Date: Wed, 24 Apr 2002 11:12:54 -0700
Reply-To: phil stanhope <napszeerf@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: phil stanhope <napszeerf@YAHOO.COM>
Subject: Re: Tiico: Harmonic balancing pulley
In-Reply-To: <B8EC3B99.23C0%albell@uvic.ca>
Content-Type: text/plain; charset=us-ascii
"I think it was Gary Stearns that posted a few
messages outlining his
experiences with vibrations and some solutions."
Yeah he did, here is a something he posted a few
months ago,(i keep a private file of good tips) check
the snip:
"Our TiiCo installation was one of those that was
burdened a major
droning resonance in the interior at about 3800 rpm.
I drove myself crazy
trying to eliminate this. Nearly all of my efforts
were targeted toward
the exhaust system. Now I realize that the exhaust
vibration was an
effect, not a cause. Last week, the droning suddenly
stopped on it's
own. Totally gone. Smooth constant sound all the way
up the tach. A day
later I discovered that the bracket that maintains
belt tension on the
alternator had fractured. Though broken, nothing fell
away and it
still kept the belt tension by keeping pressure on the
broken spot. I
noticed the break, removed it, and welded it up. The
droning vibes came
back big time. I remembered reading that many
automakers have ended up
revising alternator, A/C and other accessory mounts to
eliminate noise,
vibration and harshness (NVH) in 4 cylinder engines.
Oh my god, I found
it.
The solution came in the form of one of the rubber
bushing mounts
intended to mount the exhaust brackets in the TiiCo
installation. After
alot of experimentation I decided that the one on the
muffler side was
making the droning worse, so I left it out. Now, I
used it to separate
left and right sides of a fabricated alternator
tensioning bracket. It's
been installed for about a week, the droning has not
returned, and it
seems to do a good job of maintaining belt tension.
The fact that not all TiiCo engines seem to have this
problem surely
relates to the variety of belts and brackets that
mount the accessories.
Some have A/C, some don't. Some use one long
serpentine belt for most
of the pullies, some don't.
If you have the TiiCo droning, test this theory by
removing the
tensioning bracket and the belt from the alternator
(yes the charging light
will come on) and take a test drive. I'm betting it
will be the quietest
ride in your TiiCo powered Vanagon that you've ever
had.
Gary
--------END
Hope this helps
Phil
--- Alistair Bell <albell@UVIC.CA> wrote:
> Matthew,
>
> I think it was Gary Stearns that posted a few
> messages outlining his
> experiences with vibrations and some solutions.
> Engine mounts, resonant
> chambers, added weights, alternator mounts were some
> of the areas covered.
>
> The size and kind of muffler, and the method of
> exhaust
> attachment/joints/flex joints also have an effect on
> the 3k-3.5k buzz.
>
> David Marshall posited that the exhaust system was
> the main culprit. His
> test was the application of a human foot to the tail
> pipe or muffler and
> pushing down (reasonably) as an assistant revs the
> engine. He claimed that
> if this dampened the resonances, then the suspension
> of the muffler et al
> was to blame.
>
> My opinion is that the exhaust system certainly
> plays a big part, but also
> the engine and transmission mounts are the problem.
> Frank Grunthaler and
> myself were discussing this last spring/summer. He
> is way ahead with
> developing a better engine mount.
>
> Alistair
>
>
> --
> '82 Westy -> diesel converted to gas in '94
> albell@uvic.ca
> http://homepage.mac.com/alistairbell/home/
>
>
>
>
>
> on 24/04/2002 10:03 AM, Matthew Pollard at
> poll7356@UIDAHO.EDU wrote:
>
> > Does that sort of mean it helps but there are some
> bigger vibrations that
> > first need to be addressed? So the use of steel
> pipe filled with sand
> > bolted to the header is a better solution?
> >
> > do the vanagons that have native inline 4's (as
> opposed to a conversion.
> > Not diesel) have this problem? What is different-
> engine mounts, exhaust??
> > what about fastforward.ca conversions?
> > -matthew
> >
> > On Wed, 24 Apr 2002 vgonman@earthlink.net wrote:
> >
> >> BTDT, didn't make too much of a difference.
> >>
> >> Sean B.
> >>
> >>> Has any tiico freak out there put a harmonic
> balancing pulley on their
> >>> tiicos (say, a pulley off of a
> jetta/golf/wabbit/rocco/fox.etc). Would
> >>> it help to chill out those burley vibes we get
> at 3.4K rpm?
> >>>
> >>> Thanks
> >>> matthew
> >>> 86 syncro westy tiico w/ vibes
> >
__________________________________________________
Do You Yahoo!?
Yahoo! Games - play chess, backgammon, pool and more
http://games.yahoo.com/
| 
