Noise at higher RPM?

CaliforniaBorn36

CaliforniaBorn36

Senior Member
I wish some FordBarn members could hear this in person as I know that is the first suggestion I’ll get, but in the meantime, I am trying to figure out what might be causing the noise you will hear in the video toward the end.

I have owned this car since 2012 and this noise is new. As you will hear in the video...

1. it is not constant and only occurs when the engine is spinning at a pretty good RPM.

2. If I am accelerating or decelerating no noise, only during that point in the pedal when you are basically cruising, like everything has no force on it one way or the other.

3. I am not feeling anything in the pedals, steering well, shifter or the seat of my pants

4. I can get this to occur in the driveway, so not driving, just recorded during driving so you can see that everything sounds pretty good up until that speed.

Thoughts? I hate to just drive around at 25 moh for the rest of the time I own this vehicle

BTW, original 1936 21 stud flathead motor


https://youtu.be/UCqc3T87si0
 
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Try removing belt, drive it and listen for squeal. If it goes away, then either the water pumps or generator. Have you greased the pumps or lubed the generator?
 
How is the oil pressure holding up. If the mains are that loose, I would be surprised to see over 5 psi at idle or over 25 at speed.
 
Its time to drain the oil. Check/visually inspect the drained oil for metal particles. Use a magnet to attract any metal particles in the drained oil....
 
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Had the exact same problem with an 8ba engine. It was suggested that the combination of close piston top to head clearance and the rod bearing "float" under the described driving conditions causes the slightest noise as described. I had the heads domed for slightly more piston clearance. problem solved.
Thanks to Clyde at C&G.
Mark
 
Well you might be right about the carbon build up.
In the original 33 engine it had a carbon build up on the pistons that hit the heads ,I sounded like it had hammers tied to the crankshaft
Lawrie
 
I have had rattles kind of like that just due to engine vibration at certain speeds. I have changed and tightened a bunch of things on the body to get rid of it. This was a model A although, they had more resonant frequencies inherent. I could feel it when I once had a rear main knock. Bad rods usually knock when decelerating.
 
Oil pressure 25 lbs at idle about 40 lbs cruising. Engine running between 165 and 180 degrees, so not overheating either.

Thanks for all the input.
 
I don't think the sky is falling. I think the head mounted water pumps dried out during winter storage. :p
 
Are you sure it an engine noise. You can push the clutch in at speed and see if the noise goes away while costing at speed. The noise to me sounds more from inside the car. I had a similar noise and it turned out to be the speedometer. After a little lube it worked fine.


Sent from my iPad using Tapatalk
 
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