Search found 2664 matches

by speedmd
Feb 15, 2018 10:21 am
Forum: Large EV General Discussion
Topic: Lightweight AWD Sportscar
Replies: 20
Views: 594

Re: Lightweight AWD Sportscar

Tooth centers are high flux change areas. Somewhere in the non magnetic path area of the tooth base look to be much better.

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by speedmd
Feb 08, 2018 12:25 pm
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 62
Views: 1576

Re: Specific heat absorption capacity of disc brakes

Thanks for finding these. No problem. Like the idea of dual rotors, have been playing with the idea and glad you posted as we have many near moto requirements here that can test these lightweights out for suitability. Even if you need to get some outer rings water jet'd out a bit more heavy duty, t...
by speedmd
Feb 08, 2018 9:57 am
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 62
Views: 1576

Re: Specific heat absorption capacity of disc brakes

Origin looks to be fully symmetrical, but possibly some cbore at the mounting screws. Not sure outer slots on the lower cost option would be a issue. KCNC also with a nice lightweight design. https://www.ebay.com/itm/Origin-8-SpeedCheck-Two-Piece-Disc-Rotors-Brake-Part-Disc-Rotor-2p-6b-203mm-Bk/2825...
by speedmd
Feb 07, 2018 10:25 pm
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 62
Views: 1576

Re: Specific heat absorption capacity of disc brakes

The Ashima looks to be more symmetrical at the float points.
https://www.ebay.com/itm/Ashima-Flotor- ... SwEetWAvqN
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by speedmd
Feb 07, 2018 9:47 pm
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 62
Views: 1576

Re: Specific heat absorption capacity of disc brakes

Brakco? Closer to a bi directional design. Float points and outer slots not.
https://www.ebay.com/i/282773086090?chn ... 2056669164
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by speedmd
Feb 07, 2018 9:35 pm
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 62
Views: 1576

Re: Specific heat absorption capacity of disc brakes

Nice! Like the look of the rotors mounted backwards.
by speedmd
Feb 07, 2018 9:24 pm
Forum: Large EV General Discussion
Topic: Lightweight AWD Sportscar
Replies: 20
Views: 594

Re: Lightweight AWD Sportscar

Nice work! :D I always thought one of the best from the past to take inspiration from is the stratos. https://3bv8x43y68hc448rg43goku7yq-wpengine.netdna-ssl.com/media/2012/04/Lancia-Stratos-rally-car_06-990x603.jpg https://3bv8x43y68hc448rg43goku7yq-wpengine.netdna-ssl.com/media/2012/04/Lancia-Strat...
by speedmd
Jan 31, 2018 10:19 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: electric trial bike
Replies: 263
Views: 67477

Re: electric trial bike

I see no need for a flywheel Certainly not if the rotor has a major amount of mass, you would have one already built in. Something with a rotor skeletonized like a Joby would possibly improve with the addition of some rotational mass when bumping the clutch. It may be best when attempting vertical ...
by speedmd
Jan 29, 2018 10:34 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: electric trial bike
Replies: 263
Views: 67477

Re: electric trial bike

The combination of significant weight reduction, super torque of a electric motor, several reduction selections, and good sized flywheel and well behaving clutch will most likely make this a whole new level of trials performance capability.

I can see a need for better wheel-tire locks. :shock:
by speedmd
Jan 28, 2018 9:39 am
Forum: E-Bike Technical
Topic: Sabvoton 72150 Programming Problems
Replies: 11
Views: 275

Re: Sabvoton 72150 Programming Problems

Mine did not set the changes reliably unless I disconnected the battery also. I never leave the battery in my bike overnight so it became evident it was getting different results when giving up with it and putting bike away for next day. This nightmare went on for near a few weeks :evil: . Your dire...
by speedmd
Jan 27, 2018 11:11 am
Forum: E-Bike Technical
Topic: Sabvoton 72150 Programming Problems
Replies: 11
Views: 275

Re: Sabvoton 72150 Programming Problems

That is what worked for me.
by speedmd
Jan 26, 2018 9:18 pm
Forum: E-Bike Technical
Topic: Sabvoton 72150 Programming Problems
Replies: 11
Views: 275

Re: Sabvoton 72150 Programming Problems

I went out and looked closely at my setup. Your correct. Orange is the ignition and the one I got good results when restarting controller to set program changes. The purple I have hard wired in now and was also a issue and had my memory a bit confused. Sorry about that. I was disconnecting the batte...
by speedmd
Jan 26, 2018 4:52 pm
Forum: E-Bike Technical
Topic: Sabvoton 72150 Programming Problems
Replies: 11
Views: 275

