[DeTomaso] Vibration in Longchamp
Richard Greenblum
Richard at richardgreenblum.com
Mon May 4 09:58:13 EDT 2015
Thomas,
If all else fails, try putting a large hose clamp on the drive shaft. It¹s
the same as adding weight. See what that does, then rotate it in 45 or 90
degree increments and see if anything changes. That can possibly help you
isolate the vibration to or from a particular shaft.
I know it¹s a pain in the butt unless you have a lift, in which case the
hardest part is test driving. That¹s why I¹d do this lastŠ
Richard
Austin, TX
From: Julian Kift <julian_kift at hotmail.com>
Date: Monday, May 4, 2015 at 8:49 AM
To: Thomas Tornblom <thomas at hax.se>, deTomaso List <detomaso at poca.com>,
"mikael_hass at mail.tele.dk" <mikael_hass at mail.tele.dk>
Subject: Re: [DeTomaso] Vibration in Longchamp
Something with the final drive, likely prop shaft would be my guess too
as it's speed related rather than engine/transmission. Either as
Thomas suggest 'phasing' of the u-joints or you mention a longer shaft
for the new transmission. Does the output flange of the
AOD transmission sit at the same height as the old C6? The distance
increase alone would have altered the propshaft and u-joint working
angle, is there any chance it is setting up some sort of harmonic
resonance? Does the vibration disappear at higher speeds?
Even if it is phased correctly, some driveshaft shops will recommend
simply clocking the propshaft 180 degrees as a first try.
Is it a fast cycle vibration or a slow cycle vibration? Place a bucket
of water on the passengers floor and go for drive. If the vibration
produces small ripples on the water this would be fast cycle it is
usually a drive train; driveshaft, motor or torque converter. If the
vibration puts waves on the top of the water or splashes, it's a slow
cycle vibration and usually an axle or tire. You can also try putting
the car on jack stands and running it up, but make sure it is very well
supported if you intend to run it up to 80 mph equivalent.
Julian
> Date: Mon, 4 May 2015 09:57:01 +0200
> From: thomas at hax.se
> To: detomaso at poca.com
> Subject: Re: [DeTomaso] Vibration in Longchamp
>
> If the shaft is a two piece thing with a U-joints and a slip joint,
> check that it is clocked correctly.
>
> Mikael skrev den 2015-05-04 09:34:
> > This winter I replaced the engine, trans (C6 to AOD), propshaft,
rear
> > diff, all rear ujoints and bearings. All was fine until I drove it
fast
> > as a test, at 80-90 mph it has a nasty vibration. No vibration
below
> > that speed, all seems fine. The vibration seems to change with
load,
> > but doesn't change if I use 3rd gear, so don't think it's engine
> > related.
> >
> >
> > Any ideas:
> >
> > 1. Wheels (the easy one of course, no vibration last year with same
> > wheels though, and usually wheel vibrations start at 50 mph IMO)
> >
> > 2. Prop shaft? (Brand new, built by people that don't do anything
> > else in UK)
> >
> > 3. Angles? Could it be trans/rear diff angles? What's the name of
> > the tool that measures, inclinometer?
> >
> > 4. Or?
> >
> > Right now just looking for ideas. I plan European vacation
including
> > German highways, so this has to be sorted out...
> >
> >
> > Mvh/Regards
> >
> > Mikael
> >
> >
> > !DSPAM:55472123739468702045!
> >
> >
> >
> > _______________________________________________
> >
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>
>
> --
> Real life: Thomas Toernblom Email: thomas at hax.se
> Snail mail: Banvallsvaegen 14 Phone: +46 18 32 31 18[1] Call: +46 18
32 31 18
> S - 754 40 Uppsala, Sweden Cellular: +46 76 209 8320[2] Call: +46 76
209 8320
>
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-------------- next part --------------
Thomas,
If all else fails, try putting a large hose clamp on the drive shaft.
It's the same as adding weight. See what that does, then rotate it in
45 or 90 degree increments and see if anything changes. That can
possibly help you isolate the vibration to or from a particular shaft.
