CorvAircraft> Resetting valve train adjustment after disassembly and reassembly

[Dave Morris "BigD"]

Rad, glad to see you lurking here.  Care to add your learned opinion about 
the crank failures?  And by the way, William recommends 3/4 turn.

Dave Morris

At 09:39 AM 2/17/2006, you wrote:
>The only thing I'll point out here is that Chevrolet's
>1 turn number was based on different lifters than are
>currently available for the corvair.
>
>If you get lifters from Clark's, Wall's, or your local
>auto parts store, you will not have 1 turn of
>adjustment available.  That's why 1/2 turn has pretty
>much become the standard for engines unlikely to be
>overrevved.  1/4 turn is the "performance" setting.
>It doesn't make the engine run any better, but makes
>it much less likely to pump a valve off its seat at
>the expense of cold valve clatter under some
>conditions.
>
>There's nothing wrong with 1/2 turn, and there's
>nothing wrong with 1/4 turn.  If WW says use 1/4 turn,
>go with it.  The trickier part is correctly
>determining zero lash.  It's a subtle thing because of
>the springs and air pockets in the lifters when the
>engine isn't running.
>
><insert standard ground-pounder disclaimer here>
>
>- Rad Davis
>
>--- John Brannen <j.brannen at yahoo.com> wrote:
>
> > 1/2 or 3/4 or 1 turn is just what the preload is.  I
> > tend to stay on the low end of the preload.  If you
> > have too much preload you run the risk of a lifter
> > pumping up and keeping a valve off it's seat.  Will
> > this happen at 1/2, 3/4 or 1 turn?  Probably not,
> > but
> > I prefer less preload as opposed to more.  The
> > plunger
> > in the lifter has a limited range of movement.
> > Going
> > lower on the preload gives more range the other way.
> >
> > If due to expansion the preload goes away, no big
> > deal
> > the valve will clatter a little.  Solid lifter
> > rockers
> > clatter all the time.
> >
> > Chevy who designed the corvair says 1 turn.  Who's
> > right?  decide for yourself.  Use 3/4 if you want.
> > The engine won't care.
> >
> > John B
> >
> > --- "Dave Morris \"BigD\"" <BigD at DaveMorris.com>
> > wrote:
> >
> > > WW recommends 3/4 turn.  I believe I've heard
> > > various other numbers coming
> > > from the Corvair auto community, but, as WW likes
> > to
> > > say, if they are
> > > wrong, they probably won't offer to come out and
> > > adjust your valves 6"
> > > behind a spinning prop. :)
> > >
> > > Dave Morris
> > >
> > > At 10:44 AM 2/12/2006, you wrote:
> > > >I'm not sure what method that WW uses or
> > > recommends,
> > > >snip
> > >
> > >
> > >
> > > >Once you have zero lash, give the adjusting nut
> > > about
> > > >1/2 turn additional.
> > >
> > >
> > >
> > >
> >
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