[s-cars] Bypass valve thoughts. . .? Random Materials thoughts

[chris chambers]

I remember reading some years ago a story about a motor that was made
out of a plastic that had metal sleeves in it. Maybe it was a ceramic
block with steel sleeves....

Anybody else remember this? I think it was in popular science.

Chris
--- Trevor Frank <tfrank at symyx.com> wrote:
>
> I always thought that aluminum was a bad choice for a cylinder head
> and
> cylinder case/cylinder bores.  Because of it's high thermal
> conductivity
> the efficiency of the motor is very limited, it's high thermal
> expansion
> can play havoc also.  Cast iron or better yet ceramic's seem to be a
> better choice.  Coating an aluminum head with ceramics as long as you
> have a cast iron block may be a second choice, I have and I know
> others
> on the list have experimented with this on head's and piston's even
> exhaust ports.  I remember years ago some company was selling a
> nearly
> all ceramic motor, in passing I wonder what ever happened to the move
> to
> more ceramic parts in motors.
>
> -----Original Message-----
> From: Ned Ritchie [mailto:Q at IntendedAcceleration.com]
> Sent: Wednesday, October 01, 2003 10:56 PM
> To: S-Car-List at audifans.com
> Subject: RE: [s-cars] Bypass valve thoughts. . .?
>
> Lehmann's response was simply:
> "The boost is too low"
> ============
>
> Yes, I thought about that too.  What did he mean?
>
> Well upon examination and investigation here is further info:
>
>    These engines use the all aluminum block.
>    High boost will create too much heat for the aluminum.
>       Ruf's modified aluminum engines are limited to 17 psig.
>    Boost was also limited to 17 psig in this Audi engine,
>    BUT the turbo was sized for Volume at that pressure
>
>    Now the intercooler was a bathtub in size, and if the pressure in
> the
> intercooler was all bled away at each shift it would all have to be
> pressurized again before power would be reestablished.  I speculate
> that
> the pressure spike could be absorbed by the gigantic intercooler too.
>
> Ned
>
>
> -----Original Message-----
> From: Mihnea Cotet [mailto:mik at info.fundp.ac.be]
> Sent: Wednesday, September 24, 2003 2:45 AM
> To: Ned Ritchie; S-Car-List at audifans.com
> Subject: Re: [s-cars] Bypass valve thoughts. . .?
>
> Huh? I'm sure curious to hear Herr Lehmann's reasons for that, though
> he
>
> must know better than ***ANY*** of us here...
>
> Mihnea, kneeling for Heinz Lehmann and Peter Link :-D
>
> At 02:26 24/09/2003 -0700, Ned Ritchie wrote:
> >Over the years Heinz Lehmann built several 450 to 530 hp engines for
> >Frank Beddor's Sport quattros in Minnesota.  On these engines he
> also
> >REMOVED and blanked off the Sport quattro bypass valve.
> >
> >WHY?
> >
> >This is something to banter about on the list for awhile before I
> give
> >Heinz Lehmann's reason.
> >
> >Ned
> >
> >--
> >
> >
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>
>
>
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