[Diy_efi] Combustion temperature for max power

[Dave Dahlgren]

>From what I have learned on the dyno over the years is 1350 for a N/A piston
engine works well and 1500 to 1700 on a turbo high boost engine is common. That
N/A engine on a very long straight away ( Bonneville Salt Flats 5 miles) will go
to 1500 to 1550 once it stabilizes.. I have also found that is just as linked if
not more so to the timing as well. Advance the timing and it will get colder
until you go too far, retard it and it will heat up some. The problem with the
turbo seems to be that they are generally set up too rich for safety and timing
retarded too much for safety and the EGT is at the moon because the engine is so
"safe'.

Dave

Eric Byrd wrote:
> 
> It seems to me, not knowing much about the specifics of this topic, that
> having extremely hot exhaust gases is a symptom of inefficiency in your
> cycle.  Heat = energy lost.
> 
> Plus, I have heard there is a relationship between fuel mix and EGT,
> reliable enough that you can use it to diagnose fuel problems.  I have
> heard the optimum EGT is 1500 F, and that 1800 F is hot enough in the
> exhaust to denote cylinder temperatures hot enough to melt aluminum
> pistons.
>


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