engine/turbo theory question

[larry leung]

Okay, what I meant is that a turbo, by recovering usually wasted heat energy from the exhaust, is an overall more efficient pump than an externally driven hydraulic pump. You are correct, every machine looses energy due to frictional losses. Ideal (model system) ones do not.

LL - NY

------Original Message------
From: "James Marriott" <marriott at micron.net>
To: kris_j_hansen at yahoo.com, Lawrence C Leung <l.leung at juno.com>
Sent: October 19, 2000 3:06:52 AM GMT
Subject: Re: engine/turbo theory question


----- Original Message -----
From: Lawrence C Leung <l.leung at juno.com>
To: <kris_j_hansen at yahoo.com>
Cc: <tquattroguy at yahoo.com>; <rdeis at io.com>;
<quattro at audifans.com>
Sent: Tuesday, October 17, 2000 2:46 PM
Subject: Re: engine/turbo theory question


> I think kris is right. Most of the energy for a turbo comes
from exhaust
> heat, the drag it entails in backpressure is considerably less
than the
> recovered heat energy. The concept of an external hydraulic
pump can't
> recover the otherwise lost thermal energy. Hence, you are using
more
> energy than you gain.

The turbo uses more energy than it gains, too; every machine
does. What the turbo, or any other forced induction device, does
is allow you to pump in more 19000 Btu/lb hydrocarbons.

cu, James Marriott
'87 4kq (alias "late-B2 90q"), 180k
'89 200q (MC1, Procon10/no bag), 126k
Boise, ID, USA     http://www.webpak.net/~marriott/