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-   -   what causes shaking? (http://www.autobanter.com/showthread.php?t=62970)

[email protected] April 20th 06 09:27 PM

what causes shaking?
 
You might know that I drive a 82 Rabbit pickup gasser. It shakes when
I drive it. It is directly proportional to road speed. At low speed,
I can see the wheel turn slightly back and forth on its own. At high
speed the whole truck shakes. At illegal speeds, the truck shakes
violently. It has been a while since I have had the wheels balanced,
but they have been balanced a few times with these tires a few times.
I think that it changes greatly when I have the wheels rotated. I am
thinking the one of the two front wheels are messed up, whether it be a
bent rim, or 'f'ed up tire. I dont think that I have a bad bearing,
but one of the bearings is original at 185k miles. I have been
thinking of ditching my steel rims for cheap alloys. Anybody know
where I can get aluminum rims that would fit this?


Joseph Meehan April 20th 06 09:38 PM

what causes shaking?
 
wrote:
> You might know that I drive a 82 Rabbit pickup gasser. It shakes when
> I drive it. It is directly proportional to road speed. At low speed,
> I can see the wheel turn slightly back and forth on its own. At high
> speed the whole truck shakes. At illegal speeds, the truck shakes
> violently. It has been a while since I have had the wheels balanced,
> but they have been balanced a few times with these tires a few times.
> I think that it changes greatly when I have the wheels rotated.


Well you can start moving combinations around, two at a time, and find
out which one it is.

I am
> thinking the one of the two front wheels are messed up, whether it be
> a bent rim, or 'f'ed up tire. I dont think that I have a bad bearing,
> but one of the bearings is original at 185k miles. I have been
> thinking of ditching my steel rims for cheap alloys.


You are going the wrong way. Those alloy wheels are prone to damage and
getting bent and the cheap ones are the worse. Steel is less likely to
cause problems.

I suspect the problem is a tyre. Sometimes belts shift so if you look
at the tread as the wheel turns you will see it move left and right at one
spot on the wheel as it spins. The only fix is replacement. It is also
possible that there is a dynamic balance problem. Dynamic balancing cost
more (sometimes called computer balancing) they spin the wheel at high speed
on the machine.

Of course there are other possible issues, but your description seem to
fit a wheel or tyre.

Don't mix old and new tread on the same axle and put the best rubber on
the rear. It helps keep your car pointed in the direction you are moving in
an emergency.

> Anybody know
> where I can get aluminum rims that would fit this?


--
Joseph Meehan

Dia duit



Bryan K. Walton April 21st 06 01:41 AM

what causes shaking?
 
On 2006-04-20, > wrote:
> I can see the wheel turn slightly back and forth on its own. At high
> speed the whole truck shakes. At illegal speeds, the truck shakes
> violently. It has been a while since I have had the wheels balanced,


Have you checked the tie rods and the ball joints? With the car raised
up on jacks, put your hands at the 9 and 3 positions of the wheel and
try to rock it back and forth. (Make sure that your steering wheel is
locked.) If it rocks back and forth (and the movement appears to be
coming from the 9 o'clock position mostly) I would suspect your tie
rods. If it moves back and forth but the movement looks like it is
coming more from the 3 o'clock area of the wheel, check out your ball
joint(s). Ball joints should be fairly firm. Next, place your hands
at the 12 and 6 o'clock positions and try rocking the wheel. If it
moves in these areas, I would suspect your wheel bearings.

Good luck,
Bryan

--
remove the "REMOVE" from my email to email

Jellyfinger April 21st 06 09:58 AM

what causes shaking?
 
On Thu, 20 Apr 2006 20:38:52 GMT, "Joseph Meehan"
> wrote:
> Don't mix old and new tread on the same axle and put the best rubber on
>the rear. It helps keep your car pointed in the direction you are moving in
>an emergency.


Sorry to pounce on this, but the accepted wisdon is to have the good
rubber on the front as it carries 70-90% of the breaking and does all
of the steering. (and on a FWD, provides drive; the rears are there
to stop the arse dragging)

Joseph Meehan April 21st 06 11:05 AM

what causes shaking?
 
Jellyfinger wrote:
> On Thu, 20 Apr 2006 20:38:52 GMT, "Joseph Meehan"
> > wrote:
>> Don't mix old and new tread on the same axle and put the best
>>rubber on the rear. It helps keep your car pointed in the direction
>>you are moving in an emergency.

>
> Sorry to pounce on this, but the accepted wisdon is to have the good
> rubber on the front as it carries 70-90% of the breaking and does all
> of the steering. (and on a FWD, provides drive; the rears are there
> to stop the arse dragging)


Which is wrong. The safety experts agree that the best tyres need to be
on the back. (BTW that 70-90% figure for brakes is generally not correct as
well.). The problem is when a car goes into a skid, the most dangerous
thing is to have the back tyres loose grip as that will result in you
looking where you have been and not where you are going.

--
Joseph Meehan

Dia duit



Jellyfinger April 21st 06 01:36 PM

what causes shaking?
 
