Author Topic: Racer Resurrection  (Read 55838 times)

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Offline OldSwartout

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Re: Racer Resurrection
« Reply #160 on: April 15, 2018, 06:12:26 PM »
I'd be somewhat nervous with a 2.5 Ah battery, although it should last one race.  i used to run a standard 14 Ah  battery. It would run a full weekend - 4-5 practice sessions + 2 races, but that was about it.   
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline craig641

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Re: Racer Resurrection
« Reply #161 on: April 21, 2018, 05:29:56 PM »
I used, through last season, a 4ah battery.  There were too many races that I dnf'd because of a dead battery.  I realized that the few ounces I saved wasn't worth it if you don't finish.

Offline OldSwartout

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Re: Racer Resurrection
« Reply #162 on: April 22, 2018, 09:26:30 AM »
It seems to me that one of the Lithium-Ion automotive jump start batteries rated at 20,000 mah should work and they weigh less than a small lead acid battery.  They are less than $100 at Walmart, etc.  The issue would be vibration, I think.  They probably aren't designed for a high vibration environment. 
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline al_pritchard

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Re: Racer Resurrection
« Reply #163 on: April 27, 2018, 08:18:17 PM »
This is what happens when I start over thinking things.

Taking a gamble on the battery. Two coils, rev counter, and transponder shouldn't flatten the battery in race time. Calculations vs. reality...

Standard place to mount the battery would be under the seat/tank. But I started thinking, what if I mount them on the air dam on the forks? It's a super light set up, and moving them forward would keep them away from the heat. Would need to change the material the dam is made of. I did a quick mock up with a fome core and fiberglass. Feels stiff, and can always build for USCRA, and use carbon fiber.

What do you think? Am I mad? To risky?







Al Pritchard
Highlands, NJ

BS175 Racer

Offline hardy

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Re: Racer Resurrection
« Reply #164 on: April 27, 2018, 08:55:28 PM »
I like the idea and your thinking, but in real terms my thoughts would be from time to time race bikes do have unfortunate accidents, so perhaps a more protected location were be better?

P.S, I have really been enjoying following this thread! Keep up the good work! banana

Hardy.

Offline OldSwartout

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Re: Racer Resurrection
« Reply #165 on: April 28, 2018, 08:16:47 AM »
I'm with Hardy, it's probably more vulnerable there, although a solid hit directly in front of the forks isn't as likely as side damage from sliding.  It is more isolated from engine vibration and heat there instead of mounted directly to the frame under the seat/tank and the access might be better.   Nice setup either way.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline BRT-GTR

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Re: Racer Resurrection
« Reply #166 on: April 28, 2018, 09:43:16 AM »
             I have no experience of automotive Lithium-ion batteries but have used them extensively for model aircraft flying.    Misused they can be dangerous  ------   ask Boeing about cockpit fires!!

         They must not be overcharged - can go on fire and cannot be extinguished, contain their own oxygen supply. 
       They must not be discharged below a set voltage (forget the figure) , that kills them.

       I assume automotive Li batteries have  built in electronics to prevent over charging/discharging..

   The ones I used came with dedicated chargers that cut off at the max voltage.  The onboard electronics would also shut off or go to low rate at a set discharge voltage.

       Used sensibly and fully aware of their characteristics, they are fine and have a great perfomance/weight ratio.      Make sure the intructions are understood and don't use normal lead acid chargers, unless instructions say you can.   I've seen many expensive model aircraft burned to a pile of ash because users didn't follow the instructions.
           Hope I haven't put you off,  bikes coming on nicely,    Brian.
« Last Edit: April 28, 2018, 10:04:48 AM by BRT-GTR »
Unspoiled by progress.

Offline bsracer

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Re: Racer Resurrection
« Reply #167 on: May 01, 2018, 10:57:28 AM »
My friend uses a Dewalt 14.4 drill battery. Not the lightest but easy to change out and will power all the tools we bring (drill and impact gun)! He typically has them charged and when he comes in he swaps new one every time. The newer batteries are much lighter. Might be tricky to adapt to still use the orig charger.

paul

Offline al_pritchard

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Re: Racer Resurrection
« Reply #168 on: May 01, 2018, 02:34:29 PM »
Hey Brian,

Yea, they can be a bit tricky - and flammable. But with a good charger, and charging protocols it should be safe. It's a LiFePO4 battery, slightly safer but still susceptible to fire.

So I'm going to try the airdam mount. But I also created a mounting plate for under tank, just in case....  ^-^

About the battery selection. I think I got the calculations close??? Otherwise I'll be looking for a deferent solution. But that's part of the fun, isn't it...  :o

With the Dyna S ignition and a 4.6 ohm stock coil we should get something in the 2 to 3 amp draw. With one coil reaching saturation when the other fires. The trick / hope is that the coil reaches saturation just before it fires. So we don't continue to pump energy into a fully saturated coil.

Interesting idea with the Dewalt battery Paul. And makes me think I may be ok with my selection. The older 14.4v ones were only 2.4 Amp.
Al Pritchard
Highlands, NJ

BS175 Racer

Offline al_pritchard

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Re: Racer Resurrection
« Reply #169 on: May 14, 2018, 04:15:15 PM »
Wiring harness weekend!

Not sure I completely understand how the wiring works - Dyna S, and the Coils. So if you spot something that looks off, please let me know.

Dyna S gets fed power on the RED wires (x2) to the positive post from the battery. The black and white wire from the the Dyna S, connect to the black and white wire on the coil. The blue wire on the coil connects to the positive post from the battery. In essence, two separate circuits. The Dyna S grounding through one side of the coil to the chassi. The coil grounding through the spark plug.

So it's ok to have the power side of the coil, and the power side of the Dyna S on the same pole from the battery?

The connectors are "Deans" connectors. If you ever raced RC cars, you probably encountered them.

Power comes off the battery into the "hot" side of the bus bar. The Coil, Dyna S, transponder, and tac all connect to the hot side. The ground/neutral bolts to the chassi. Then the ground side of the bus bar bolts to the chassi - safety wire will hold the bolts in place.

The tac will ground to the bus bar as well - need to tie that in yet. The white wire from the tac connects to the white wire on the coil.






Al Pritchard
Highlands, NJ

BS175 Racer

Offline al_pritchard

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Re: Racer Resurrection
« Reply #170 on: May 18, 2018, 10:15:54 AM »
Arts and crafts night! Or as I like to call it - Fun With Cardboard.

They dont seem to be required yet - but I seem to remember seeing that they are sugested. And it's probably a good idea.

I'm a little leary about drilling into the swingarm tube. But I think I should be ok drilling into the flat axle flange. Couple of cardboard mockups to get the shape right. Then on to aluminium. Add lightness, and .... still need to dril out the flange to mount it.





Al Pritchard
Highlands, NJ

BS175 Racer

Offline bsracer

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Re: Racer Resurrection
« Reply #171 on: May 22, 2018, 10:04:18 AM »
Looks good. Might not be mandatory before brake guard levers will be. You will need to cover the chain adjuster bolts that stick out. Just use a  short piece of fuel hose.

paul 

 


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