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08-28-2013, 11:29 AM | #1 |
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Join Date: Oct 2012
Location: Randburg, Johannesburg, South Africa
Posts: 225
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Vibration travelling at speed
Good evening folks,
Seems like it's my weekly cry for help! I took my 1930 Sport Coupe down the freeway on Sunday, and any speed over 40 to 45 mph created a bone-jarring vibration which felt like it didn't come from the wheels. What could cause this? Kind regards Mike |
08-28-2013, 03:28 PM | #2 |
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Join Date: Jul 2011
Location: Southwestern Connecticut
Posts: 931
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Re: Vibration travelling at speed
I know you said it didn't feel like it came from the wheels, but that sure sounds like wheel balance to me... or possibly a bent wheel.
Rule of thumb, if you feel it in the steering wheel, it is a front wheel. If not, it is a rear wheel.
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08-28-2013, 03:45 PM | #3 |
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Join Date: Jan 2011
Location: Colorado Springs
Posts: 868
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Re: Vibration travelling at speed
While traveling at high speed, try pushing in the clutch. Do you still feel the vibration? If so, it may be the wheels. If not, it may be the engine, u-joint or other possibilities.
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08-28-2013, 03:46 PM | #4 |
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Join Date: Nov 2011
Location: B.C. Canada
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Re: Vibration travelling at speed
A safe cruising speed for a bone stock A is around 45 mph.Due to the lack of counterweights on the crank shaft,they will vibrate around that speed.Prudent drivers would limit their speed to 45.If all internal parts are properly balanced,the engine will be very smooth,but without C- weights it is hard on the center main brg.To many drivers these days, push their cars beyond beyond there design limits.If you want to drive faster on todays roads,then install an overdrive & a 5.5 cyl head
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08-28-2013, 05:07 PM | #5 | |
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Re: Vibration travelling at speed
Quote:
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08-28-2013, 07:35 PM | #6 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Vibration travelling at speed
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08-28-2013, 07:56 PM | #7 |
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Join Date: Dec 2012
Location: Lindsay, Ontario, Canada
Posts: 12
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Re: Vibration travelling at speed
I know there are 2 schools of thought on this but here goes: I remember years ago (maybe 25 years) my grandfather's 30 Roadster would not go over 40 mph without vibrating itself to pieces. He installed a Float A Motor kit and that solved the problem of the vibration. The car is now mine and it will run along at 50 mph no problem. Are my bearings still taking a beating and the FAM kit is just masking it?
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08-28-2013, 08:39 PM | #8 |
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Join Date: May 2010
Posts: 4,179
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Re: Vibration travelling at speed
Just my humble opinion:
With a stock Model A engine, original head & cam, original transmission & differential, & everything else original including a dead flat windshield with the visor scoop above; & the two (2) normal Model A open, front fender air scoops, I would be most hesitant to cross a tall, Mississippi River Bridge, in a mild 40 mph rain storm cross wind at one (1) mph over 50 mph unless I had five (5) extra heavyset Wal-Mart shoppers crammed in the Model A with me. Not sure if all (5) could fit -- but, just a compassionate "Safety" suggestion for a new Model A driver trying to drive his/her newly acquired "stock" Model A at high speed for the first time. Last edited by H. L. Chauvin; 08-28-2013 at 08:40 PM. Reason: typo |
08-28-2013, 11:11 PM | #9 | |
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Join Date: May 2010
Location: Mpls, MN
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Re: Vibration travelling at speed
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08-28-2013, 11:13 PM | #10 |
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Join Date: Oct 2012
Location: Randburg, Johannesburg, South Africa
Posts: 225
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Re: Vibration travelling at speed
Thanks for the advice everyone, To get it straight, I'm not looking to push the old girl beyond 45, it's just that I noticed the vibrations which worried me a little. Saturday I am getting some different wheels, so I will check her out after that.
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