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

[Don Sauman]

Seems lean to me.
When the engine is stressed at WOT or under load, I wouldn't like to see 
an A/F ratio of more than 12:1. Leaner than that will send the exhaust 
temp high and it starts to spit out valves.
This is not worth the fuel saviing.

Don

Tim Marsteiner wrote:

>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?
>
>
>Thanks,
>Tim
>
>
>
>
>
>I have experimented and cannot get the 
>
>
>
>Does high EGT mean the exhasut valve is in danger?
>
>
>		
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