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front end vibration
#31
(11-21-2019, 08:55 AM)Carolina_Mountain_Mustangs Wrote: Over the years I have owned 7 mustang convertibles and never had any kind of vibration issues. Yes there were issues in some of the newer Mustangs and they actually put a device in the trunk to kill the harmonic vibration you were told about. 
I worked in the lawn equipment industry for several years. The garden tillers we sold to Craftsman had a horrible harmonic vibration in the handle bars. The solution was what people thought was a brush guard on the front of the high end model. There was a cross bar that had the Craftsman name on it. The position of that bar up and down and the thickness of the bar is what killed the harmonic vibration and solved the issue. 
If the issue is a harmonic vibration has to be coming from engine, transmission, drive shaft or some rotating component. The body cannot make the vibration. 
I wish I were near you to take a ride in the car. Might be something that is normal and just new to you. Can you shoot a video to show the vibration?
Hi,

Thanks for your info.   I don't think a video would capture the vibration but I will drive later today and see if I can do that.  THanks
Steve
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#32
(11-21-2019, 08:58 AM)naa10104 Wrote:
(11-21-2019, 08:55 AM)Carolina_Mountain_Mustangs Wrote: Over the years I have owned 7 mustang convertibles and never had any kind of vibration issues. Yes there were issues in some of the newer Mustangs and they actually put a device in the trunk to kill the harmonic vibration you were told about. 
I worked in the lawn equipment industry for several years. The garden tillers we sold to Craftsman had a horrible harmonic vibration in the handle bars. The solution was what people thought was a brush guard on the front of the high end model. There was a cross bar that had the Craftsman name on it. The position of that bar up and down and the thickness of the bar is what killed the harmonic vibration and solved the issue. 
If the issue is a harmonic vibration has to be coming from engine, transmission, drive shaft or some rotating component. The body cannot make the vibration. 
I wish I were near you to take a ride in the car. Might be something that is normal and just new to you. Can you shoot a video to show the vibration?
Hi,

Thanks for your info.   I don't think a video would capture the vibration but I will drive later today and see if I can do that.  THanks
Steve
If you have a go pro or a small video camera you can mount under the car you might see something. The front suspension on a Mustang is scary to watch on a video under the car shows how weak it really is.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#33
(11-21-2019, 09:38 AM)Carolina_Mountain_Mustangs Wrote:
(11-21-2019, 08:58 AM)naa10104 Wrote:
(11-21-2019, 08:55 AM)Carolina_Mountain_Mustangs Wrote: Over the years I have owned 7 mustang convertibles and never had any kind of vibration issues. Yes there were issues in some of the newer Mustangs and they actually put a device in the trunk to kill the harmonic vibration you were told about. 
I worked in the lawn equipment industry for several years. The garden tillers we sold to Craftsman had a horrible harmonic vibration in the handle bars. The solution was what people thought was a brush guard on the front of the high end model. There was a cross bar that had the Craftsman name on it. The position of that bar up and down and the thickness of the bar is what killed the harmonic vibration and solved the issue. 
If the issue is a harmonic vibration has to be coming from engine, transmission, drive shaft or some rotating component. The body cannot make the vibration. 
I wish I were near you to take a ride in the car. Might be something that is normal and just new to you. Can you shoot a video to show the vibration?
Hi,

Thanks for your info.   I don't think a video would capture the vibration but I will drive later today and see if I can do that.  THanks
Steve
If you have a go pro or a small video camera you can mount under the car you might see something. The front suspension on a Mustang is scary to watch on a video under the car shows how weak it really is.
Hello, Drove it today with the top up made no difference at all.  The cyclic vibration is definitely in the steering wheel only, not felt anywhere else.  Not in the body, seat or pedals.  It comes on then fades away as slow as 20 mph and is at its worse at 40 -50.  It feels like something in the front tires/wheels/suspension.  No clue at this point.  I will be taking it to a shop in a couple of weeks, I'll post any new information here.  Thanks for your help !
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#34
A cyclic vibration usually is caused by at least two rotating components being out of balance or out of round. They are rotating at different speeds and can cancel each other out and then both vibrate as they go in and out of phase. Makes it even more difficult to diagnose the cause.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#35
I am sure you have swapped out the front tires to see if it is them? Did you check the center hole diameter to see if they fit the hubs to center the wheels?
In racing you get what is called caster vibration but I doubt you could put enough caster into the front end to cause on this model. The same thing happens with a shopping cart when the front wheel goes crazy shaking back and forth. 
I did go to the internet and found a pretty informative video that goes through most areas you should be looking at. The cure for this car was to add braces that kill or change the frequency of the vibration through the body. It is on a Buick but like I said previously we had same issue with a garden tiller and did similar to change the frequency of the machine and stop the vibrations. 
https://youtu.be/ROYkQxeLyTk
They do show checking hub, tire, wheel run out and also balancing the drums and rotors if you have disc. 
We had a frequency generator at the lawn mower plant. We could put components on the machine and accelerate the failure of the part to see where it would fail. One component on a mower that is considered very critical is of course the blade. Each batch of blades got tested. You could make a mower blade break in half in 3 min. on the tester if there were any tool marks that concentrated the stress. Parts were rejected and tool mark fixed to eliminate the issue. 
This video will give you areas to ask your shop to check closely. 