I know it's a pain in the butt unless you have a lift, in which case
the hardest part is test driving. That's why I'd do this last...
Richard
Austin, TX
From: Julian Kift <[1]julian_kift at hotmail.com>
Date: Monday, May 4, 2015 at 8:49 AM
To: Thomas Tornblom <[2]thomas at hax.se>, deTomaso List
<[3]detomaso at poca.com>, "[4]mikael_hass at mail.tele.dk"
<[5]mikael_hass at mail.tele.dk>
Subject: Re: [DeTomaso] Vibration in Longchamp
Something with the final drive, likely prop shaft would be my guess
too
as it's speed related rather than engine/transmission. Either as
Thomas suggest 'phasing' of the u-joints or you mention a longer
shaft
for the new transmission. Does the output flange of the
AOD transmission sit at the same height as the old C6? The distance
increase alone would have altered the propshaft and u-joint working
angle, is there any chance it is setting up some sort of harmonic
resonance? Does the vibration disappear at higher speeds?
Even if it is phased correctly, some driveshaft shops will recommend
simply clocking the propshaft 180 degrees as a first try.
Is it a fast cycle vibration or a slow cycle vibration? Place a
bucket
of water on the passengers floor and go for drive. If the vibration
produces small ripples on the water this would be fast cycle it is
usually a drive train; driveshaft, motor or torque converter. If the
vibration puts waves on the top of the water or splashes, it's a
slow
cycle vibration and usually an axle or tire. You can also try
putting
the car on jack stands and running it up, but make sure it is very
well
supported if you intend to run it up to 80 mph equivalent.
Julian
> Date: Mon, 4 May 2015 09:57:01 +0200
> From: [6]thomas at hax.se
> To: [7]detomaso at poca.com
> Subject: Re: [DeTomaso] Vibration in Longchamp
>
> If the shaft is a two piece thing with a U-joints and a slip
joint,
> check that it is clocked correctly.
>
> Mikael skrev den 2015-05-04 09:34:
> > This winter I replaced the engine, trans (C6 to AOD), propshaft,
rear
> > diff, all rear ujoints and bearings. All was fine until I drove
it
fast
> > as a test, at 80-90 mph it has a nasty vibration. No vibration
below
> > that speed, all seems fine. The vibration seems to change with
load,
> > but doesn't change if I use 3rd gear, so don't think it's engine
> > related.
> >
> >
> > Any ideas:
> >
> > 1. Wheels (the easy one of course, no vibration last year with
same
> > wheels though, and usually wheel vibrations start at 50 mph IMO)
> >
> > 2. Prop shaft? (Brand new, built by people that don't do
anything
> > else in UK)
> >
> > 3. Angles? Could it be trans/rear diff angles? What's the name
of
> > the tool that measures, inclinometer?
> >
> > 4. Or?
> >
> > Right now just looking for ideas. I plan European vacation
including
> > German highways, so this has to be sorted out...
> >
> >
> > Mvh/Regards
> >
> > Mikael
> >
> >
> > !DSPAM:55472123739468702045!
> >
> >
> >
> > _______________________________________________
> >
> > Detomaso Forum Managed by POCA
> > Posted emails must not exceed 1.5 Megabytes
> > DeTomaso mailing list
> > [8]DeTomaso at poca.com
> > [9]http://poca.com/mailman/listinfo/detomaso_poca.com
> >
> > To manage your subscription (change email address, unsubscribe,
etc.) use the links above.
> >
> >
> > !DSPAM:55472123739468702045!
> >
>
>
> --
> Real life: Thomas Toernblom Email: [10]thomas at hax.se
> Snail mail: Banvallsvaegen 14 Phone: +46 18 32 31 18[1] Call: +46
18
32 31 18
> S - 754 40 Uppsala, Sweden Cellular: +46 76 209 8320[2] Call: +46
76
209 8320
>
> _______________________________________________
>
> Detomaso Forum Managed by POCA
> Posted emails must not exceed 1.5 Megabytes
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etc.)
use the links above.
References
1. [13]file://localhost/tmp/tmpd_3r92.html
2. [14]file://localhost/tmp/tmpd_3r92.html
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