Re: Sabvoton 72150 Programming Problems

Purple wire on mine. It is called different things on different data sheets. Looked at the sheet I was using in the shop and has it listed as ignition wire.
by speedmd
Jan 26, 2018 2:42 pm
Forum: E-Bike Technical
Topic: Sabvoton 72150 Programming Problems
Replies: 11
Views: 275

Re: Sabvoton 72150 Programming Problems

I was having the same issues until I used the key switch wire to shut it down (reset) vs the main power connection. It has been relatively reliable on saves since for me. Hall test still fails. Runs good regardless. I have some new hall sensors to install next time I pull the motor apart if I find t...
by speedmd
Jan 23, 2018 11:44 am
Forum: Large EV General Discussion
Topic: Chevy Bolt first drive
Replies: 139
Views: 8655

Re: Chevy Bolt first drive

Nice looking battery. https://insideevs.com/wp-content/uploads/2016/12/chevrolet-bolt-powertrain-1_004-750x430.jpg Nice low profile of cells will allow fit into many secondary apps. Hoping some come along on the salvage market soon. https://insideevs.com/wp-content/uploads/2016/12/chevrolet-bolt-pow...
by speedmd
Jan 22, 2018 10:18 am
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

Why would anyone put patch tape on a nice titanium frame? :roll: It is a simple weld fix. You dont even have to paint it. Silly, really. Any distortion can be taken care of easily by a good mechanic. It does point to a weakness in using straight gauge-diameter tubes in a progressively higher stress ...
by speedmd
Jan 20, 2018 11:30 pm
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

After giving it a good think, I have decided to retire the old Liahana frame. I agree, it served it's purpose and gave me many miles of dependable riding. Glad you found a good older frame at a reasonable price. Big Name brand also. Nice space for batteries. Like the added plate where your old one ...
by speedmd
Jan 19, 2018 11:33 am
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

This entire thread reminds me why so many bike people have been also plane people (going WAY back....): Way back, before planes and bikes. Riding and flying are the same in ancient languages, and it was a tradition to give bird names to the best horses. Interesting derivation in the language. I alw...
by speedmd
Jan 18, 2018 10:34 pm
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

I ride my circa 1150 gram (54) full carbon frame cross bike on some well worn rocky bike trails also with many of the mtn bike group in the fall. Not racing any longer, but still can stay with many of the fast guys on the climbs. Bombing the down hills, is difficult to stay with them unless it is so...
by speedmd
Jan 18, 2018 10:40 am
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

Now that we are deep into the armchair failure analysis :lol:, I am not too sure it is a weld void or over weld type defect. To me it looks to be a classic hi weld bead angle causing stress concentration at welds edge in the tube. A bit of finishing with a hand file or grinder as done on the old sch...
by speedmd
Jan 18, 2018 12:15 am
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

If you're re-welding aluminum that's already been welded and heat-treated, you've already lost the game. Is that frame even heat treated? May not be. Do we even know what alloy it is. Certainly a can of worms. Regardless, welding requires proper bead formation, weld prep and correct amounts of pene...
by speedmd
Jan 17, 2018 7:24 pm
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

..... Carefully drilled 3.2mm holes and pop-rivets don't. It's why they use pop-rivets to hold aluminium planes together. Hummm......Looks like I will have to dig deep into the ole tool box and look for my pop rivet gun. :D Thanks for posting the crack photos. It lived it's life. Looks to be much t...
by speedmd
Jan 17, 2018 11:09 am
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

Don't band aid the frame. If you want to just fix it, you want to weld it and add lots of material (fillets) to cover much further out onto the tubes. I would fold a section of aluminum sheet and add it as a gusset also that connects the top down and head tube to it also. Many years ago they learned...
by speedmd
Jan 15, 2018 10:54 pm
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 1982

Re: Potential Catastrophic Frame Failer Averted ….sort of.

Well, that is not catastrophic failure. It is progressive, and with frequent inspection it could probably ride safe until the springtime. Are you going to put his kids through college when he is gone? :roll: Seriously? Did you take out life insurance on him? :lol: Fix it or park it. No one should e...
by speedmd
Jan 15, 2018 1:50 pm
Forum: General Discussion
Topic: Wireless Connection from House into Garage
Replies: 7
Views: 196

Re: Wireless Connection from House into Garage

I just ordered a range extended for my wifi. Hoping it works in my dead spots.