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
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