FW: Bored engine in Rally car?

[Livolsi, Stephane]

I agree with everything you said.  If I had the time/interest, I would
certainly be doing a lot more modifications to my 5ktq, (possibly including
boring/stroking) rather than just keeping it in good running shape.

Thanks for the dialogue, and thanks for sharing your experiences/knowledge.

Stephane

> ----------
> From: 	JShadzi at aol.com[SMTP:JShadzi at aol.com]
> Sent: 	April 9, 2003 9:36 PM
> To: 	Livolsi, Stephane; quattro at audifans.com
> Subject: 	Re: FW: Bored engine in Rally car?
>
> Stephane, I know what you're saying, but you're speaking in very _general_
> terms, how the apply to the I5 specifically is manifest in a range of
> significance.  The I5 is a very overbuilt motor, and assuming you're
> running along the same lines as the factory (rev below 8k rpm, no
> significant lightening of internal engine parts, etc), they are very
> reliable.  Probably the worst you could ever do on a street driven car is
> reduce the longevity from 300k miles to way lower, say 190k miles?  ;)
>
> Anyway, I5 engine parts are pretty affordable these days, so I say
> experiement away and have some fun, if you're not blowing things up you're
> not really getting enough power.
>
> Javad
>
> In a message dated 4/8/2003 11:30:33 AM Pacific Daylight Time,
> Stephane.Livolsi at investorsgroup.com writes:
>
>
>
>
> 	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
>
>
>
>
>