Maximum advance

[Dave Plummer]

More isn't better.  The more advance you have, the more the piston is
working against rising cylinder pressure on the upstroke.  What you want
is a peak cylinder pressure at a particular point in the downstroke that
provides the best leverage on the crank.  No more, no less.  If you
could somehow accomplish that with zero advance, you'd have the best of
all worlds.

- Dave

> -----Original Message-----
> From: Peter Matousek [mailto:pegoalf at yahoo.com] 
> Sent: Tuesday, July 10, 2001 3:30 AM
> To: diy_efi at diy-efi.org
> Subject: Re: Maximum advance
> 
> 
> As a backyard tinkerer I use to set the advance by
> idle as far as it begins to knock, then couple of
> degrees back. This gives you the best performance
> and economy. When you like to go further then use
> water injection - this way you can go almost twice
> the advance. Each car can handle diferent: my Pug205
> high compresion can go up to 15 deg BTDC, but after
> water injection to 28 deg BTDC - great power.
> 
> Peter
> --- 944Technologist <f_wilk at hotmail.com> wrote:
> > What is the maximum advance that is safe for a 4
> > cylinder engine? Does
> > anyone have a Timing Advance versus RPM graph for a
> > high performance 4
> > cylinder?
> > 
> > FR Wilk
> >
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> 
> 
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