On Mar 6, 7:58 pm, John_H <john4...@[EMAIL PROTECTED]
> wrote:
> the_dawggie wrote:
>
> >I'm curious about battery life on SI verses CI engines. On a diesel
> >you hit the thing
> >with around 70 amps for glow plugs for near 10 seconds before
> >starting, then I'm
> >not sure on the current for the starter, however the initial stroke is
> >doing 22:1
> >compression - of course the next stroke is more air spring.
> Most diesel starters have reduction gears, which significantly reduces
> the load on cranking. Glow plug current isn't particularly severe
> compared to cranking current... which is what normally kills 'em.
> Likewise high underbonnet temperatures and vibration (or an
> overcharging regulator).
Agree, overcharging, or something however tiny it be, drawing current
from a discharged battery will too over time.
My diesel battery gets vibrated though :-)
> Apart from their needing a larger capacity battery to start with (to
> handle the glow plugs) I've never found any significant differences in
> battery life with diesels. Those with 24 volt systems last much
> longer than anything else.
I'm unsure (would have to check the wiring diagrams) if the glow plugs
are turned off if cranking while they are still on. If not, then there
would
be load of both starter and plugs.
I don't even wait for them in summer - just go for it (I expect
that was the reason I worked out they were all broken when winter
came, which they were :-(
Yup, 24V setup I would expect to be better. Much better load
distribution
on the battery cells.
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