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> The PRIMARY reason for using
8.5:1 CR on the 550 with turbo’s is to manage
> the
TIT. Not Hp. They also do get a bit more
efficient.
>
> The gain in fundamental Carnot
efficiency from going from 8.5 to 10:1
> compressions is really
pretty small. This is an area with a rapidly
> declining rate
of return.
George,
thanks for that. I didn't
realize the efficiency curve is getting towards flat after 8.5:1
Does this mean that the only reason diesels are
22:1 is that it takes that much to get
the fuel to burn?
anyway, in regards to HP. In practice, if you
are TIT temp limited and you find a way
to lower the TIT then you can get more HP,
right? I haven't run my TSIO-550 yet
but I'm guessing it will be TIT limited, (or CHT
limited partly because of radiation from
the exhaust ....yeah I'm trying to get those heat
shields on....)
Colyn
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