FW: Bored engine in Rally car?

[Livolsi, Stephane]

Javad, I have a lot of respect for you, just from your posts it is clear
that you are knowledgeable and that you actually DO some of this stuff.

I hear what you're saying, and I'm certainly not questioning any of your
statements - which are along the line that bore/stroke modifications are
easily done to the I5.

But, the main point that I was trying to make is that you won't get
something for nothing.  If you want to increase your torque by increasing
your displacement, you are probably giving something up in longevity.  This
is based on what I see in motorsports - these guys run huge HP/huge torque
modified motors for  1 or 2 races, then they have to rebuild them.  It gives
them what they want, but they sacrifice something for it.

I agree that the bore/stroke/displacement considerations were as much
marketing considerations as engineering ones - which leads me to believe
that they would have designed the engine to appeal to the mass market, most
of whom want good performance and excellent reliability and excellent
durability, unlike us enthusiasts who want excellent performance and are
willing to settle for good reliability and good durability.

again, MVHO, willing to learn from others.

Stephane


> ----------
> From: 	JShadzi at aol.com[SMTP:JShadzi at aol.com]
> Sent: 	April 8, 2003 10:34 AM
> To: 	Livolsi, Stephane; quattro at audifans.com
> Subject: 	Re: FW: Bored engine in Rally car?
>
> Stephane, thanks for qualifying your inexperience.
>
> The "Audi engineers knew best" argument never flies with me, if Audi
> Engineers had their say on the end result of the product without
> consideration to the financial, marketing, sales, distrubution and
> ego/upper management factor, you think Audis would look anything remotely
> to what they have all along?  No, absolutely not.
>
> The bore/stroke/displacement considerations were as much marketing
> considerations as engineering ones.
>
> Anyway, Audi made boring and stroking an I5 very easy, FROM the factory.
> With bigger bore pistons and longer stroke cranks available basically off
> the shelf, it makes it a very simple development process.
>
> Plus, it works, in my experience the bigger displacement motors give up
> little in revving capability and gain much more torque than they already
> have.
>
> HTH,
> Javad
>
>
> >
> > Totally inexperienced wild a$$ suppositional flame bait here...
> >
> > I like to modify vehicles, and there are lots of things that I am
> willing to
> > do, sometimes because the engineering doesn't matter, and sometimes
> because
> > I think I can do it better than the engineer who designed it.
> >
> > However, when it comes to the bore and stroke of engines, I am willing
> to
> > accept that the engineers who came up with the specs for the I5 knew
> their
> > stuff and found the BEST balance between performance and longevity.  So
> if
> > you change the bore/stroke aspect, you will gain in 1 area and lose in
> the
> > other.  Another good example (besides the I5) is the droF 302 V8.
> > Absolutely bullet proof in stock configuration - especially the older
> > versions.  I know - I've had a few in my younger wilder days and could
> not
> > kill them, despite my youthful enthusiasm and lack of maintenance.
> > Since joining the Audi fold, I am very impressed with the longevity of
> some
> > listers' I5's, and as you mention, you don't hear of too many people
> messing
> > with the basic block.
> >
> > Just MVHO
> >
> > Stephane
> >
> > > ----------
> > > From:     Zsolt[SMTP:zsolt1 at telusplanet.net]
> > > Sent:     April 7, 2003 11:38 PM
> > > Cc:   quattro at audifans.com
> > > Subject:  Bored engine in Rally car?
> > >
> > > I am curious about the bored engine. How come hardly anyone seems to
> be
> > > trying to get more displacement out of Audis?
> > >
> > > Thanks,
> > >    Zsolt
> > >
> > > Ray Rollins wrote:
> > >
> > > >[ Converted text/html to text/plain ]
> > >
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> > > >
> > >
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>