[Diy_efi] A/F mixture, EGT and engine damage
michael at fastmail.ca
Mon May 16 15:08:30 CDT 2005
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
> 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 factory
> tunes showing peak EGTs >1500 F and A/F > 13.2:1 at
> 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 of
> samples at each operating "cell" in the map (TPS vs
> Any opinions on which of the above conditions is doing
> the most (if any) damage?
> At mid to low engine loads do you need to be concerned
> with high EGT or should I just focus on richening up
> the higher engine load points?
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