Re: ford KA tappets



Mrcheerful wrote:
not really.
the valve clearance affects the valve timing, a reduced clearance can
make a substantial difference to the opening/closing/duration.
mind you on a worn engine perhaps there will not be a noticeable (to
the driver) change.
some engines only have a few thou clearance in the first place, they
would go into negative numbers .

Most important too is what happens when the engine is hot. most
clearances are set cold. some engines will have the gap reduce when
hot, if you start with a smaller gap then the valve may be held open
a little when hot.

more regular oil changes help a lot on this little engine


.



Relevant Pages

  • Re: pre-stretched chains
    ... sometimes advantageous for incresing torque with an economy engine. ... If you reduce the clearance, doesn't it either do nothing (because you ... profiled to reduce acceleration forces in an aid for valvetrain ... A good valve overlap is required to enhance volumetric ...
    (rec.bicycles.tech)
  • Re: Valve setting
    ... Stock pushrods are aluminum, and they make the valve clearance shrink when the engine is warmed up. ... So if you have stock aluminum pushrods, adjust the valve gap to 0.15mm when the engine is COLD. ...
    (rec.autos.makers.vw.aircooled)
  • Re: Small valve clearances
    ... if the cold clearance is too small the hot clearance is ... but how do you explain this: Before I got the valve clearances ... a cold engine. ... I've never measured them on a hot engine. ...
    (uk.rec.cars.maintenance)
  • Re: Valve Adjust Question. .006 or zero???
    ... You can always set it cold and measure it hot - see the difference in your ... > skipped valve adjustments. ... > neglected engine like this had clearances all over the place, ... >>>Valve clearance GROWS as the engine warms up, ...
    (rec.autos.makers.vw.aircooled)
  • Re: Vauxhall Astra 1.7TD - Cant find small enough shims
    ... The inlet valve seats on this ... A shim is fitted in between, to adjust the gap to ... engine cold and valve closed. ... This is done by means of exchanging shims. ...
    (uk.rec.cars.maintenance)