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OK,=20
I got it. The engine mounts are good but I may have a little movement in th=
e trans mount.=20
I'm glad you brought it up and I'll check it.=20
jim=20
----- Original Message -----
From: "Duncan Charlton" <duncan.charlton54@gmail.com>=20
To: toodamnfunky@comcast.net=20
Cc: "fot" <fot@autox.team.net>=20
Sent: Monday, June 15, 2015 4:13:44 PM=20
Subject: Re: [Fot] TR4 High speed driveline vibration=20
Hi Jim,=20
I don=E2=80=99t mean high loads as in high side loads generated by cornerin=
g, which, as you imply, could cock the motor and gearbox a bit to one side.=
=C2=A0 What I mean is that in top gear, as you approach the point where th=
e amount of drag equals the amount of power available, the driveline is abs=
orbing maximum power and the mounts mounts are providing maximum resistance=
to the engine=E2=80=99s torque reaction. =C2=A0The motor/gearbox might coc=
k a bit even in a straight line, I think.=20
Duncan=20
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 of=
f a corner, it's only at top speed.=20
However the trans mount is worth looking in to. I'll have the driveshaft ou=
t to a shop by next Monday to check the balance and install new u-joints=20
just in case. I hope the problem is that or the trans mount.=C2=A0=20
=C2=A0=20
jim=20
----- Original Message -----
From: "Duncan Charlton" < duncan.charlton54@gmail.com >=20
To: toodamnfunky@comcast.net=20
Cc: "fot" <fot@autox.team.net>=20
Sent: Monday, June 15, 2015 1:13:33 PM=20
Subject: Re: [Fot] TR4 High speed driveline vibration=20
Jim,=20
How are your motor and trans mounts? =C2=A0If 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 shif=
t back into position. =C2=A0If 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 an=
d tires if you=E2=80=99re sure they=E2=80=99re balanced) there won=E2=80=99=
t 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
<blockquote>
On Jun 15, 2015, at 10:55 AM, toodamnfunky@comcast.net wrote:=20
FoT,=20
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=20
before looking into the diff or OD/trans. I have an IRS car with Richard Go=
od CV axles and hubs so it's very un likely its that but=20
I will inspect them. I'm wondering if anybody has any advice on high speed =
vibration diagnosis or detection.=20
What I'm wondering is even if it is the driveshaft how would I know with it=
sitting on my bench.=20
Any help would, as always be greatly appreciated.=20
Jim g=20
_______________________________________________=20
fot@autox.team.net=20
http://www.fot-racing.com=20
Archive: http://www.team.net/archive=20
on54@gmail.com=20
</blockquote>
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><DIV>OK,<BR></DIV>
<DIV>I got it. The engine mounts are good but I may have a little movement =
in the trans mount.</DIV>
<DIV>I'm glad you brought it up and I'll check it.</DIV>
<DIV>jim</DIV>
<DIV><BR></DIV>
<HR id=3Dzwchr>
<DIV style=3D"FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetic=
a,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><=
B>From: </B>"Duncan Charlton" <duncan.charlton54@gmail.com><BR><B>To:=
</B>toodamnfunky@comcast.net<BR><B>Cc: </B>"fot" <fot@autox.team.net>=
;<BR><B>Sent: </B>Monday, June 15, 2015 4:13:44 PM<BR><B>Subject: </B>Re: [=
Fot] TR4 High speed driveline vibration<BR>
<DIV><BR></DIV>Hi Jim,
<DIV><BR>
<DIV>I don=E2=80=99t mean high loads as in high side loads generated by cor=
nering, 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 whe=
