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heavy duty valve springs for my 16v head



There are two issues with HD valve springs.
One is to have a stiffer spring to allow higher revs and more aggressive
camshaft acceleration and still maintain control of the valve movement.
The second concern is valve lift. Typically the HD springs have fewer
coils so the coil bind height is less than a stock spring allowing more
cam/valve lift.
So, there is a lift value where you simply must go to HD springs to
prevent coil bind and severe cam lobe wear and parts breakage.
The downside of HD springs is more friction and more power to drive the
cams.
My 8V can control its 40mm intake valves to 7000 RPM with a 274 cam and
STOCK springs, so you'd need to have some really aggressive cams or plan
on turning alot of RPM to justify needing HD springs with the 16V's 32
mm intake (meaning lighter than 8V 40mm intake) valve.
just my .02
Dan

Allyn wrote:
> 
> actually it also depends on if you plan on raising the rev limiter or not.
> the whole idea of the added force is to keep the valves where they are supposed
> to be.
> Al
> 
> ----- Original Message -----
> From: "Kevin Collins" <kcollins1@socal.rr.com>
> To: "Scirocco List" <scirocco-l@scirocco.org>
> Sent: Thursday, August 22, 2002 1:31 AM
> Subject: Re: heavy duty valve springs for my 16v head
> 
> > Jeff Toomasson wrote:
> >
> > > Unless you're running a really radical cam setup >/= 276', do you
> > > really need them?
> >
> > Good question and one not everyone agrees on.  I believe Collin at TT
> > says HD are needed at 268+.. don't quote me on that.
> >
> > --
> > Kevin Collins
> > Huntington Beach, CA
> > '86.5 16V 2.0
> > '02 GTI 337
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
> 
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