Date: Mon, 31 Jan 2000 17:01:59 -0500
Reply-To: Bob Donalds <bostneng@FCL-US.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Bob Donalds <bostneng@FCL-US.NET>
Organization: Boston Engine Exchange
Subject: Re: 6 mils of lash...
Content-Type: text/plain; charset=us-ascii
John wrote:
>
> Bob Donalds wrote:
> >
> > John wrote:
> > >
> > > Hi David,
> > >
> > > I've seen all the industry general guide lines about storing
> > > un-installed lifters in certain positions and pre-filling lifters by
> > > pumping them in warm oil baths but I can't buy any of it.
> > >
> >
> >
> > John and the list
> > If you think for a moment that the VOA factory follows bentley to the
> > letter
> > then I have a bridge for sale I would like to talk to you about
>
> Hi Bob,
>
> I've been away so I'm just responding to your reply. You should know
> that I'm a supporter of Boston Engine and I hate VWoA. If you could
> strap those creeps into Ol' Sparky, I'd love to throw the switch.
> However there is nothing new in 40 years in the function of hydraulic
> lifters and VW is a competent engine designer. As I wrote previously, I
> torched my exchange motor and and it went from trashing machine volume
> to a quiet, smooth running motor while I drained a 6 pack. That's the
> nature of hydraulic lifters.
>
> When the lifter contains COMPRESSIBLE air there is lash and a "door"
> opens and pressurized engine oil despells and takes the place of the
> air. When the lifter is full of NON-COMPRESSIBLE oil there is zero lash
> and the "door" doesn't open and the self-adjustment ceases at the
> engineered nominal clearance. Aside from the basic set up installation
> adjustment, subsequent mechanical adjustments make no sense.
>
> Trying to adust a hydraulic lifter is a little like trying to adjust the
> Digifant idle speed. Mechanically you can cause a change but the system
> design will simply counter your effect. Vanagon owners who are "green"
> to the the hydraulic lifter valve train should stay away from trying to
> adjust an automatic system. If hydraulic lifters need adjustment they
> were never set up correctly in the beginning.
>
> Bacj to you Bob, JP
John
thats sounds good but the fact is that I have adjusted and prelubed
lifters for
years and my experiance and the experiance of some members of the list
does not
support your theory
the hydraulic lifters in the van engines does sometimes not bleed the
air out on its own if its preloaded before its run I have had to back
the lifters off of to many vans to get the engine to idle and bring the
compression up
would anybody else like to speak about there lifters not doing what the
theory says
they should
John I hope you dont mind I forwarded this to the list
Bob Donalds
| 
