Re: What about the 25K 105mph V8 Patrician?
Posted by Rusty O\'Toole On 2011/4/9 1:00:06
Quote:
Some quick calculations reveal that at 100 MPH the engine would be revving 3838 RPM and at 110 MPH the engine would be revving 4221 RPM. This is assuming stock size 8.00 15 tires, 31" diameter and stock 3.54 rear axle ratio.
Peak HP is given as 260@4600 RPM. 4600 RPM would be within an eye blink of 120 MPH. Fastest lap in the test is given as 114 average for the 2 1/2 mile track which would be 4375 RPM.
It seems quite possible the car ran at a sustained 4000 to 4500 RPM for 25000 miles. It would actually be less strain on the engine to run at or near its power peak. The fact that the run took place in the rain is significant. The air resistance of the big Patrician body must have been tremendous. The same run at the high altitude Bonneville salt flats, in thin dry air, would have cut the power required by half.It must have taken full throttle and full horsepower to push the big Patrician through the cold dense wet air at 100+ MPH.
As to how the oil pump stood the gaff, I believe that most Packard V8s never had any trouble with their oil pumps although a small but significant number did.
The story states that the first effort had to be aborted at 10,000 miles due to lifter failure and a whole new engine installed. This could have been caused by a bad oil pump and the company quite naturally tried to minimize the bad publicity by calling it lifter failure.
chuck wrote:
I've always suspected that the 25k test 55 Patrician had a higher rear end ratio than the 3.54 which was standard. Does anyone know what rear end ratio this car had?
Some quick calculations reveal that at 100 MPH the engine would be revving 3838 RPM and at 110 MPH the engine would be revving 4221 RPM. This is assuming stock size 8.00 15 tires, 31" diameter and stock 3.54 rear axle ratio.
Peak HP is given as 260@4600 RPM. 4600 RPM would be within an eye blink of 120 MPH. Fastest lap in the test is given as 114 average for the 2 1/2 mile track which would be 4375 RPM.
It seems quite possible the car ran at a sustained 4000 to 4500 RPM for 25000 miles. It would actually be less strain on the engine to run at or near its power peak. The fact that the run took place in the rain is significant. The air resistance of the big Patrician body must have been tremendous. The same run at the high altitude Bonneville salt flats, in thin dry air, would have cut the power required by half.It must have taken full throttle and full horsepower to push the big Patrician through the cold dense wet air at 100+ MPH.
As to how the oil pump stood the gaff, I believe that most Packard V8s never had any trouble with their oil pumps although a small but significant number did.
The story states that the first effort had to be aborted at 10,000 miles due to lifter failure and a whole new engine installed. This could have been caused by a bad oil pump and the company quite naturally tried to minimize the bad publicity by calling it lifter failure.
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