[Vwdiesel] hillbilly TUNING. ---- ( the Valve train )
swright at zuiko.sls.bc.ca
Tue Apr 12 10:20:14 EDT 2005
I'd say yes - when I checked mine cold, then later hot, after I got the tools, the
differences were similar to what is indicated in the book. I also rotated the engine by
hand after installing new discs, and re-checked, as in some cases, I've found them to
be still off a bit. I always aim for the large end of the range, since they wear tight.
On 11 Apr 2005 at 22:08, Rudy Petersen <petersenrudy at hotmail.com> wrote:
> I'd like to adjust mine hot. Do you think the steel and aluminum is still
> hot enough to make much difference in the expansion after you pull the VC
> and get into it?
> > -----Original Message-----
> > From: vwdiesel-bounces at vwfans.com
> > [mailto:vwdiesel-bounces at vwfans.com] On Behalf Of LBaird119 at aol.com
> > Sent: Monday, April 11, 2005 8:44 PM
> > To: vwdiesel at vwfans.com
> > Subject: Re: [Vwdiesel] hillbilly TUNING. ---- ( the Valve train )
> > >VW diesels are notorious for valve clearance deminishing with wear.
> > >SO ? well this lack of key in the camshaft ? ----- lets
> > us Hillbilly
> > Tuners correct >by moving valvelift a tad back --to the
> > optimum performance.
> > Actually you correct the diminishing clearance by adjusting
> > the valves with thinner shims.
> > > >Valves are opening sooner and sooner till they no longer
> > close. I ask
> > > Loren and >the other mechanicks to tell us if I am correct
> > ? (maybe I am bass
> > > ackwards ?)
> > > >
> > > >Hagar.
> > Yes, if the clearances are less then the duration is
> > extended. Only when
> > valve lash is zero or less will the valve not close, except
> > for bounce, etc.
> > This is remedied by reestablishing the proper clearance, not
> > advancing or
> > retarding the valve timing. If the lobe circle has no
> > clearance, advancing
> > or retarding fixes nothing.
> > Not that there may not be some merrit in miniscule advance
> > or retarding
> > of the valve timing but how much, which direction, is it
> > worth the risk of
> > bending valves... are all valid questions. I've leaned
> > toward the last one.
> > ;-)
> > > >
> > > >PS : make sure you have lots of valveclearance. ----mine
> > were fine cold
> > > --BUT >warm ?
> > > >one valve did not close. (1.5LNA)
> > > >
> > Cold settings are ONLY for assembly. All valve adjustment
> > are supposed
> > to be done on a hot/warm engine. Many engines DO permit or specify
> > clearances when cold. I believe the engine runs in a warm
> > state and that
> > is the best state to set the valve clearances. :-)
> > Loren
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> > Vwdiesel at vwfans.com
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