[C2] Vibration
06-02-2021, 05:43 AM
#1
5th Gear
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Vibration
Between 55 and 65 miles per hour i have a light vibration on the car i have replaced a bad spindle and calibrate al my drive shafts but still light vibrations.
All the wheels have been balanced to
Now i am thinking to replace the Harmonic balancer.
Had any one had the same problem?
All the wheels have been balanced to
Now i am thinking to replace the Harmonic balancer.
Had any one had the same problem?
06-02-2021, 07:11 AM
#2
Race Director
Check the transmission rear bushing and yoke for looseness and the drive shaft u-joints for wear/failure, missing balance weights, other damage. But you probably need to do some testing like getting up to speed and putting the transmission in neutral and the engine at idle and see if you experience the vibration as it coasts through the speed range. If you do it’s probably not in the engine.
06-02-2021, 07:14 AM
#3
Le Mans Master
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If you rev the car in neutral to the same rpm setting still, do you get the vibration? When you push in on the clutch or shift an auto into neutral at 55 - 65 mph does the vibration go away or remain. Automatic or manual transmission? Did the vibration begin after a maintenance parts replacement e.g., clutch?
You say 'still' light vibrations, so the drive shaft work did reduce the vibration?
You say 'still' light vibrations, so the drive shaft work did reduce the vibration?
Last edited by R66; 06-02-2021 at 07:15 AM.
06-03-2021, 01:01 PM
#8
Le Mans Master
Understanding Road Force
Why Do We Balance Wheels? – Understanding Road Force
Good luck... GUSTO
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SWCDuke (06-03-2021)
06-03-2021, 02:54 PM
#9
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Give us a better description of the vibration, like where you think it's coming from. The steering wheel? The seat cushion?...
The speed range you stated is typically where you feel vibration from an out of static balance front wheel/tire or a "road force" issue due to a varying side wall "spring rate" around the circumference of the tire, or excess wheel or tire runnout. As little as a spark plug width can induce an annoying vibration in the steering wheel.
Going back about 30 years most wheels and tires are "match marked." On the tire you will find a red "dot" and on the wheel just below the curve of the mounting flange a faint white or silver dot about quarter inch in diameter. Match these up and you have the roundest assembly. This was not done to OE wheels or tires when out cars were built and the cheap van and trailer tires that most guys buy probably don't have the red dot, but having the assembly analyzed on a Hunter GSP 9700 will tell the operator where to rotate the tire on the wheel to get the roundest assembly.
Duke
The speed range you stated is typically where you feel vibration from an out of static balance front wheel/tire or a "road force" issue due to a varying side wall "spring rate" around the circumference of the tire, or excess wheel or tire runnout. As little as a spark plug width can induce an annoying vibration in the steering wheel.
Going back about 30 years most wheels and tires are "match marked." On the tire you will find a red "dot" and on the wheel just below the curve of the mounting flange a faint white or silver dot about quarter inch in diameter. Match these up and you have the roundest assembly. This was not done to OE wheels or tires when out cars were built and the cheap van and trailer tires that most guys buy probably don't have the red dot, but having the assembly analyzed on a Hunter GSP 9700 will tell the operator where to rotate the tire on the wheel to get the roundest assembly.
Duke
06-25-2021, 10:05 AM
#10
Tether Man
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2023 C2 of the Year Finalist - Modified
2022 C2 of the Year Finalist - Unmodified
2019 C1 of Year Finalist (appearance mods)
Very interested in this Thread:
My Vibration causes the rear view mirror to vibrate @ 60+mph to the point of not being usable......1967 BB L71.
I plan to have my universal Joints replaced when I have the Drive Shaft checked for Balance.
Assumption: I was driving about 2 months ago at 65MPH and something hit under my Passenger side Cargo storage. With my current Vibration, that noise possibly could have been a "thrown" Drive Shaft balancing weight if there was one????
I will let the OP know what I find out......
My Vibration causes the rear view mirror to vibrate @ 60+mph to the point of not being usable......1967 BB L71.
I plan to have my universal Joints replaced when I have the Drive Shaft checked for Balance.
Assumption: I was driving about 2 months ago at 65MPH and something hit under my Passenger side Cargo storage. With my current Vibration, that noise possibly could have been a "thrown" Drive Shaft balancing weight if there was one????
I will let the OP know what I find out......
Last edited by dcamick; 06-25-2021 at 10:45 AM.
08-17-2021, 06:59 PM
#11
Tether Man
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2023 C2 of the Year Finalist - Modified
2022 C2 of the Year Finalist - Unmodified
2019 C1 of Year Finalist (appearance mods)
Follow up to my post on this subject...........After full driveline inspection it was found that my tires particularly left rear was out of round........I am now in the process of looking at tire replacement......