Re: [FlyRotary] turbo math
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)
Hey Rusty let me run this one by you.
I am planing to put a turbo on my coot and I plan to
install a huge waist gate that will be used a a dump valve to shut the
turbo down, also on the intake side I will have a bypass flapper valve
that will let cool fresh air in when the turbo is shut down, most
bigger turbo setups have these incase of a turbo failure.
With this setup you can have your cake and eat it to, use
the turbo when you need it but for economy cruise your better off
without it and your not putting unnecessary ware and tare on the
turbo, also a great safety factor as you will be coming down if you
ever lose a turbo and with this just kick it in bypass mode.
All of this shouldn't take up much space either.
Ken Welter
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