[Diy_efi] A/F mixture, EGT and engine damage
tmarstei at yahoo.com
Mon May 16 15:26:14 CDT 2005
Both EGT probes are exactly 3" from the cylinder
I have heard that going too rich can damage the engine
by "washing" the oil film off the cylinder walls. Is
there a safe lower limit on A/F or EGT ?
--- Michael Richards <michael at fastmail.ca> wrote:
> Your EGTs do sound a little high but I don't know
> where your probe is
> and I don't have a lot of motorcycle engine
> experience. If I had to
> guess I'd say that maybe you aren't running enough
> ignition advance.
> That mixture isn't what I'd characterise as too lean
> or too rich for an
> NA engine.
> > Some owners of my type of motorcyle have reported
> > burnt exhaust valves and cracked cylinder heads. I
> > have logged data running one of the standard
> > tunes showing peak EGTs >1500 F and A/F > 13.2:1
> > WOT. I have also recorded even higher EGTs (1663
> F) at
> > mid to low engine loads.
> > This page shows Avg EGT, Peak EGT and the number
> > samples at each operating "cell" in the map (TPS
> > RPMs).
> > http://www.superxtune.com/images/8320Cyl2_egt.jpg
> > Any opinions on which of the above conditions is
> > the most (if any) damage?
> > At mid to low engine loads do you need to be
> > with high EGT or should I just focus on richening
> > the higher engine load points?
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