[s-cars] Timing belt vs Gears vs Chain

[Gabriel Caldwell]

When you are putting a V8 in to a B chassis, every millimetre counts.
Read this:
 
http://www.roadandtrack.com/article.asp?section_id=3&article_id=913&page
_number=4

Fourth paragraph.

Gabriel Caldwell


-----Original Message-----
From: Joseph Pizzimenti [mailto:pizzoman at yahoo.com] 
Sent: June 21, 2004 1:34 PM
To: Gabriel Caldwell; Tom Black; Dave Forgie;
Eric_R_Kissell at whirlpool.com
Cc: quattro at audifans.com; s-car-list at audifans.com
Subject: RE: [s-cars] Timing belt vs Gears vs Chain

So...this engine chain is significantly narrower than
the 4.2L timing belt?

Joe
'03 Evolution with Kevlar timing belt

--- Gabriel Caldwell <gabriel at ts.bc.ca> wrote:
> Just to give a bit of context to that information;
> the reason Audi went
> with a chain on the B6 S4 was to shorten the engine
> enough to fit in the
> engine bay.
> 
> Gabriel Caldwell
> 
> 
> -----Original Message-----
> From: Tom Black [mailto:tblack5 at cogeco.ca] 
> Sent: June 21, 2004 1:25 PM
> To: Dave Forgie; Eric_R_Kissell at whirlpool.com
> Cc: s-car-list at audifans.com; quattro at audifans.com
> Subject: Re: [s-cars] Timing belt vs Gears vs Chain
> 
> Give me a chain any day. Many manufacturers are
> reverting to timing
> chains,
> among them Audi in the NeuS4 V8. The new Mazdas,
> which means Ford may be
> just behind them. I have never heard of a chain
> breaking or stretching
> sufficiently to even make a measurable change to the
> timing. I would
> think
> that one could not say the same for a timing belt.
> The Porsche 911 air
> cooled engines had an abnormally long timing belt
> with no problems with
> stretch that I am aware of, and that includes the
> 3.0l RSR engine, with
> which I have more than a passing knowledge, having
> worked as #1 mech for
> a
> racing team for four years (73 - 77).
> My $0.02.
> Tom Black.
> 
> ----- Original Message ----- 
> From: "Dave Forgie" <forgied at direct.ca>
> To: <Eric_R_Kissell at whirlpool.com>
> Cc: <quattro at audifans.com>;
> <s-car-list at audifans.com>
> Sent: Monday, June 21, 2004 11:25 AM
> Subject: [s-cars] Timing belt vs Gears vs Chain
> 
> 
> > Gentlemen:  There is nothing wrong with the
> toothed rubber timing
> belt.
> It is
> > light. Is only one moving part. It is relatively
> inexpensive.  Gears
> or
> chains
> > are heavier.  Have more moving parts and would be
> much more expensive.
> Do
> you
> > think a chain wouldn't wear and break (into many
> little pieces of
> shrapnel)?
> > Do you think gears (if you could figure out a way
> to span about 18
> inches
> with
> > them) wouldn't wear and have all sorts of "lash"
> problems (it would
> give a
> > whole new meaning to "variable valve timing" (it
> would be randomly
> variable -
> > always a good thing (NOT!))).  Rubber timing belts
> need to be changed
> before
> > they fail and they need to be protected from
> outside damage.
> >
> > This debate should not be about the timing belt. 
> It should be about
> protecting
> > the timing belt from damage if/when the serpentine
> belt
> breaks/disintegrates.
> >
> > Dave F.
> >
> > Eric_R_Kissell at whirlpool.com wrote:
> >
> > > "Calvin & Diana Craig" <calvinlc at earthlink.net>
> wrote:
> > >
> > > >Of course all this would be solved if the damn
> manufacturer wasn't
> too
> > > cheap
> > > >to use a chain or timing gears in the first
> place.
> > >
> > > Which opens the door for a debate as to why Audi
> (& Volkswagen)
> chose a
> > > timing belt rather than a chain or gears.
> > >
> > > What are the advantages of a timing belt over
> other options?
> > >
> > > What are the disadvantages of a timing belt over
> other options?
> > >
> > > In my job that we have to balance all of the
> design criteria and
> cost is
> > > only one consideration. Has Audi chosen the
> timing belt alternative
> for
> any
> > > reason other than cost? Is the cost actually
> less than other
> alternatives?
> > >
> > > Eric
> >
> > _______________________________________________
> > S-CAR-List mailing list
> > S-CAR-List at audifans.com
> >
> http://www.audifans.com/mailman/listinfo/s-car-list
> >
> 
> 
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