Ferrari Mailing List: Re: Carb 308 ignition timing

[Hans E. Hansen (FList]

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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