:///


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#36
I've not gone back to check your earlier thread on this or stuck my nose into this one, but I don't remember if you mentioned what wheel rims you have on your car. I'm assuming factory with hub caps, BUT if by chance you have Magnum 500's, likely aftermarket, then these wheels MUST be balanced on a centering adaptor. One cannot use the wheel center to mount on a balancing machine. The hole is just from the stamping process and is NOT machined to center it. 
Earlier this summer, I bought a set of new BFG's from a local guy and when I drove the car the vibration was terrible. Knowing what the problem was, I took the car to another tire shop where they balanced them properly, no more vibrations.
I just thought I'd mention that.
Geoff.

I learn something new every day!
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#37
(11-22-2019, 09:29 AM)Stanglover Wrote: I've not gone back to check your earlier thread on this or stuck my nose into this one, but I don't remember if you mentioned what wheel rims you have on your car. I'm assuming factory with hub caps, BUT if by chance you have Magnum 500's, likely aftermarket, then these wheels MUST be balanced on a centering adaptor. One cannot use the wheel center to mount on a balancing machine. The hole is just from the stamping process and is NOT machined to center it. 
Earlier this summer, I bought a set of new BFG's from a local guy and when I drove the car the vibration was terrible. Knowing what the problem was, I took the car to another tire shop where they balanced them properly, no more vibrations.
I just thought I'd mention that.
Geoff.
Geoff,
In the video link I posted he shows the adapter to use for the Magnum 500 and in this case the GM aluminum wheels need it. 
That is one reason I do not like the Mag. 500 there is nothing to center it on the hubs but the lug nut holes and that is not very good.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
  Reply
#38
(11-22-2019, 10:11 AM)Carolina_Mountain_Mustangs Wrote:
(11-22-2019, 09:29 AM)Stanglover Wrote: I've not gone back to check your earlier thread on this or stuck my nose into this one, but I don't remember if you mentioned what wheel rims you have on your car. I'm assuming factory with hub caps, BUT if by chance you have Magnum 500's, likely aftermarket, then these wheels MUST be balanced on a centering adaptor. One cannot use the wheel center to mount on a balancing machine. The hole is just from the stamping process and is NOT machined to center it. 
Earlier this summer, I bought a set of new BFG's from a local guy and when I drove the car the vibration was terrible. Knowing what the problem was, I took the car to another tire shop where they balanced them properly, no more vibrations.
I just thought I'd mention that.
Geoff.
Geoff,
In the video link I posted he shows the adapter to use for the Magnum 500 and in this case the GM aluminum wheels need it. 
That is one reason I do not like the Mag. 500 there is nothing to center it on the hubs but the lug nut holes and that is not very good.
 David, yes for sure the Magnums are a PITA. The amount of weight needed for each wheel was very different, from about 1 oz to 6ozs. and that is the difference with the rims themselves. Egg shaped holes is why I had to buy a new set a few years back. The reason, people insist on using impact wrenches to tighten them without allowing the lug nuts to center themselves. Always do these by hand, then torque.

I learn something new every day!
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#39
In a previous thread on the same subject, he states he has Magnum 500 rims and replaced one.

https://www.7173mustangs.com/thread-stee...#pid354660


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#40
(11-22-2019, 01:45 PM)Hemikiller Wrote: In a previous thread on the same subject, he states he has Magnum 500 rims and replaced one.

https://www.7173mustangs.com/thread-stee...#pid354660
 Yes, I seem to recall that now. Thanks for searching that and posting the link.

I learn something new every day!
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