Re: Turning off your engine at red traffic lights
- From: "Dave Plowman (News)" <dave@xxxxxxxxxxxxxxx>
- Date: Sat, 06 May 2006 11:18:03 +0100
In article <cCUlhtvFIYkV-pn2-D8vy05gdspNM@localhost>,
Ian Johnston <ian.groups@xxxxxxxxxxxxxx> wrote:
Modern systems use a hybrid alternator-starter to do the starting, via
the belt drive. That makes it much smoother and less of a shock to
various systems.
It would be some belt drive to handle the torque. Most are part of the
flywheel.
As to how much energy it uses ... I reckon a warm restart takes about
2 seconds. The starter motor draws about 200A at 8V (battery voltage
drops during the start),
If it's dropping to 8 volts you have a problem. With a hot engine, just
over 10 is more like it.
so that's 3.2kJ. Petrol has a calorific value
of around 32MJ/litre, so those 3.2kJ would need 0.1ml at 100%
efficiency. Allowing a reasonable overall 20% efficiency for engine -
alternator - battery - starter and that's 0.5ml, or about one standard
drop of petrol.
--
*Hang in there, retirement is only thirty years away! *
Dave Plowman dave@xxxxxxxxxxxxxxx London SW
To e-mail, change noise into sound.
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