RE: combustion chamber design, pent roofs etc.

["Nick Koleszar" <npk@domain.elided>]

> ------------------------------
>
> Date: Thu, 13 Jun 2002 22:55:15 -0400
> From: christian147@domain.elided
> Subject: Re: alfa-digest V8 #813
>
> I wish more tuners though like that, it would be easier to make a living,
> less real competition.  If you ignore velocity you are doomed to V.E.'s
> of less then 105% if you are lucky.  Use velocity for all you can and
> 130% is possible  (160% in theory).  Every dimension from the initial
> flair of the intake cone to the tip of the collector outlet is important
> if it is touched by the working gas. Every dimension is dependent on how
> the engine will be used.  Get it wrong, and you are driving a pig.
> Computers modeling helps greatly here.  Know of an affordable CFD package
> that will run on a small cluster?

Chris, at the risk of being too pedantic (is that possible in engine
design/tuning?), I think you'll find that the sentence should read, "Every
dimension from the area/space/volume within about (up to) 24 inches of the
intake to the end of the exhaust system is important."

nk

Nick Koleszar   koleszar@domain.elided
outgoing mail scanned for viruses by Norton.
------------------------------------------------------------------
1971 Alfa Romeo Giulia Super 2.0
1990 Alfa Romeo 75 3.0 QV
1993 Mini
1990-ish Rotax 125cc/Gbox kart
1926 Amilcar C6 (I wish....)
==================================================================
--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided