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Hi Jim,
I don=E2=80=99t mean high loads as in high side loads generated by =
cornering, which, as you imply, could cock the motor and gearbox a bit =
to one side. What I mean is that in top gear, as you approach the =
point where the amount of drag equals the amount of power available, the =
driveline is absorbing maximum power and the mounts mounts are providing =
maximum resistance to the engine=E2=80=99s torque reaction. The =
motor/gearbox might cock a bit even in a straight line, I think.
Duncan
> On Jun 15, 2015, at 2:32 PM, toodamnfunky@comcast.net wrote:
>=20
> Thanks Duncan but I never get the vibration under high loads like =
coming off a corner, it's only at top speed.
> However the trans mount is worth looking in to. I'll have the =
driveshaft out to a shop by next Monday to check the balance and install =
new u-joints
> just in case. I hope the problem is that or the trans mount.=20
> =20
> jim
>=20
> From: "Duncan Charlton" <duncan.charlton54@gmail.com>
> To: toodamnfunky@comcast.net
> Cc: "fot" <fot@autox.team.net>
> Sent: Monday, June 15, 2015 1:13:33 PM
> Subject: Re: [Fot] TR4 High speed driveline vibration
>=20
> Jim,
>=20
> 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.
>=20
> Duncan
>=20
>=20
> On Jun 15, 2015, at 10:55 AM, toodamnfunky@comcast.net =
>=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
> _______________________________________________
>=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
>=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"">Hi Jim,<div class=3D""><br class=3D""><div class=3D"">I =
don=E2=80=99t mean high loads as in high side loads generated by =
cornering, which, as you imply, could cock the motor and gearbox a bit =
to one side. What I mean is that in top gear, as you approach the =
point where the amount of drag equals the amount of power available, the =
driveline is absorbing maximum power and the mounts mounts are providing =
maximum resistance to the engine=E2=80=99s torque reaction. The =
motor/gearbox might cock a bit even in a straight line, I =
think.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Duncan</div><div class=3D""><br =
class=3D""></div><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jun 15, 2015, at 2:32 PM, <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"">Thanks Duncan but I never get the vibration under high loads =
like coming off a corner, it's only at top speed.<br class=3D""></div>
<div class=3D"">However the trans mount is worth looking in to. I'll =
have the driveshaft out to a shop by next Monday to check the balance =
and install new u-joints</div>
<div class=3D"">just in case. I hope the problem is that or the trans =
mount. </div>
<div class=3D""> </div>
<div class=3D"">jim</div>
<div class=3D""><br class=3D""></div>
<hr id=3D"zwchr" class=3D"">
<div style=3D"font-size: 12pt; text-decoration: none; font-family: =
Helvetica, Arial, sans-serif; font-weight: normal; font-style: normal;" =
class=3D""><b class=3D"">From: </b>"Duncan Charlton" <<a =
href=3D"mailto:duncan.charlton54@gmail.com"; =
class=3D"">duncan.charlton54@gmail.com</a>><br class=3D""><b =
class=3D"">To: </b><a href=3D"mailto:toodamnfunky@comcast.net"; =
class=3D"">toodamnfunky@comcast.net</a><br class=3D""><b class=3D"">Cc: =
</b>"fot" <fot@autox.team.net><br class=3D""><b class=3D"">Sent: =
</b>Monday, June 15, 2015 1:13:33 PM<br class=3D""><b class=3D"">Subject: =
</b>Re: [Fot] TR4 High speed driveline vibration<br class=3D"">
<div class=3D""><br class=3D""></div>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 class=3D"">
<blockquote class=3D"">
<div class=3D"">On Jun 15, 2015, at 10:55 AM, <a =
href=3D"mailto:toodamnfunky@comcast.net"; target=3D"_blank" =
class=3D"">toodamnfunky@comcast.net</a> wrote:</div><br =
class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"">
<div style=3D"FONT-SIZE: 12pt; FONT-FAMILY: Arial" class=3D"">
<div class=3D"">FoT,<br 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"; target=3D"_blank" =
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></div>
<div class=3D""><br =
class=3D""></div></div></div></div></blockquote></div><br =
class=3D""></div></body></html>=
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