Ferrari Mailing List: Re: Carb 308 ignition timing

[Peter Pless (ferrarilist]

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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