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Date:         Sun, 23 Feb 2003 21:41:39 -0800
Reply-To:     Julianna Thoennes <mumbrue@ATTBI.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Julianna Thoennes <mumbrue@ATTBI.COM>
Subject:      Re: vanagon with ticco engine/vibrations
Comments: To: Alistair Bell <albell@UVIC.CA>
Content-Type: text/plain; charset="iso-8859-1"

YES! I had not read your post when I sent mine off to the list. I tell you I am soo excited to have found the problem. when my brother started up the engine without the belts, and no buzzing, or vibration was occuring, I was practically, no I was, jumping up and down! That is, after I exited the van! : )

Julianna

----- Original Message ----- From: "Alistair Bell" <albell@UVIC.CA> To: <vanagon@GERRY.VANAGON.COM> Sent: Sunday, February 23, 2003 5:39 PM Subject: Re: vanagon with ticco engine/vibrations

> if I may, here is Gary Stearn's posting of a year or so ago. > > Alistair > > 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 >


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