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ZeroFret clicked Likes for this post: Universal-ish? by flo

1 Day Ago

ZeroFret clicked Likes for this post: Universal-ish? by Stevo

1 Day Ago

flo replied to the thread Universal-ish?.
" Hi,
well the motor mounting plate as well as controller space would be easylie made swapable.
Leaving the battery pack..
IF you can leave enough space around the pack even that should give you (hopefully ) the flex you will need in future.

As an example as how to mount an e-mot, that could easy being swapped for one using a different mounting pattern, have a look at my build (just for ideas)
"sachs xtc 125" here on el-moto..

greets

flo "

1 Day Ago

ZeroFret replied to the thread Another n00b enthusiast just vampiring up the place.
" Well when I got the bike it had been sitting outside under a cover for about seven years. I got it home and almost immediately got to work servicing everything I could. New fluids, brake pads, tires, plus valve adjustments, carb cleaning, brake rebuilds, and probably some other stuff I'm not remembering. I got it running, verified that everything works. But at some point in there I started taking it apart, and messing with lots of other stuff too. New lights, and gauges, a trimmed saddle, bobbed and rewelded rear end, and currently I'm fabricating a custom seat fairing.

I've had a fair share of setbacks along the way. Honestly I should have just left it alone, kept it stock, and maybe I'd be riding it instead of it taking up space in my little workshed. But here we are, and now I have to see it through.

Attachment 8440
Attachment 8441 "

1 Day Ago

Stevo replied to the thread Universal-ish?.
" I'm on version 3.3 of my original build. Some guys on here have built many different creations.
You will need to design, manufacture and implement all the control mounts yourself depending on what chassis you use.
The sky is the limit. The budget is limiting.
My build is at the point where battery upgrades in 5-6 years is hopefully all I will need to do.
But the last ten years of building the different versions was an important and fun learning process. "

2 Days Ago

Stevo replied to the thread Another n00b enthusiast just vampiring up the place.
" Where are you at?
I still keep my VFR for long rides and don't think twice about gas or my effects on the known universe... at oil under 10 bucks a barrel I'm glad I
still own some gas guzzlers! I figure I've been riding motorcycles most everyday for the past 34 years that I've already consumed much less fuel than most other people
at my age.
I love my emc for commuting 2 miles to work. I still have to work as long as I am Corona free. "

2 Days Ago

ZeroFret created the thread Universal-ish?.
" I'm in the early stages of planning my EV project, mostly reading old threads here, and just trying to soak up information and how-to's. But I came up with a question and search results didn't yield anything.

In a nutshell, is there a such thing as "universal" or even "slightly-more-universal-than-others" EV components? Primarily I'm talking about sizes and the mounting of components within a frame.

For example, I've seen lots of motors with varying specifications in terms of their performance and compatibility with controllers, etc., but each one needs to be solidly bolted to a plate or some such, so is there a unique plate for every motor, or are there certain motors that could all use the same plate? Similarly, there seems to be some batteries that are more widely used than others, so are there batteries that share dimensions, but advertise differing levels of energy density?

The basic reason I ask is easy to explain. However I spec out my EV project when I get to it, I'll get the best components I can afford, and I'm sure I'll have a bike I can be proud of, but what about a few years later when it's already outdated, and a better motor/controller/battery option is available? Or what if I just decide that I want to take my street bike to the track (unlikely for my slow ass, but still)? Ideally, I just get the newer better component and swap it in, right? But if there's no such thing as "universal" than I'm basically rebuilding the bike every time.

Any input on this? "

2 Days Ago

rfndzc replied to the thread 1972 Honda CB350F conversion.
"
Quote Originally Posted by tylerwatts View Post
Really like your use of the mounts for the battery cage. How do you plan to cover the terminals etc?

Have you planned for mounting the motor yet?

Cheers
Tyler
Thanks Tyler! Battery terminals will have busbars nuts and nylon caps. Then a cover for the battery cage (can i call it a fairing?) I will fabricate out of 16ga sheet, with a layer of 1/8” ABS and another of thin foam rubber mat for added protection between the steel cover and the terminals.

