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rick-l 06-24-2014 01:57 PM
Quote:
Originally Posted by nota (Post 8132735)
starters are surge type draw

why no capacitor like a fan or a/c uses
Because a starter is a series wound DC motor.

A capacitor is used on a single phase induction motor along with an addition winding to generate a rotating field to induce a current in the rotor (squirrel cage).

rick-l 06-24-2014 02:01 PM
Back to the original question..... Should I turn off the engine at a stop light?

dad911 06-24-2014 04:04 PM
Quote:
Originally Posted by wdfifteen (Post 8132197)
This is what I was looking for. Thinking back as far as I can remember:

Start, drive 1 mile - shut off
Start, drive 4 miles - shut off
let sit overnight
Start, drive 3 miles - shut off
Start, drive 5 miles - shut off
Start, drive 4 miles - shut off
Start, drive 100 ft - shut off
Wouldn't start anymore.
I was wondering if I was asking too much from the battery or if it should still have enough charge to crank the engine. Looks like the answer is the battery is on its way out.
I just put a remote starter in a Honda Pilot, and started it at least a dozen times while testing, that's with door lights, and other draws present.

Could also be your alternator/regulator not getting a full charge into the battery. Test them both is the simple answer. No rule of thumb for # of starts, too many variables.

porwolf 06-24-2014 04:37 PM
Quote:
Originally Posted by rick-l (Post 8132759)
Back to the original question..... Should I turn off the engine at a stop light?
Why would you do that? The added battery capacity savings would never be as big as the needed battery capacity to restart the engine. Plus you would suffer the added deterioration of the whole starter mechanism.

rick-l 06-24-2014 08:26 PM
Quote:
Originally Posted by porwolf (Post 8132981)
Why would you do that? The added battery capacity savings would never be as big as the needed battery capacity to restart the engine. Plus you would suffer the added deterioration of the whole starter mechanism.
I thought BMWs system that shuts off the car when it is standing still was pretty stupid until I looked at this and saw how little energy it takes to start a warmed up car and how quickly the energy is restored. It might actually save some gas if the starter is built to take it.

nota 06-24-2014 08:55 PM
Quote:
Originally Posted by rick-l (Post 8132757)
Because a starter is a series wound DC motor.

A capacitor is used on a single phase induction motor along with an addition winding to generate a rotating field to induce a current in the rotor (squirrel cage).
there are lots of DC caps
their use is for surge currents short hi levels
like starting a starter
but no car I have seen uses caps in a starter circuit

WHY ?

rick-l 06-24-2014 10:24 PM
What would a capacitor do? A starter motor is a big inductor you want to put current through to make a magnetic field.

Some small DC motors have capacitors hung on them to suppress the commutator noise.

wdfifteen 06-24-2014 10:34 PM
Quote:
Originally Posted by nota (Post 8133332)
there are lots of DC caps
their use is for surge currents short hi levels
like starting a starter
but no car I have seen uses caps in a starter circuit

WHY ?
My guesses are a starter isn't called on to have a long "run" mode. It's always in or just out of start mode, so it's built to handle large currents full time.
Or, since it doesn't start under load it doesn't have a big initial surge.
Or maybe a combination of the two.


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