Ferrari Mailing List: Re: Carb 308 ignition timing

[Rick Lindsay (rolindsay]

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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