Don't have the curves even for the factory V8 that I have let alone an SD1,
but a typical 4-cyl could have around 24 degrees centrifugal advance PLUS
another 20 degrees vacuum advance, depending on spec. The factory car has
both advances, so I wouldn't be surprised to see similar figures.
PaulH.
----- Original Message -----
From: Opstal, Lex van <agopstal@huygmetaal.nl>
To: 'RoverNet Mailing List' <rovernet@lyris.ccdata.com>
Cc: TR8 List <tr8@mercury.lcs.mit.edu>; MGV8 list <mgb-v8@autox.team.net>
Sent: Friday, October 20, 2000 7:13 PM
Subject: Advance curve V8 engines
> Steve,
> That is exactly what I mean.
> From the manual and several other sources I seem
> to understand that the maximum mechanical advance for the
> the 3.5 SD1 whether or not modified should be 22 degrees BTDC.
>
> That would be the figure for a efficient 4-valve engine so I'm puzzled
> and therefore I asked about real experiences proven on the dyno
> or chassisdyno what the actual advance figures should be.
>
> Hope there will be some more comments on this subject.
>
> Lex van Opstal.
>
>
>
> -----Oorspronkelijk bericht-----
> Van: steve bridge [mailto:slbridge@hotmail.com]
> Verzonden: donderdag 19e ktober 2000 19:51
> Aan: RoverNet Mailing List
> Onderwerp: Advance curve Vitesse/EFI
>
>
> Unless there is something unique about a 3.5, it should make more timing
> i.e. 36-40 degrees total @ 3500+ rpm.
> Two degrees equals 1/10 of a second in the 1/4 mile.
> I use a vaccuum gauge to find the most vaccuum and then go from there.
> Advance the timing until you get a ping going up a hill and then back it
> off.
> Most distributors add about 24 degrees of advancement to be added to the
> static ( 8 - 12 degrees depending on altitude)
> Rule of thumb: at idle, add two degrees to factory specs. for every
thousand
>
> feet of elevation.
> sd steve
>
> >From: "Tom Walker" <pheatsol@pheatsols.com>
> >Reply-To: "RoverNet Mailing List" <rovernet@lyris.ccdata.com>
> >To: "RoverNet Mailing List" <rovernet@lyris.ccdata.com>
> >Subject: [rovernet] Re: Advance curve Vitesse/EFI
> >Date: Thu, 19 Oct 2000 11:21:28
> >
> >Hey Lex
> >
> >I only know 2 figures that I go by all the time, they are 8 degrees BTDC
at
> >idle (800RPM) and 28 degrees at 4000rpm.
> >
> >Hope that helps.
> >
> >Tom Walker
> >Melbourne, Australia
> >1985 Vanden Plas
> >1985 Vanden Plas EFi
> >
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>
> _________________________________________________________________________
>
>
>
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