diesel valve springs

[Larry" <rocco16v@netzero.com (Larry)]

Drew-
  What leads you to believe a Diesel has a more radical cam profile?  I
can't say it doesn't, but if that IS true, then the valve springs may indeed
be of a higher rate than the gassers.
But, somehow I don't buy into that; since a radical cam only benefits an
internal combustion engine at "higher" rpm, the Diesel, with its lower
operating rpm, would seem to be better suited to a milder cam (and visa
versa).
BTW, the Diesel engine is throttled. You may have been thinking of something
else....
I'm off to watch the fireworks....

Larry




----- Original Message -----
From: drew <drew@dyermaker.cs.uoguelph.ca>
To: Larry <rocco16v@netzero.com>
Cc: Lisa Lutman <llutman@hotmail.com>; <scirocco-l@scirocco.org>
Sent: Thursday, July 04, 2002 5:23 PM
Subject: Re: diesel valve springs


>
> I'm not sure what you mean by milder state of tune overall, but yes,
> diesels do generally operate at lower rpms than gas engines.
>
> As far as spring rate goes 1.6 NA and TD motors do use different inner and
> outer valve springs than the 8V and 16V gassers.  As to spring rate, I'd
> have to go out to the shed and squash a few and compare them...  :)
>
> My guess is that due to a more radical cam profile (in part to support the
> 23:1 compression ratio of the indirect injection VW diesels) the diesel
> springs may well be more durable than their gasser counterparts. Somewhere
> I had diesel cam profile information, which I have misplaced, but there
> has to be a good deal of lift to maximize the amount of air in the
> unthrottled diesel's cylinders.
>
> If I find any data to support this theory I'll post it - in the meantime
> it's just conjecture.
>
> Drew
>
> Drew MacPherson
> '84 Wolfsburg Edition Scirocco TurboDiesel
> '99 Vento TDI
> '87 Jetta GLI pretender winterbeater
>
>
> On Thu, 4 Jul 2002, Larry wrote:
>
> > I don't have any specific knowlege, but would think this would NOT be
the
> > case.  I base my opinion on the fact that diesels generally are a much
> > lower-rpm (actually in a milder state-of-tune overall) engine than
gasoline,
> > and have no need for stiffer springs(or springs that are even equally as
> > stiff..)
> >
> > Larry
> >
> > > I've heard that you can use diesel valve springs in a VR6 when doing
cams
> > > and that they're stiffer and cheaper than aftermarket ones. I'm
wondering
> > if
> > > this can be done on a 16v if I put a 260/276 cam set up in my 2.0L.
Anyone
> > > know? TIA...
> > >
> > > Lisa
> >
> >
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>
>
>
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