Re: [TCML] Help with capacitor + ignition coil project

[bturner@xxxxxxxx]

You are FAR better off to use smaller values and place a lot of them in
parallel, this increases instantaneous current delivery and doesn't stress
the caps as much.




> Actually, today 575 farads is no big deal for the new super caps. Someone
> recently listed some used super caps rated 2600 farads at 2.7 volts for
> only
> $10 each. You could wire enough of these in series to get enough voltage
> to
> turn the starter but it would get kind of expensive, even at $10 each, to
> wire enough in series/parallel to get enough capacitance and voltage. For
> instance, 5 of them in series would give you 13.5 volts but cut the
> capacitance to 520 farads, which might be close enough to the 575 farads
> that was figured earlier, if it is accurate. I didn't check. Auto
> batteries
> typically measure 13.8 volts when fully charge, by the way.
>
> If you wanted to try something like this, you would have to be extremely
> careful to limit the voltage because the super caps are very sensitive to
> overvoltage and will die. So, you would need to build a charging supply
> for
> the caps that was limited to an absolute maximum of 13.5 volts and it
> would
> most likely be much better to leave some room for error and limit it to
> less
> than this.
> Paul
> Think Positive
>
> On Mon, Oct 10, 2011 at 1:34 PM, mike hollingsworth
> <megavolts_61@xxxxxxxxx>wrote:
>
>> To put a little more into what Brandon said,   one must think about what
>> is
>> required to crank a starter motor.   A typical car battery can provide,
>> for
>> example 840 cold cranking amps @ approx. 14.6V.  This means for a short
>> duration, this would amount to more than 12.2kW of power.  If it takes 5
>> seconds(just a number to work with),  this would amount to a capacitor
>> that
>> would be able to store about 575 farads!  It is possible that it doesn't
>> take but a second or two to get the car started, but you get the idea.
>>  Those jump packs Brandon mentioned are great, but I have a battery
>> booster
>> pack and it is NOT a capacitor.  It is a sealed lead acid battery.
>> Mike
>>
>>
>>
>> ________________________________
>> From: Brandon Garretson <garretsontech@xxxxxxxxx>
>> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>> Sent: Thursday, October 6, 2011 6:36 AM
>> Subject: Re: [TCML] Help with capacitor + ignition coil project
>>
>> I dont wish to discourage anyones creativity here and speaking from a
>> mechanics point of view;
>> Power to the coil is all well and good but from where would you obtain
>> the
>> several hundred amps required to engage the starter and turn the engine
>> over
>> several times in order to start it?
>> That would require one hell of a large cap, like say, a car battery.
>> Just the alternator turning fairly slowly creates enough juice to power
>> the
>> ignition, thats why cars (manual trans) can be push-started.
>> Just wanted to point that out now because odds are somebody would point
>> it
>> out later.
>> There is an existing device called a jump-pack that can generally create
>> ~1000 amps.
>> Im fairly certain it operates in a similar fashion to what you are
>> proposing
>> but creates a more desireable outcome.
>>
>>
>> http://www.amazon.com/Quick-Cable-604050-WSL-RESCUE/dp/B002YORJTK/ref=dp_return_2/190-7458553-3559110?ie=UTF8&n=15684181&s=automotive
>>
>> Maybe there is some way you can put a twist on the concept.
>> Or hell, buy one for 80 bucks, pull the guts out, build your own case
>> and
>> call it yours.
>> Just remember to remove the Made In China sticker.
>>
>>
>> >
>> >
>> >
>> > >
>> > > Hey guys, I have an idea for a science fair I plan on entering this
>> > > spring.It will involve capacitors, and a few simple car parts.I
>> really
>> > > need help with this because my knowledge of capacitors sucks...so if
>> > > anyone would be able to help send me in the right direction I would
>> > really
>> > > appreciate it!email me at b-u-r-t-o-n-boy@xxxxxxxxxxx if your
>> > > interested!(basically my idea is when you have a half dead car
>> battery
>> > > that wont start the car, you can charge up a capacitor to send
>> enough
>> > > power to the ignition coil.... kinda like a flash in a camera)
>> > > thanks! :)
>> > >
>> > _______________________________________________
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>> > >
>> > >
>> >
>> >
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