Yes, the motor is contemplated and have already brought the mounting plate design to a machinist. It will be CNC’d from 3/8” aluminum. The space is incredibly tight and tolerances are minimal, I have put a lot of attention into maximizing power available to this machine. I hope to have the motor installed by next week. "

3 Days Ago

tylerwatts replied to the thread 1972 Honda CB350F conversion.
" Really like your use of the mounts for the battery cage. How do you plan to cover the terminals etc?

Have you planned for mounting the motor yet?

Cheers
Tyler "

3 Days Ago

tylerwatts clicked Likes for this post: 1972 Honda CB350F conversion by rfndzc

3 Days Ago

tylerwatts replied to the thread Italjet Dragster conversion.
" Well I spent some time disassembling the scooter drive unit to see how I might integrate a motor into the unit. I quite like the appearance of the unit and was hoping to keep it in the scooter, kind of like a sleeper race scooter thing. And the gearing flexibility is really useful.

https://uploads.tapatalk-cdn.com/202...2e1677f95d.jpg

Wasn't able to remove the alternator flywheel but will try again tomorrow. It has a great little water pump that I could reuse potentially.

https://uploads.tapatalk-cdn.com/202...5b4aeaff95.jpg

https://uploads.tapatalk-cdn.com/202...0d56e0501d.jpg

But there isn't a lot of space in the bore and would require some significant boring out to fit a motor in there. Looks like a motor would have to have a long shaft through the crankcase to the belt drive. Looks like getting a larger 4t motor could be better but might cause other problems.

https://uploads.tapatalk-cdn.com/202...2598805268.jpg

Here's some dimensions for considering replacing the unit with a hub or mid drive kit:

https://uploads.tapatalk-cdn.com/202...eafa37bc58.jpg

https://uploads.tapatalk-cdn.com/202...76d8bf5364.jpg

https://uploads.tapatalk-cdn.com/202...0bfa0dd821.jpg

https://uploads.tapatalk-cdn.com/202...bd2d2dcc76.jpg

I need to get some more pics of the motor position relative to its pivot mount and work out the wheelbase from which I'd fit a mid drive or hub motor swingarm in. Hub would give shorter swingarm which might be better but I'm keen to use a mid drive somehow.

Cheers
Tyler "

3 Days Ago

tylerwatts replied to the thread Italjet Dragster conversion.
" Hi Rob
Thanks. I've seen bigger form cylindrical cells like 21700 but not slot of people using them. I'll show some pics but I'm also not sure I can get those cells in my frame.
I like the prismatic cells but I don't believe there is as much risk these days with lithium cells.

See updates above.

Cheers
Tyler "

3 Days Ago

tylerwatts clicked Likes for this post: Italjet Dragster conversion by rfndzc

3 Days Ago

rfndzc replied to the thread 1972 Honda CB350F conversion.
" Views of the battery cage showing the original motor mounts in use with no modification to frame. Front bracket was simply flipped upside down to accomodate the 23s. Top two bolts were previously used for cable holders and will continue to serve this as well.
Attachment 8435 Attachment 8439 Attachment 8437 "

3 Days Ago

Richard230 created the thread Cake Osa wins an EV award.
" Here is a link to a report about the Cake Osa winning a Red Dot award - whatever that is. I note that Cake has managed to make a production motorcycle look just like a homemade one.

https://electricmotorcycles.news/cak...gn-award-2020/ "

3 Days Ago

rfndzc replied to the thread Italjet Dragster conversion.
" I said Lipo but meant just the Li-ion 18650/21700 (lithium cobalt, i think. not lithium polymer). The 21700 are a more recent tech, slightly larger and more power dense and will require fewer batteries/connections for the same power output. Less work, more play. Being slightly larger you have more volume dedicated to chemistry and less to the protective structure. These are the cells Tesla has moved to producing for themselves. Unfortunately being newer there are fewer components on the market for them, specifically the variety of cell holders for 21700 are limited to square spaced (I couldn't find honeycomb shaped for the 21700). If you have 3d printing skills then you can surely leverage them for your custom pack shapes with honecomb cell holders for higher density. I stayed away from Lithium cobalt cells because I don't have enough experience with building cell packs and did not want this particular bike that I'm working on to catch fire. Prismatic lifepo4 cells (as in those I'm using) are more stable/robust though a bit less power dense.

