Supercharger info

[Francois Dion]

Dan Zorde wrote:

> Thanks for the info so far.  The intent is to generate as much boost as
> possible

If that is your only concern, why use a supercharger? Superchargers aremost
efficient at giving torque at lower regime and better throttle response
than turbos (the gap is closing tough). But max psi? The air temperature
rises very fast as speed increase. A centrifugal blower may be a better
option, but then why not use a turbo... Lancia did use the Volumex quite
a bit in different applications and tests and did get impressive power out
of their 2L, but the 2L itself was already a quite capable engine (dohc,
big sized valves, impressive airflow in the head etc). You will notice that
on cars such as the Delta S4 they opted for both to get better response
time and get gobs of torque and still go to a high psi, and when hp was more
important (race track) than low end torque (rallye) they used just the
turbo (Beta montecarlo turbo).

How much hp do you think you can squeeze? How much would you really
like? For what kind of application are you preparing your 850? I have a
Fiat 850 myself and the tought of a Fiat Uno Turbo engine has crossed my
mind... (I know one person who did a conversion like that and is found
from time to time in a Fiat x1/9 and even in a 127). Stock, that engine (1.3
and roughly the same weight as the 1L Fiat/Lancia Fire engine) puts out
a very conservative 110hp and 15 kgm due to a non agressive boost. A
proper boost management system (right now on the Peugeot turbo list,
we are investigating different options, including the Saab APC) would let
you go higher on the boost and you would be putting out some serious
power. Abarth did put a 1.1 that was stroked/bored to 1.3 in an 850 OTR
so it's not a sacrilege.

Ciao,
Francois Dion (francois at hyperreal.org)
--
Member: FLU #1722, PCNA
http://www.fortunecity.com/silverstone/zagato/101/launch.html
Alfa Romeo, Fiat, Lancia, Peugeot, Volvo, Solex