Sorry for the interuption, but who else besides Saab made these "hydraulic
(actively damped) engine mounts"? I getting ready for transplanting a Ford
2.3 Turbo motor into my 84 Vanagon and need to address the ballance issue as
well.

Thanks,

Herb in PA

----- Original Message -----
From: "Frank Grunthaner" <FrankGRUN@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, February 24, 2003 12:48 AM
Subject: I4 engine/vibrations - A few quick comments

> In a message dated 2/23/03 4:12:07 PM, McNock@EASYSTREET.COM writes:
>
> << beat to death yes, but definitively figured out - no! (at least for
this
>
> van!)
>
>
> I have been to your website may times (fabulous and thanks) and searched
the
>
> achives many times. Below  I have a list of all that has been done.
>
>
> It is mostly everything every discussed.  That is why I am so frustated.
>
> Better, Absolutely. Fixed - well no. >>
>
> You'e definitely correct on your website observations, but fall a bit
short
> on the summary. I have indicated in the past and at some length a number
of
> technical issues that come to the solution including the mounting of the
> exhaust, the coupling of the exhaust and the details of the engine mount.
>
> Of all of these, resonance plays a powerful role. After eliminating the
basic
> engine issues (bent pulleys, H/A mounting brackets and exhaust coupling)
you
> will return to the engine mount and its active or passive isolation
> technology. All manufacturers of large displacement 4 cylinder in line
> engines must confront this problem. The problem is minor at 1.6L, more
> significant at 1.8L, a real discomfort at 2.0L and a major pain in the
tush
> at 2.3 and above. All manufacturers (VW. Porsche, Audi, Mercedes, SAAB,
Volvo
> to name a few Euro's) adopt one of two solutions: Addition of a balance
shaft
> to the engine or the use of hydraulic (actively damped) engine mounts. I
have
> adapted the SAAB hydraulic mount to the VW Vanagon diesel mounting system
> (refers to the '82 design only since this is what I play with). On my test
> stand, the Audi 3A 2.0L engine (inline 4) with turbo is vibration free.
But I
> have more work to do for better clearance. I have not yet been able to
mount
> the new engine in the Vanagon, so I haven't conducted any vibration
> measurements yet. I will!
>
> In the meantime feel free to experiment with the hydraulics. BTW your
> description of differences betwixt the 82 and later varients also misses a
> few key points.
>
> Frank Grunthaner