Jarred et al,
Attached is a scan from page 120 of the June, 1999 issue of EXCELLENCE
magazine. This is the ad for supercharging the 911 engine. The ad speaks for
itself. I have no idea if they are still produced, etc, since I've been away
from Porsches for ten years now..
I think of supercharging as 'forcing' the fuel/air mixture into the combustion
chamber rather than 'improving' the means by which it flows. Just as power is
increased with higher compression, more efficient cam(s) dependant upon the
tuners desire, improved induction and exhaust, etc; turbocharging and
supercharging achieve those results by 'stuffing' the combustion chamber with
more material to burn...
As for achieving tremendous power/engine size ratio's, just look at the 750
horsepower developed in a normally aspirated 2.7 liter formula 1 engine.... Of
course, that's at 19,000rpm: hardly suitable for the daily commute to work..
Carl
----- Original Message -----
From: jarrid_gross@earthlink.net
To: Wiencek,Thomas ; Carl McLelland ; alpines@autox.team.net
Sent: Wednesday, February 11, 2009 7:55 AM
Subject: RE: [Alpines] 435 HP 911 Porsche naturally aspirated six-cylinder
boxer engine
Tom,
1.2hp per liter is not such a big thing anymore.
You can take a very built rootes 1725 and make close to 100 bhp/liter
(175hp).
The new Acura RSX makes a mfgr specified 120 bhp/liter in stock form.
http://www.sportcompactcarweb.com/roadtests/0107scc_acura_rsx_type_s/index.
html
There are guys out there building 11k motors in the 150+ bhp/liter.
Basically N/A engines are limited to power output proportional to
displacement.
To get higher HP numbers, you need to do one of two things (or both).
1) Make more torque at a given RPM, which is done typically with
compression.
2) Make the same or similar torque, but at higher RPMs.
Porsche has employed interesting ways to make power, one they were one of
the first
to use tuned induction systems, the other is they have very free flowing
heads and ports.
When cammed to produce power in the 8000+ RPM realm, hitting 120bh/liter is
pretty easy.
Reliability is the main consideration atbhose power levels.
Find out the model and year, or at least the displacement and I'll see if I
cant find you
some data on the engine.
Jarrid
-----Original Message-----
From: "Wiencek, Thomas"
Sent: Feb 11, 2009 6:54 AM
To: Carl McLelland , jarrid_gross@earthlink.net, alpines@autox.team.net
Subject: RE: [Alpines] 435 HP 911 Porsche naturally aspirated six-cylinder
boxer engine
What I am really interested in is more information about this engine.
Getting 1.2 HP per liter on a naturally aspirated engine is amazing. I did
find that the HP is rated at 7600 RPM which helps but there must be some
interesting technologies on this engine. Even where to find information on
the 415 HP earlier engine would be appreciated.
Thanks.
Tom
[demime 1.01d removed an attachment of type image/jpeg which had a name of
Porsche Supercharger-2.JPG]
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