[Diy_efi] A/F mixture, EGT and engine damage

[Michael Richards]

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.

-Michael

> 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
> RPMs).
> 
> http://www.superxtune.com/images/8320Cyl2_egt.jpg
> 
> 
> 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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