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Re: Prop/driveshaft vibration

To: mhooper@pix-cinema.com
Subject: Re: Prop/driveshaft vibration
From: "Paula J. Graffam" <pjgraffam@juno.com>
Date: Mon, 24 Mar 2003 20:28:15 -0500
Hi Mark,

Correction . . . I oriented the diff. 180 degrees to the shaft NOT the
shaft to the differential.  Sorry.

Al

On Mon, 24 Mar 2003 18:15:42 -0500 Mark Hooper <mhooper@pix-cinema.com>
writes:
> Well Al, you've got me. There must be some simple explanation, but I 
> don't
> know what it is. By the way, when you said you rotated your crank 
> shaft 180
> degreees does that mean relative to the transmission, the 
> differential or
> one end of the shaft to the other?
> 
> I have a hard vibration too and am trying to eliminate it.
> 
> Mark
> 
> 
> -----Original Message-----
> From: Paula J. Graffam [mailto:pjgraffam@juno.com]
> Sent: Monday, March 24, 2003 6:12 PM
> To: mhooper@pix-cinema.com
> Cc: 6pack@autox.team.net
> Subject: Re: Prop/driveshaft vibration
> 
> 
> Hi Mark,
> 
> I really don't have anything different with my speedo.  The cable
> conversion is straight forward . . . it's simply connected to the 
> right
> side of the tranny and is braced accordingly and tracks like the
> original.  I don't see how the vibration could affect my speedo.
> 
> Al  
> 
> On Mon, 24 Mar 2003 17:57:48 -0500 Mark Hooper 
> <mhooper@pix-cinema.com>
> writes:
> > Al:
> > The only possible cause would be that the link between the speedo 
> > cable and
> > the transmission was being affected by the vibration. That would 
> > indicate
> > some sort of magnetic follower gear in the transmission which 
> seems
> > amazingly unlikely for a mechanical speedo. What sort of 
> speedometer 
> > setup
> > do you have in the conversion?
> > 
> > Mark Hooper
> > 1972 TR6
> > 
> > 
> > -----Original Message-----
> > From: Paula J. Graffam [mailto:pjgraffam@juno.com]
> > Sent: Monday, March 24, 2003 5:28 PM
> > To: 6pack@autox.team.net
> > Subject: Prop/driveshaft vibration
> > 
> > 
> > Hi Listers,
> > 
> > After converting my tranny(van den Akker) I noticed a definate 
> > vibration
> > at 60mph@ 3000+ rpm.  Some call it harmonic vibration.  After 
> > talking to
> > Herman, he advised me to rotate the driveshaft 180degrees ( maybe 
> I
> > incorrectly installed the shaft).
> > 
> > Well it worked . . . much to my relief!!!  I guess it's a common
> > troubleshooting technique.  However, I also noticed that my rpms
> > DECREASED especially in 4th and 5th gears.  I'm not sure why this 
> > is. 
> > Mind you now, I'm NOT complaining.
> > I'm now doing about 26k at 60mph and just about 29k at 70mph.   
> > 
> > Does anyone know why I'm doing better on the rpms AFTER the 
> > correction?  
> > 
> > Regards,
> > 
> > Al Graffam
> > 
> > ________________________________________________________________
> > 
> 
> 
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