[Vwdiesel] hillbilly TUNING. ---- ( the Valve train )
petersenrudy at hotmail.com
Tue Apr 12 01:08:02 EDT 2005
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. :-)
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