FW: Bored engine in Rally car?

[JShadzi at aol.com]

--
[ Picked text/plain from multipart/alternative ]
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
>