How do you tune an ECU without knock control

[Bernd Felsche]

Bruce tapped away at the keyboard with:

> I guess some adults do believe in fairy tales.
> Check out rod bearing wear, oil break down, and the like.

I don't really feel like pulling down a perfectly-good engine to
check rod bearing wear.

Oil breakdown is more of a problem because of consistently-high
temperatures (between 95 C and 135 C). That's one reason to use
synthetic which lasts the usual change interval (15,000km).

> I put well over 200,000 miles on my LG4 Firebird, without a problem, and
> that included hundreds of 600' and 1/4 mile passes, without so much as
> taking a valve cover off (other then to install 1.6 rockers).  I did a
> timing chain at 160K miles for grins.  I put 90K miles on a 1500cc 155HP
> Fiat, and the bearings, rings pistons etc, were like new, reinstalled the
> old rings, and new bearing and went another 90K miles.  I won't bore you
> with all of my customers cars (when I used to do mechanical work).
> Anyone that indorses running trace or tip in detonation, oh never mind.....
> Bruce

Just because it works without noticeable knock, doesn't mean it
won't work better with light-knock. (Doesn't automatically mean
it'll survive knock, but that's another issue.)

> ----- Original Message -----
> From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, October 03, 2001 8:51 PM
> Subject: Re: How do you tune an ECU without knock control
> 
> 
> > Bruce tapped away at the keyboard with:
> > > So they are writting fairy tales for adults now, how interesting. <g>
> > > And to think some scoff at the little guys around here.
> >
> > Nothing wrong with "light-knock". My car's had it since new; now
> > over 240,000km without any damage due to knock.
> >
> > These fairy tales are recognized Engineering practice. (At least
> > according to a number of SAE papers.) Knock will start to do damage
> > if it's severe enough to strip the boundary layer off the surface of
> > the metal, allowing direct contact between the burning gas and the
> > metal. The boundary layer usually insulates the surface from
> > temperature and velocity extremes.
> >
> > > From: "Stephen Webb" <swebb at netlab.uky.edu>
> > > > This is normal
> > > > and actually enhances [economy/power]"  blah blah, your engine
> > > > is designed to tolerate this for brief periods, blah blah.
> >
> > --
> >  /"\  Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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> >
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-- 
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