DIY Electric Car Forums banner
1 - 10 of 10 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter · #1 ·
Similar to a few others here, I am planning a motorcycle with a sidecar conversion to an EV. I am still in the early stages and looking for a bike. I'm trying to plan out what all I will need.
So far, here are the specs I have considered:
Total vehicle weight: 1,100 lbs (fully loaded with 1-2 riders)
Desired max speed: 70 mph
Desired range: 50 miles ( I commute 25 miles each way, but my boss has said the company will provide me a way to charge it here)

Based on that, I am thinking about a 72V, 100 Ah setup. What size motor should I be looking for? The stock Urals weigh 750 lbs unloaded and have a 42 HP motor so I was thinking that I want at least 50 HP.

I would like to stay under $5k for the project. I will be doing all of the wrenching and wiring myself. I am a mechanical engineer with a lot of fabrication and machining experience. I also work with a few EEs that have offered to help once I get into more of the wiring and programming aspects.

Thanks for the help!
 

·
Registered
Joined
·
196 Posts
Rather considering the ICE's peak power and the motor's continuous rated output, consider your ICE's power curve.

When accelerating, your power would be lower just after a gear change and highest near your shift point, which probably isn't at redline. Look at the power output in the middle of that revband. This may give you a more realistic ballpark for your motor spec.
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #3 ·
Rather considering the ICE's peak power and the motor's continuous rated output, consider your ICE's power curve.

When accelerating, your power would be lower just after a gear change and highest near your shift point, which probably isn't at redline. Look at the power output in the middle of that revband. This may give you a more realistic ballpark for your motor spec.
That's a good point. Just out of curiosity, what size motor would output about 50 HP anyway? I'll have to look and see if I can find a power curve for the Ural's 750cc. If not, I don't see a problem with having a bit more power because I know with all the batteries and all this thing will probably be HEAVY.
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #5 ·

·
Registered
Joined
·
151 Posts
I have the Dnepnr with the ME 1003. I will be transitioning to an AC-30.
The little ME 1003 performs pretty well. Just a note, it may be my bike (older '83 MT-16) but I wouldn't want to go anywhere near 70 mph on it. 45 to 50 seems scary enough. The newer Ural's may be more refined machines but sidecar dynamics may be a limiting factor as far as speed.
 

·
Registered
Joined
·
151 Posts
I have an 89 mt16 dnepr and was think of going electric. Can you share how you did yours

[Edited by Mod, I think this is what he meant to do]
my Dnepr is finally in the finishing stages with AC-30 (an older version of AC-35) and 1238-6501 controller
It was direct drive and did ok, but I put in a 2:1 reduction using gates synchronous belt. It now goes as fast as I would want to go on this bike. The AC-30 motor plate states 35 hp max 10 hp continuous. its geared to go about 50mph.
 

·
Registered
Joined
·
925 Posts
my Dnepr is finally in the finishing stages with AC-30 (an older version of AC-35) and 1238-6501 controller
It was direct drive and did ok, but I put in a 2:1 reduction using gates synchronous belt. It now goes as fast as I would want to go on this bike. The AC-30 motor plate states 35 hp max 10 hp continuous. its geared to go about 50mph.
Do you have any pictures of the reduction belt drive you came up with?
 
1 - 10 of 10 Posts
Top