Shoot, forgot to eliminate that pesky trailer....
Well, yes it is that simple. When using a turbo charger with a waste gate,
it keeps the pressure at the set ppoint of the waste gate. At boost pressure
that is. If you had a fixed volume, then the pressure would decrease, but
the pressure is not decreased because of boost. And yes the 2 turbo books
are good references, but not be all end alls.
flame suit is now on!
mayf
----- Original Message -----
From: "rtmack" <RTMACK@pop3.concentric.net>
To: "DrMayf" <drmayf@teknett.com>
Cc: "Rick Hammond" <r.hammond@sympatico.ca>; "Dan Warner"
<dwarner@electrorent.com>; "land speed" <land-speed@autox.team.net>
Sent: Tuesday, November 27, 2001 1:28 PM
Subject: Re: Cold Intake
> Mayf, list:
> Not quite that simple, because when you cool the air you also reduce its
pressure
> ("ideal gas law", Pv = rT). Hugh MacInnes book Turbochargers has a good
chapter
> on intercoolers, including how to calculate potential gains. Even
something on a
> patent-pending freon-refrigerated design (different from the "Rankine
cycle" we
> usually expect; uses a "jet" compressor, rather than one that is
> mechanically-driven. No parasitic engine power loss???)
> Good book.
> Russ Mack
>
> DrMayf wrote:
>
> > This is a large subject! Efficiencies on intercoolers can be very high,
80%
> > or more, but can never lower the exit air temperature less than ambient
air
> > temperature. In other words, if the air temp is 90 degrees and tyou are
100
> > percent efficient then that is a low as you can go. Unless you are using
> > water to air or some other heat transfder mechanism like CO2 for the
cooling
> > media. As to hp gains, losses, I think that horsepower goes up or down
as
> > air charge density changes. So If you run your motor on a dyno at
standard
> > conditions and then decided to see what the hp is at B'ville, then just
> > ratio the air charge densities (I "think"...this could be dangerous, me
> > thinking, that is). For example the air density ratio fro B'ville at
> > standard conditions is, again, I think, 0.882 so you would lose about 12
> > percent of your horsepower. Conversely, if your air charge density went
up,
> > then you would gain back that which was lost. I think this is all prety
> > calculable (is that a word meaning to be able to calculate?).
> >
> > mayf
> > >
> > > Does anybody have figures on hp gains/degree drop etc.?
> > > How much temp. drop do you get from a good air/air intercooler? (of
> > course that
> > > depends on ambient ranges)
///
/// land-speed@autox.team.net mailing list
/// To unsubscribe send a plain text message to majordomo@autox.team.net
/// with nothing in it but
///
/// unsubscribe land-speed
///
/// or go to http://www.team.net/cgi-bin/majorcool
///
///
|