Valve noise might be increased by the 1.5 ratio rockers. They open
wider in the same time, so the valve action happens faster. I have a
cam in my X1/9 that has short seat-to-seat duration, but opens the
valves very fast. This gives performance while minimizing torque loss.
It makes a lot of noise though...
Ulix
Jeff Boatright wrote:
>
> I think that loud tapping after the gap is set correctly may be
> indicative of collapsed tappets or worn pushrods. I can't swear to
> this, but either the Haynes or Bentley (BL/BMC) workshop manuals
> state something to this effect in the sectoin on how to set the gap.
>
> However, given that you've just changed the set-up, could it be that
> the rollers themselves are louder?
>
> At 10:39 AM +0000 12/20/99, Brian Doody wrote:
> >Midget & Sprite Club - http://www.mgcars.org.uk/midgetspriteclub
> >
> >Folks,
> >
> >While on the subject of roller rockers
> >I have just fitted a 1.5 set to my '67 Sprite 1275
> >its also got a new Kent 266 cam + followers + new Mini Sports stage 2
> >unleaded head.
> >
> >I had a lot of trouble with the rockers hitting the rocker cover
> >but thats sorted now.
> >
> >HOwever AT the recommended TAPPET gap of .016" (.40mm) the valver clatter
> >is very loud - it doesnt sound right - is this normal??
> >Ive re-adjusted them over and over but to no avail
> >the car is only used on the road and not abused - do I really need so big a
> >gap?
> >or is something else wearing ???
> >
> >regards,
> >Brian
> >
> >
> >______________________________________________________________________
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> Jeffrey H. Boatright, PhD
> Assistant Professor, Emory Eye Center
> Senior Editor, Molecular Vision
> http://www.molvis.org/molvis
> Mailto:jboatri@emory.edu
--
Ulix __/__,__ ___/__|__
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http://students.washington.edu/~ulix/ '67 Sprite '74 X1/9
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