Rob "

3 Days Ago

tylerwatts clicked Likes for this post: 1972 Honda CB350F conversion by rfndzc

3 Days Ago

tylerwatts replied to the thread Italjet Dragster conversion.
"
Quote Originally Posted by rfndzc View Post
Hard to tell from the pics and the acronyms (2t, 4t, rhs..). I would advise against keeping an SVT (i got that one) for small machine where space is the real premium. You can sub out a clunky svt with solid calculation on drive specs (top speed desired, amperage, voltage, gearing...) and put that space to better use (battery or
motor?). Maybe just a profile diagram of the layout would simplify understanding the machine.

If you are looking at 18650’s you should have seen 21700’s as well. Let’s talk about the advantages there. I think if you feel comfortable with building out a custom lipo pack, that would be a big advantage as you could really fit a lot of power into some rare shapes and spaces. Thanks for sharing
Hi rfndzc

2t is 2 stroke, 4t is 4 stroke engines.
RHS is right hand side.
I apologise for using acronyms, just lazy of me.

Why do you recommend 21700 form cells? I have thought about using other sizes but not checked actual space. If you look under the front shock in the middle of the frame there is a narrow channel probably big enough for 1kwh of small cells, or a controller. That is driving me down the smaller 18650 route.

https://uploads.tapatalk-cdn.com/202...746b027552.jpg

But yes, I just measure up properly.

Thanks for the feedback. I will get better pictures or diagrams as you say. Any recommendations for sketching apps on Android appreciated.

Cheers
Tyler "

3 Days Ago

rfndzc replied to the thread 1972 Honda CB350F conversion.
"
Quote Originally Posted by tylerwatts View Post
Ah those look like kart sprockets then. That seems like a good approach, lots of choice.
I noticed you said you were looking to use a very low gear ratio, what size sprockets will you be using?

Cheers
Tyler
The stock gearing that came with the bike is 17/38. For the chinese motor manufacturers that operate at higher rpm I would have needed a lower ratio (smaller front sprocket and/or larger rear). Because I was able to find Revolt and they offer a custom kv, I basically set kv for a factory gearing, but for a top speed of about 55mph. Again, I am into low end torque and acceleration, not top speed.

26kv at 72v gives ~1600 loaded rpm (~1800 unloaded). My rear tire is now a 4.00 on an 18" rim, thats .33m radius, and ~55mph top speed at that rpm with a 16/38 ratio, and 45mph at a 13/38 ratio with a bit stronger accel. So to answer your question, I bought a 16 and I bought a 13.


Edit: If I said I opted for a 'lower' ratio it was thinking of an inverted ratio, rear/front, so ~2 vs ~4, because I was able to use a custom kv instead of a 'higher' ratio for more torque/less speed. I think it is more intuitive to consider front/rear, but the resulting number (.4 vs .3) is maybe less intuitive. "

3 Days Ago

rfndzc replied to the thread Italjet Dragster conversion.
" Hard to tell from the pics and the acronyms (2t, 4t, rhs..). I would advise against keeping an SVT (i got that one) for small machine where space is the real premium. You can sub out a clunky svt with solid calculation on drive specs (top speed desired, amperage, voltage, gearing...) and put that space to better use (battery or
motor?). Maybe just a profile diagram of the layout would simplify understanding the machine.

If you are looking at 18650’s you should have seen 21700’s as well. Let’s talk about the advantages there. I think if you feel comfortable with building out a custom lipo pack, that would be a big advantage as you could really fit a lot of power into some rare shapes and spaces. Thanks for sharing "

3 Days Ago