go spin the cap on your truck. I bet you my truck the computer will reset
the timing right back. your not gonna blow up your engine or anything. there
are no detrimental effects. you would have to pull the distributor shaft out
and change it's position on the cam gear before you screwed anything up
----- Original Message -----
From: Shane Moseley <smoseley@ix.netcom.com>
To: <dakota-truck@buffnet.net>
Sent: Thursday, February 10, 2000 7:15 PM
Subject: DML: Re: Magnum ignition systems - how do they work?
> Aaron wrote:
>
> > nope,
>
> Nope what? I would love to spar w/ya on this subject my friend 8-)
>
> > you can spin the cap and the pcm will reset the timing back.
>
> This assumes that spinning the cap will 'set' it somehow - NOT!
>
> > More than
> > the crank position sensor is used.
>
> For timing - you are correct - there are LOTS of inputs to the computer
that
> affect the timing. But they are ALL based on the crank position as a
starting
> reference. The crank sensor alone would be enough but for driveability
and
> emissions reasons - other inputs are considered (like rpm, map, vss, etc.)
>
> > You'd be surprised what these pcm's do. I
> > watched the code list come up on the computer at a dealership, it
measures
> > just about everything you can think of, battery voltage, coolant temp,
> > voltage draw, vacuum, etc.etc.
> >
>
> Uh Yes. Purchase a scan tool and you can watch them at will. Even log
them
> w/some models. Right Bernd? 8-)
>
> >
> > ----- Original Message -----
> > From: Shane Moseley <smoseley@ix.netcom.com>
> > To: <dakota-truck@buffnet.net>
> > Sent: Thursday, February 10, 2000 10:51 AM
> > Subject: DML: Re: Magnum ignition systems - how do they work?
> >
> > > First off forgive me if this arrives in duplicate - I got pissed off
> > > when my web-based work email system possibly cancelled my last reply
to
> > > the list. I have re-subscribed using my home email addy
> > > (smoseley@ix.netcom.com). Ok so on w/the subject at hand...
> > >
> > > I would have to agree with V8dakLECC@aol.com on this one - the crank
> > > sensor is the only thing that is required to provide ALL ignition
timing
> > > to the magnum motors (V6 & all V8s). The PCM simply switches the
ground
> > > circuit on and off inducing current in the high-voltage windings of
the
> > > coil. The timing of which is completely controlled by the PCM
> > > (requiring a new program to change ANYTHING). It can do this due to
the
> > > resolution that the crank sensor provides - down to a few degrees of
> > > crankshaft rotation. For example suppose the computer is providing X
> > > degrees of timing at 2500rpm. If it decides to advance the timing 5
> > > degrees at 2500rpm - it simply toggles the ground circuit at X-5
> > > degrees. If it decides to retard the timing 5 degrees at 2500rpm - it
> > > simply toggles the ground circuit at X+5 degrees. All in the computer
> > > baby! The distributor does just that - distributes the spark to the
> > > correct cylinder. This is why moving the distributor can have very
> > > detrimental effects - surely you dont want to change the firing order!
> > > This potential mechanical 'error' as well as wasted spark energy are
> > > reasons why the distributor (obsoleted) has been replaced entirely
using
> > > direct-fire coil-on-plug setups like on most production vehicles
today.
> > >
> > > Questions? Send em - I try my best...
> > >
> > > Latr,
> > >
> > > Shane
> > >
> > >
> > >
>
> --
> '96 IndyRam w/lots of mods (mine)
> '96 IndyRam w/lots of options (wifes) - also a numbered (#142) "Track
Truck"
> '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle
> '68 Black Corvette Convertible 427 (For Sale)
>
>
>
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