[DMCForum] ATTN: Jim S
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[DMCForum] ATTN: Jim S

My replacement PRV has what appears to be a timing scale transferred
from a DeLorean (has a notch at 13 degrees). Note that 10 degrees is
Volvo B27F spec (according to factory literature) as well as B27E and
Renault Z7V (R30). That notch has always perplexed me. Just to try
your theory out, I advanced to it before driving to Louie's house this
weekend. Valves didn't clatter a bit (93 octane) BUT:
- Power certainly wasn't increased
- Plugs came out white
- Engine ran too hot
I have Louie as an eyewitness.

With all due respects, your theory failed.

I think the fellow in Ohio who was marketing these engines transferred
DeLo timing scales to get then through emissions (are non-Lambda).
Timing to that notch has never produced anything but problems. He must
have gotten the initial index OK because engine performs like a champ
back at 10 degrees. Note that photographs of actual engines in Volvo
factory literature shows no notches on B27 timing scales. Am assuming
Renault Z7V is the same.

Bill Robertson

>--- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx>
> Isn't it ironic that the website that Martin told you to read months ago
> is now your vindication.  I knew you didn't read it!!!
> Unfortunately, the website does not say that advanced timing reduces
> horsepower.  It says that advance for the sake of advance is not
> necessarily a good thing.  He says that an engine that needs less
> can achieve more horsepower, not that an engine with less advance will
> achieve more horsepower.  The difference is that he was talking about
> similar timing advance over different engines, where you are talking
> about changing timing advance in the same engine.
> He also says that "Excessive advance is just as detrimental to power
> output ", but this is in reference to his earlier comment where the
> excessive advance caused knocking. 
> You may be right, but I still think you're wrong; and this website does
> not help your case in my opinion. 
> Jim
> On Sun, 04 Jan 2004 20:04:34 -0000 "content22207"
> <brobertson@xxxx> writes:
> > Re: Martin's Message #38006 on the List:
> >
> > As much as I hate to gloat:
> >
> > The third paragraph under the section titled "Ignition Timing"
> > clearly
> > states what I have maintained all along -- that too much ignition
> > advance can REDUCE horsepower. You can't simply rotate the
> > distributor
> > until the valves start to clatter, then back it off a degree or two.
> > That is NOT the point of optimum spark -- it is the point closest to
> > potential engine damage. Is a world of difference between the two.
> >
> > I'd have given David Baker MORE than a pound for pointing that
> > out...
> >
> > Bill Robertson
> > #5939
> >
> >
> >
> > 
> >
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