[DeTomaso] Vibration in Longchamp, part 2

thomas thomas at hax.se
Tue May 5 17:04:47 EDT 2015


Ok, then that should not be the issue then.

> 5 maj 2015 kl. 22:45 skrev Mikael <mikael_hass at mail.tele.dk>:
> 
> See your point and just checked. The middle part is solid and the "ears" for the ujoints are phased correctly
> 
> 
> Sent from my BlackBerry Classic...
>   Original Message  
> From: thomas
> Sent: tirsdag den 5. maj 2015 21.56
> To: Mikael
> Cc: <detomaso at poca.com>
> Subject: Re: [DeTomaso] Vibration in Longchamp, part 2
> 
> I'm interested in the design and the phasing of the U-joints.
> 
> My cousin had violent vibrations in his Pantera after replacing the joints in one of his half shafts and he had phased the slip joint incorrectly and after fixing that the vibrations were gone.
> 
> The best solution is of course to get rid of U-joints and use CV-joints. 😊
> 
> I replaced my half shafts with CV shafts a few years back, and I couldn't be happier. I only regret all the work and money I wasted on the old stock shafts.
> 
> Thomas
> 
>> 5 maj 2015 kl. 21:36 skrev Mikael <mikael_hass at mail.tele.dk>:
>> 
>> No but I can maybe one, though shrouded by the lift and chassis cross members. What are you looking for?
>> 
>> 
>> Sent from my BlackBerry Classic...
>> Original Message 
>> From: thomas
>> Sent: tirsdag den 5. maj 2015 21.30
>> To: Mikael
>> Cc: <detomaso at poca.com>
>> Subject: Re: [DeTomaso] Vibration in Longchamp, part 2
>> 
>> Do you have a photo of the shaft, preferably installed on the car?
>> 
>>> 5 maj 2015 kl. 20:55 skrev Mikael <mikael_hass at mail.tele.dk>:
>>> 
>>> So wheels are sent to get balanced (won't leave my entire car at any
>>> shop). And the newly bought inclinometer arrived. Seemed like an
>>> accurate one, $150, and very consistent. At the diff I measured at the
>>> flange, 0.00 degrees. At the trans there's always a bit of looseness.
>>> Measured with propshaft just hanging (on yoke), 0.00 degrees (is it
>>> "on"? J) and then with the yoke pushed up by hand, 0.40 degrees. So
>>> trans must be 0.20 degrees up. Does anybody here do this for a living,
>>> can 0.20 degrees produce a vibration?
>>> 
>>> 
>>> So let's do some math here, and let me know if I got it wrong. There's
>>> about 115 cm from rear of trans to pivot points (engine mounts). So a
>>> full circle of the rear of the trans would be "pi" x 115 x 2 = 722 cm.
>>> With 360 degrees round, that would be 2 cm per degree. And I would have
>>> to lower the rear of the trans 0.20 x 2 cm= 4 mm. That I've done. Can
>>> that really make a difference? Looking at the old trans and mount
>>> versus new, it looks like the new trans is between 4 and 8 mm higher,
>>> so maybe that's it?
>>> 
>>> 
>>> Also took the chance to turn the propshaft on the rear diff 180
>>> degrees.
>>> 
>>> 
>>> Will not be able to test for a few days, not too optimistic.
>>> 
>>> 
>>> Mvh/Regards
>>> 
>>> Mikael
>>> 
>>> Hass Consult ApS
>>> 
>>> +45 31770747
>>> 
>>> mikael_hass at mail.tele.dk
>>> 
>>> 
>>> 
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>> 
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> 
> 
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