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Jim,
How are your motor and trans mounts? If they allow the engine/gearbox =
combo to shift out of line when under high torque, the u-joints could =
move out of proper alignment, but then when power is reduced, things =
would shift back into position. If you put the car on jackstands and =
run it to this rpm in top gear (might not be a bad idea to remove the =
drive wheels and tires if you=E2=80=99re sure they=E2=80=99re balanced) =
there won=E2=80=99t be much load on the engine, so if the vibration is =
due to deformation of the mounts, the vibration should not appear.
Duncan
> On Jun 15, 2015, at 10:55 AM, toodamnfunky@comcast.net wrote:
>=20
> FoT,
> I have a driveline vibration that doesn't start up until I get to =
about 95- 100 MPH. I figured I would start with the driveshaft
> before looking into the diff or OD/trans. I have an IRS car with =
Richard Good CV axles and hubs so it's very un likely its that but
> I will inspect them. I'm wondering if anybody has any advice on high =
speed vibration diagnosis or detection.
> What I'm wondering is even if it is the driveshaft how would I know =
with it sitting on my bench.
> Any help would, as always be greatly appreciated.
> Jim g
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/duncan.charlton54@gmail.com
>=20
>=20
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Jim,<div class=3D""><br class=3D""></div><div class=3D"">How =
are your motor and trans mounts? If they allow the engine/gearbox =
combo to shift out of line when under high torque, the u-joints could =
move out of proper alignment, but then when power is reduced, things =
would shift back into position. If you put the car on jackstands =
and run it to this rpm in top gear (might not be a bad idea to remove =
the drive wheels and tires if you=E2=80=99re sure they=E2=80=99re =
balanced) there won=E2=80=99t be much load on the engine, so if the =
vibration is due to deformation of the mounts, the vibration should not =
appear.</div><div class=3D""><div class=3D""><div class=3D""><br =
class=3D""><div class=3D""><div class=3D"">Duncan</div><div class=3D""><br=
class=3D""></div><div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Jun 15, 2015, at 10:55 AM, =
<a href=3D"mailto:toodamnfunky@comcast.net"; =
class=3D"">toodamnfunky@comcast.net</a> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D""><div =
style=3D"font-family: Arial; font-size: 12pt;" class=3D""><div =
class=3D"">FoT,<br aria-label=3D"Compose body" class=3D""></div>
<div class=3D"">I have a driveline vibration that doesn't start up until =
I get to about 95- 100 MPH. I figured I would start with the =
driveshaft</div>
<div class=3D"">before looking into the diff or OD/trans. I have an IRS =
car with Richard Good CV axles and hubs so it's very un likely its that =
but</div>
<div class=3D"">I will inspect them. I'm wondering if anybody has any =
advice on high speed vibration diagnosis or detection.</div>
<div class=3D"">What I'm wondering is even if it is the driveshaft how =
would I know with it sitting on my bench. </div>
<div class=3D"">Any help would, as always be greatly appreciated.</div>
<div class=3D"">Jim =
g</div></div></div>_______________________________________________<br =
class=3D""><a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a><br class=3D""><br =
class=3D"">http://www.fot-racing.com<br class=3D""><br class=3D"">Donate: =
http://www.team.net/forums<br class=3D"">Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/duncan.charlton54@gmail.com<br =
class=3D""><br class=3D""><br class=3D""></div></blockquote></div><br =
class=3D""></div></div></div></div></div></body></html>=
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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