2MC Capacitor & Lecky IGN
- Thread starter crusadersports
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Mick,
Just about any reasonable electronics shop will sell a suitable alternate, Jaycar, Dick Smith etc etc ( the value of the capacitor does not really matter, the bigger the value the more capacity, but more kicking will initially be required, the max voltage rating and polarity if applicable is important).
My bike is still in pieces, when it is back together, I will be using a 50 uF(micro farad), 400 volt capacitor, my diesel standby generator uses the same item, if the generators one dies I can grab the one off the bike to keep the house powered )
Just about any reasonable electronics shop will sell a suitable alternate, Jaycar, Dick Smith etc etc ( the value of the capacitor does not really matter, the bigger the value the more capacity, but more kicking will initially be required, the max voltage rating and polarity if applicable is important).
My bike is still in pieces, when it is back together, I will be using a 50 uF(micro farad), 400 volt capacitor, my diesel standby generator uses the same item, if the generators one dies I can grab the one off the bike to keep the house powered )
batrider
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If dead battery is disconnected first my original 2MC will work with an analog Boyer. You have to kick it like you mean it though. Or it will bite back.
Probably I should try and rebuild the 2MC some nice weekend this summer. It's been a long hard life for an electrolytic cap. Always been there -- part of the greasy blob on the right of the battery box -- so I hate to just remove it. I like the chain oiler too!
With old radios we put new caps inside the old cans and seal them back up with JB Weld. So I want to try it out on my blue guinea pig.
Russ
Probably I should try and rebuild the 2MC some nice weekend this summer. It's been a long hard life for an electrolytic cap. Always been there -- part of the greasy blob on the right of the battery box -- so I hate to just remove it. I like the chain oiler too!
With old radios we put new caps inside the old cans and seal them back up with JB Weld. So I want to try it out on my blue guinea pig.
Russ
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Josh Cox said:
It takes multiple kicks..... to get your leg in condition to finally kick it fast enough to actually make enough current to fire it up. The ignition is always on and the current is alway being drawn off like a fire hose dumping water out of a 5 gallon pail. Unless you are so lucky to have stopped exactically between points opening on a points system.
Even on a boyer, as soon as the first trigger turns on the drive transistor the flood gates are opened with surge of over 2 amps which will deplete the cap in very short order.
What do you think the TC of a 450uF @14v (if lucky) through a 4 ohm resistor(2 coils in series)...can you do electronics 101 math? = .00018 seconds and therefore 3 TC will deplete the cap to under 1.2 volts in .00054 seconds. You're a very fast kicker if you can beat that....I will not confuse this discussion with the inductive aspect of this equipment.
FWIW http://en.wikipedia.org/wiki/RC_time_constant
A cap does start to dicharge the instant the EXTERNAL load (which is the coils) is applied ... the INSTANT the points close or transistor is turned on.
The internal impedance of the cap is not the issue here as it relates to discharge through an EXTERNAL load.
Of course the power going back IN to the cap does helps keep the voltage up but the power is still being depleted very quickly.
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