re the amount of drag equals the amount of power available, the driveline i=
s absorbing maximum power and the mounts mounts are providing maximum resis=
tance to the engine=E2=80=99s torque reaction. The motor/gearbox migh=
t cock a bit even in a straight line, I think.</DIV>
<DIV><BR></DIV>
<DIV>Duncan</DIV>
<DIV><BR></DIV>
<DIV>
<BLOCKQUOTE>
<DIV>On Jun 15, 2015, at 2:32 PM, <A href=3D"mailto:toodamnfunky@comcast.ne=
t" target=3D_blank>toodamnfunky@comcast.net</A> wrote:</DIV><BR class=3DApp=
le-interchange-newline>
<DIV>
<DIV>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: Arial">
<DIV>Thanks Duncan but I never get the vibration under high loads like comi=
ng off a corner, it's only at top speed.<BR></DIV>
<DIV>However the trans mount is worth looking in to. I'll have the drivesha=
ft out to a shop by next Monday to check the balance and install new u-join=
ts</DIV>
<DIV>just in case. I hope the problem is that or the trans mount. </DI=
V>
<DIV> </DIV>
<DIV>jim</DIV>
<DIV><BR></DIV>
<HR id=3Dzwchr>
<DIV style=3D"FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetic=
a, Arial, sans-serif; FONT-WEIGHT: normal; FONT-STYLE: normal"><B>From: </B=
>"Duncan Charlton" <<A href=3D"mailto:duncan.charlton54@gmail.com"; targe=
t=3D_blank>duncan.charlton54@gmail.com</A>><BR><B>To: </B><A href=3D"mai=
lto:toodamnfunky@comcast.net" target=3D_blank>toodamnfunky@comcast.net</A><=
BR><B>Cc: </B>"fot" <fot@autox.team.net><BR><B>Sent: </B>Monday, June=
15, 2015 1:13:33 PM<BR><B>Subject: </B>Re: [Fot] TR4 High speed driveline =
vibration<BR>
<DIV><BR></DIV>Jim,=20
<DIV><BR></DIV>
<DIV>How are your motor and trans mounts? If they allow the engine/ge=
arbox 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 i=
t to this rpm in top gear (might not be a bad idea to remove the drive whee=
ls 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 deformati=
on of the mounts, the vibration should not appear.</DIV>
<DIV>
<DIV>
<DIV><BR>
<DIV>
<DIV>Duncan</DIV>
<DIV><BR></DIV>
<DIV><BR>
<DIV>
<BLOCKQUOTE>
<DIV>On Jun 15, 2015, at 10:55 AM, <A href=3D"mailto:toodamnfunky@comcast.n=
et" target=3D_blank>toodamnfunky@comcast.net</A> wrote:</DIV><BR class=3DAp=
ple-interchange-newline>
<DIV>
<DIV>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: Arial">
<DIV>FoT,<BR></DIV>
<DIV>I have a driveline vibration that doesn't start up until I get to abou=
t 95- 100 MPH. I figured I would start with the driveshaft</DIV>
<DIV>before looking into the diff or OD/trans. I have an IRS car with Richa=
rd Good CV axles and hubs so it's very un likely its that but</DIV>
<DIV>I will inspect them. I'm wondering if anybody has any advice on high s=
peed vibration diagnosis or detection.</DIV>
<DIV>What I'm wondering is even if it is the driveshaft how would I know wi=
th it sitting on my bench. </DIV>
<DIV>Any help would, as always be greatly appreciated.</DIV>
<DIV>Jim g</DIV></DIV></DIV>_______________________________________________=
<BR><A href=3D"mailto:fot@autox.team.net"; target=3D_blank>fot@autox.team.ne=
t</A><BR><BR>http://www.fot-racing.com<BR><BR>Donate: http://www.team.net/d=
onate.html<BR>Archive: http://www.team.net/archive<BR>Forums: http://www.te=
am.net/forums<BR>Unsubscribe/Manage: http://autox.team.net/mailman/options/=
fot/duncan.charlton54@gmail.com<BR><BR><BR></DIV></BLOCKQUOTE></DIV><BR></D=
IV></DIV></DIV></DIV></DIV></DIV>
<DIV><BR></DIV></DIV></DIV></DIV></BLOCKQUOTE></DIV><BR></DIV></DIV>
<DIV><BR></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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