On Fri, 21 Apr 2006 10:05:10 GMT, "Joseph Meehan"
> wrote:

>Jellyfinger wrote:
>> On Thu, 20 Apr 2006 20:38:52 GMT, "Joseph Meehan"
>> > wrote:
>>> Don't mix old and new tread on the same axle and put the best
>>>rubber on the rear. It helps keep your car pointed in the direction
>>>you are moving in an emergency.

>>
>> Sorry to pounce on this, but the accepted wisdon is to have the good
>> rubber on the front as it carries 70-90% of the breaking and does all
>> of the steering. (and on a FWD, provides drive; the rears are there
>> to stop the arse dragging)

>
> Which is wrong. The safety experts agree that the best tyres need to be
>on the back. (BTW that 70-90% figure for brakes is generally not correct as
>well.). The problem is when a car goes into a skid, the most dangerous
>thing is to have the back tyres loose grip as that will result in you
>looking where you have been and not where you are going.



OK, I don't want to get into a flame war over this so I'll continue
what I'm doing, you do your own thing, but I want to ask this
question.. if the rears are doing so much, why do the fronts alwas
wear out first on a FWD?

Joseph Meehan April 21st 06 02:27 PM

what causes shaking?
 
Jellyfinger wrote:
> On Fri, 21 Apr 2006 10:05:10 GMT, "Joseph Meehan"
> > wrote:
>
>>Jellyfinger wrote:
>>> On Thu, 20 Apr 2006 20:38:52 GMT, "Joseph Meehan"
>>> > wrote:
>>>> Don't mix old and new tread on the same axle and put the best
>>>>rubber on the rear. It helps keep your car pointed in the direction
>>>>you are moving in an emergency.
>>>
>>> Sorry to pounce on this, but the accepted wisdon is to have the good
>>> rubber on the front as it carries 70-90% of the breaking and does
>>> all of the steering. (and on a FWD, provides drive; the rears are
>>> there to stop the arse dragging)

>>
>> Which is wrong. The safety experts agree that the best tyres
>>need to be on the back. (BTW that 70-90% figure for brakes is
>>generally not correct as well.). The problem is when a car goes into
>>a skid, the most dangerous thing is to have the back tyres loose grip
>>as that will result in you looking where you have been and not where
>>you are going.

>
>
> OK, I don't want to get into a flame war over this so I'll continue
> what I'm doing, you do your own thing, but I want to ask this
> question.. if the rears are doing so much, why do the fronts alwas
> wear out first on a FWD?


It is not a question of which tyres are doing more or will wear out
sooner. It is a question of what happens in an emergency situation.

Where it not for the handling problem, I would suggest the best tyres on
the front. After all you do want the best traction in mud or snow. You
also want the best tread up front to reduce hydroplaning. However those who
have done the numbers on the relative risks (between hydroplaning and
loosing control) have indicated that the best in the back is better.

I would be tempered to reverse that if hydroplaning was a more serious
threat where I drive.

Of course it all comes back to the idea that you should have four good
tyres and not try and skimp on your tyres. They are the only contact you
have with the road.

--
Joseph Meehan

Dia duit



Brian Running April 21st 06 05:21 PM

what causes shaking?
 
>> Sorry to pounce on this, but the accepted wisdon is to have the good
>> rubber on the front as it carries 70-90% of the breaking and does all
>> of the steering. (and on a FWD, provides drive; the rears are there
>> to stop the arse dragging)

>
> Which is wrong. The safety experts agree that the best tyres need to be
> on the back. (BTW that 70-90% figure for brakes is generally not correct as
> well.). The problem is when a car goes into a skid, the most dangerous
> thing is to have the back tyres loose grip as that will result in you
> looking where you have been and not where you are going.


You are wrong, and dangerously wrong.

Mike April 21st 06 05:52 PM

what causes shaking?
 
Have you thought about checking your rotors I don't know if you have
rotors or drums on front sometimes you can get what is called Heat
Checking or some call heat spots that can warp your rotors or drums you
may wanna check those out too and see if you have any spots if you do
you can always have them turned and then of course you will want to
replace the pads or shoes whichever applies. Just a thought???


Joseph Meehan April 22nd 06 02:02 AM

what causes shaking?
 
Brian Running wrote:
>>> Sorry to pounce on this, but the accepted wisdon is to have the good
>>> rubber on the front as it carries 70-90% of the breaking and does
>>> all of the steering. (and on a FWD, provides drive; the rears are
>>> there to stop the arse dragging)

>>
>> Which is wrong. The safety experts agree that the best tyres
>> need to be on the back. (BTW that 70-90% figure for brakes is
>> generally not correct as well.). The problem is when a car goes
>> into a skid, the most dangerous thing is to have the back tyres
>> loose grip as that will result in you looking where you have been
>> and not where you are going.

>
> You are wrong, and dangerously wrong.


http://www.pepboys.com/learning_cent..._buy_four.html

http://www.thestar.com/NASApp/cs/Con...=1026296450133



--
Joseph Meehan

Dia duit




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