Sean Johnson wrote:
> First, the Haynes manual says that static timing "isn't practical" for
> electronic ignition engines. Any idea why this would be true?
Generally, when you static time something, you watch the points
and can learn the exact moment the points open. So to static time
something to 10 degrees BTDC, you fiddle around until you see
the points opening when the crank is at that setting.
With electronic ignition, there is nothing you can really watch
to see the precise moment the points open at "pushing the
car in fourth gear" speed.
> Second. The older engines are about 10 degrees BTDC, static or dynamic. The
> newer are about 2 degrees ATDC.
As mentioned, these timings are very similar, if you time at
idle the vacuum retard is retarding the timing quite a bit. If
you rev the engine (grab the throttle linkage) you'll see that
as soon as you open the throtle butterfly the timing goes
back to fairly BTDC.
> Does the timing between the pistons and valves allow either
> of these settings, or were the respective engines set
> differently?
It's the vacuum system that makes them different, especially
at idle.
--
Trevor Boicey
Ottawa, Canada
tboicey@brit.ca
http://www.brit.ca/~tboicey/
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