Ferrari Mailing List: Re: Carb 308 ignition timing

[Peter Pless (ferrarilist]

It is to reduce polution. Aussie cars had it too.

The biggest difference  the electronic ignition made was below 3000rpma,
actually. Much more power and much smoother. It's just the advance at idle
that I found odd, but now that's been clarified.



-----Original Message-----
From: Rick Lindsay [mailto:rolindsay [at] yahoo.com] 
Sent: Monday, 9 July 2007 10:35 PM
To: Peter Pless
Cc: The FerrariList
Subject: Re: [Ferrari] Carb 308 ignition timing

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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