Date: Mon, 15 Jul 2002 19:52:43 -0400
Reply-To: Christopher Berchin <ctb1@PEOPLEPC.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Christopher Berchin <ctb1@PEOPLEPC.COM>
Subject: Re: tiico's, subies and diesels oh my...
Content-Type: text/plain; charset="iso-8859-1"
> Chris wrote: "Note that all are approximations."
> --------------------------------
> Stan replys: Then why bother?
Chris counter-replies: Because approximations are the best you can ever
hope to have, even in the engineering world, until you actually build a
prototype and test it. It's good for A-to-B comparisons and prediction of
trends, if not exact numbers. For example, it shows how changing your tire
size will affect your accelerations, though not at the *exact* number of
g's. It will show you graphically how hugely a 240-hp Vanagon would stomp a
1.9 WBX like mine, and so on. Most of the world's creations were simulated
using approximations first. : ) Basically if you're thinking about
spending a lot of money on some sort of engine, this can help show you how
much bang you'd get for your buck.
Chris
----- Original Message -----
From: "Stan Wilder" <wilden1@juno.com>
To: <ctb1@PEOPLEPC.COM>
Cc: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, July 15, 2002 7:26 PM
Subject: Re: tiico's, subies and diesels oh my...
> Chris wrote: "Note that all are approximations."
> --------------------------------
> Stan replys: Then why bother?
>
> Stan Wilder
>
> On Mon, 15 Jul 2002 18:55:13 -0400 Christopher Berchin
> <ctb1@PEOPLEPC.COM> writes:
> > << I'm just curious if there is a definitive place to look for
> > comparisons on these engine conversions? >>
> >
> > I wouldn't call it "definitive," but I'm currently working on
> > finishing a
> > spreadsheet with graphical analysis of the 2.2 Subie, 3.3 Subie, 1.9
> > and 2.1
> > WBX engines. Basically I've plotted the thrust curves for each
> > engine in
> > each gear over the entire rev range. What I'm working on now is
> > adding the
> > effects of powertrain losses (i.e. frictional losses that are
> > internal) and
> > aero drag. I have it figured out, I just haven't finished it yet.
> > Once
> > done, I can post the graphs - right now, the only thing that really
> > "has it
> > all" is my comparison of the 2.1 WBX to the Subaru 2.2, but only for
> > top
> > gear. I have drag and powertrain loss effects only for fourth gear
> > for
> > those engines - what's left to do is to do the rest of the gears
> > and
> > engines.
> >
> > The whole thing is an Excel spreadsheet, so you can play with tire
> > sizes,
> > gear ratios, and dyno cuves to see what happens. Note that all are
> > approximations, but so far my 1.9 WBX chart says that I should top
> > out at
> > about 91 mph, and since the top speed is really 88 mph in reality,
> > that's
> > close enough for gov't work.
> >
> > If anybody wants the final results, drop me a line and I can send it
> > along
> > to you. Once I have something close to complete, I can upload the
> > graphs at
> > my Imagestation albums.
> >
> > To add more engines, all you would need is dyno data and gear
> > ratios. Punch
> > it in on the spreadsheet, do a little Excel work, and bammo - a new
> > comparison is born.
> >
> > Chris
> >
>
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