Ferrari Mailing List: Re: Carb 308 ignition timing

[Hans E. Hansen (FList]

Right.  That's what I was saying - the extra points only
were in the circuit at idle to retard the timing for
emission purposes.  They can be eliminated with
only slight degradation in idle smoothness.

Hans.

On 7/9/07, Rick Lindsay <rolindsay [at] yahoo.com> wrote:
> I had always believed that the dual-points setup was a
> trick for the US-spec cars to reduce emissions at
> idle.  Perhaps not.  We learn.
>
> rick
>
> --- "Hans E. Hansen" <FList [at] hanshansen.org> wrote:
>
> > Peter, Rick, etc:
> >
> > Don't forget that GT4's have (or in many cases
> > *had*) a
> > switch hooked to the throttle linkage that enabled
> > an
> > extra set of point that retarded the timing by 10deg
> > at idle.
> > Since you are now all electronic, you can either
> > figure
> > out a way to retard at idle (probably not
> > necessary), or
> > set the timing at the factory setting minus 10deg -
> > which
> > is what I have done.  So your current setting is
> > probably
> > near optimum, actually......
> >
> > Hans.
> >
> > On 7/8/07, Peter Pless <ferrarilist [at] pless.com.au>
> > wrote:
> > > To what end, Rick? Measure what? I know what it
> > usually is...with and
> > > without anti-pollution setting, as per the manual.
> > I was just wondering if
> > > there are benefits or downsides to it. I'm not
> > scientific enough to
> > > understand what goes on in a combustion chamber
> > with changes to timing.
> > > Oh...i have 10:1 pistons too...if that adds
> > anything to the conversation.
> > >
> > > -----Original Message-----
> > > From: Rick Lindsay [mailto:rolindsay [at] yahoo.com]
> > > Sent: Monday, 9 July 2007 12:03 PM
> > > To: Peter Pless
> > > Cc: 'The FerrariList'
> > > Subject: Re: [Ferrari] Carb 308 ignition timing
> > >
> > > Our Friend Peter Henrys there in Melbourne also
> > has a
> > > 308GT4 of similar age.  Perhaps you could make
> > some similar measurements
> > > with Peter?
> > >
> > > rick
> > > --- Peter Pless <ferrarilist [at] pless.com.au> wrote:
> > >
> > > > Thanks Rick.
> > > >
> > > > All the anti-pollution gear is removed. It was
> > just a point of
> > > > reference. So it doesn't seem to MIND the
> > 12deg....and if it's not
> > > > uncommon, then I'm worrying about nothing.
> > > >
> > > > Peter
> > > >
> > > > -----Original Message-----
> > > > From: Rick Lindsay [mailto:rolindsay [at] yahoo.com]
> > > > Sent: Monday, 9 July 2007 10:55 AM
> > > > To: Peter Pless
> > > > Cc: 'The FerrariList'
> > > > Subject: Re: [Ferrari] Carb 308 ignition timing
> > > >
> > > >    Peter, my MGB is timed at 10 degrees BTDC at
> > 600rpm idle and can
> > > > advance as much as 20 degrees under operating
> > conditions.
> > > >    In your line, "they've set it up at 12deg
> > BTDC. I know usually it's
> > > > 5deg or so, and the aussie spec pollution
> > requirement is actually
> > > > 1-2deg ATDC."
> > > > is interesting.  My MG idles at 10 degrees BTDC
> > with the vacuum
> > > > advance operating so that much advance is not
> > uncommon.
> > > > HOWEVER, the retarded spark
> > > > may be a little 'greener'.  I'm guessing here
> > but what other reason
> > > > might there be for, "...and the aussie spec
> > pollution requirement is
> > > > actually 1-2deg ATDC."  If you have to pass an
> > emissions test you may
> > > > have to retard the spark to pass then reset it
> > to operating condition.
> > > > Here in Houston we have all kinds of emissions
> > tests BUT there are no
> > > > tests for antiques - defined as 25 years and
> > older.
> > > >    Good luck.
> > > >
> > > > rick
> > > >
> > > >
> > >
> >
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