as efficient, and even durable in a bike.

The other option is a Crystalite X-5 series wheel hub motor, capable of 2000watts at 72volts. This would be a more efficient and probably safer/smarter, cheaper, simpler way to go obviously. However I would like to have up around 3000watts or more, like what the "Stealth Bomber" bike has. I have looked and looked, but I can't find a wheel motor with more than 2000watts, or at least a controller that will drive it more than that.

I know a downhill/freeride bikes are very stable at very high speeds, so I would like to be able to have a top speed of upwards of 100km/h or 60 mph... some of you might think that is way too fast, but i have held onto a car going 80km/h and it was absolutely fine, so I say 100k is doable.

The Stealth Bomber bike is exactly what I would like to do, as far as setup and looks. Would I be able to get a hold of the 3000watt wheel motor that they use? Do you think it is custom made motor? Or just over volted to obtain that power output?

-Batteries are most likely going to be A123 cells, either M1's or the new "Industrial cell" that Enerland/A123 has under 'coming soon' .... if not, then Headway cells are an option as well.
-Range I would like at 60km/h is around 40 miles

At this moment I don't know what route to do as I haven't seen anyone use the MARS BL ETEK motor in a bike except for this guy, but he is using a poor setup and appears to be using some weak lead acid batteries with it, which doesn't make too much sense. lol

Would like to hear some input from anyone who has built an Ebike.

	(#36)
zeropointbug Z-Pinch racer Offline Posts: 3,141 Join Date: Nov 2006 Location: SK, Canada	04.27.2010, 02:58 PM I have been checking out electric bike conversions for a few weeks now and I think I would like to convert a downhill/freeride bike to electric power. I don't know what you are using in your bike Metallover, but do you know if anyone has had good success with the MARS 12hp BL ETEK motor? I know it's not very efficient at low power as it has high idle current. With this motor you could easily hit 100+kph without the motor breaking a sweat. But, also because it's not very efficient on the low end, you have to keep your speed up there to return decent efficiency, otherwise it's quite bad, below 70%, even 250watts @48volts, you are only getting 50% efficiency. So you know what I mean. This route would be FUN for sure, but maybe not so simple, or as efficient, and even durable in a bike. The other option is a Crystalite X-5 series wheel hub motor, capable of 2000watts at 72volts. This would be a more efficient and probably safer/smarter, cheaper, simpler way to go obviously. However I would like to have up around 3000watts or more, like what the "Stealth Bomber" bike has. I have looked and looked, but I can't find a wheel motor with more than 2000watts, or at least a controller that will drive it more than that. I know a downhill/freeride bikes are very stable at very high speeds, so I would like to be able to have a top speed of upwards of 100km/h or 60 mph... some of you might think that is way too fast, but i have held onto a car going 80km/h and it was absolutely fine, so I say 100k is doable. The Stealth Bomber bike is exactly what I would like to do, as far as setup and looks. Would I be able to get a hold of the 3000watt wheel motor that they use? Do you think it is custom made motor? Or just over volted to obtain that power output? -Batteries are most likely going to be A123 cells, either M1's or the new "Industrial cell" that Enerland/A123 has under 'coming soon' .... if not, then Headway cells are an option as well. -Range I would like at 60km/h is around 40 miles At this moment I don't know what route to do as I haven't seen anyone use the MARS BL ETEK motor in a bike except for this guy, but he is using a poor setup and appears to be using some weak lead acid batteries with it, which doesn't make too much sense. lol Would like to hear some input from anyone who has built an Ebike. “The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens