I have a set of 1.5 roller rockers and they are not any louder then the
stock ones. These were designed and made by Pierce manifolds for use with
their heads and they are pretty quiet.
Larry Miller
----- Original Message -----
From: Ulix Goettsch <ulix@u.washington.edu>
To: Jeff Boatright <jboatri@emory.edu>
Cc: Brian Doody <Brian.Doody@digital.com>; <spridgets@autox.team.net>
Sent: Monday, December 20, 1999 3:33 PM
Subject: Re: Roller Rockers and Tappet Noise
> 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
> > >
> > >
> > >______________________________________________________________________
> > >To unsubscribe, write to midgetspriteclub-unsubscribe@listbot.com
> > >______________________________________________________________________
> > >PARTS DIRECT from sears.com
> > >Order the Right Part, Right Here, Right Now. Search our
> > >comprehensive database by model for parts, owner's manuals,
> > >diagrams, schematics, and more online. Shop
> > >http://www.listbot.com/links/sears5 for over 400 manufacturers:
> > >Whirlpool, GE, Maytag, Frigidaire, Sony, Kenmore, and Craftsman!
> >
> > Jeffrey H. Boatright, PhD
> > Assistant Professor, Emory Eye Center
> > Senior Editor, Molecular Vision
> > http://www.molvis.org/molvis
> > Mailto:jboatri@emory.edu
>
> --
> Ulix __/__,__ ___/__|__
> ..............................................(_o____o_)....<_O_____O_/...
> http://students.washington.edu/~ulix/ '67 Sprite '74 X1/9
>
|