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Re: [FlyRotary] turbo math
Them numbers are flat scary to my but I just read a chart
on a Navaho that gave a temp of 350 degrees at 40 inches on a hot day,
it didn't say what the temp was on a hot day.
Ken welter
Greetings,
I did some searching
around, and found the basic gas formulas at this
page-
http://www.pmel.org/HandBook/HBpage20.htm
For my measured
temps:
MAP / temp F /
RPM
18" / 105 /
3000
20" / 128 /
4225
30" / 167 /
5000
36" / 196 /
5500
40" / 214 /
5700
44" / 228 /
5800
It appears that at
my 36" MAP boost level, I have the same air density
that I would have at NA, on the same 90F ambient
day.
Unfortunately, this
air density is only part of the problem. I'm
guessing that exhaust backpressure is as much, if not more
of an issue. This leaves me still thinking that I'll need
5-6 psi of boost to break even with a good NA engine, but I'm
becoming more comfortable with those
figures.
Rusty (off to the
hanger to see if I can find a place for Mr.
intercooler)
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