Re: {Chrysler 300} 300F Engine Dyno Results

On Sunday, January 14, 2024 at 7:03:00 PM UTC-6 c300 wrote:

I found this to do a good job of how the “5252” constant was derived: Horsepower equals torque times rpm divided by 5,252. The constant 5,252 comes from the fact that the end of a one foot lever travels 6.283 feet (pi times the two foot diameter of the circle made by the end of the one foot lever) in one complete rotation and dividing that distance into 33,000 equals 5,252.

Specifically: Constant=33,000/(2 Pi)=5252.113….. and: Since HP=(T X RPM)/5252, then, if RPM=5252, then HP=T

QED. Yes. Moving on.

Rich Barber in partly cloudy Brentwood CA.

From: chrysler-300-cl...@xxxxxxxxxxxxxxxx <chrysler-300-cl...@xxxxxxxxxxxxxxxx> On Behalf Of ridgleyracing65

Sent: Sunday, January 14, 2024 4:35 PM
To: Chrysler 300 Club International <chrysler-300-cl...@xxxxxxxxxxxxxxxx>

Subject: Re: {Chrysler 300} 300F Engine Dyno Results

Ray: I will try, but don't want to type a "novel". One hp is the amount of power it takes to perform 33,000 ft-lb of work in one minute based upon James Watt's observations of a horse operating a gear driven pump pulling a lever connected to the pump (think dyno). Therefore, 1 hp represents the production of 33,000 ft-lb of mechanical energy per minute. So HP = ft-lb per minute divided by 33,000. 6.28 ft-lb of work is equal to about 1 ft-lb of torque. 33,000 divided by 6.28 equals 5,252. This is an over simplification, but you can get the general idea of where the 5,252 comes from.

Dyke Ridgley

On Sunday, January 14, 2024 at 5:59:38 PM UTC-6 rfmelton wrote:

I've seen that equation since high school, but I never thought to ask: where did that 5252 constant come from?

Ray Melton

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On 1/11/2024 9:10 PM, ridgleyracing65 wrote:

Tom:

Horsepower is a mathematical calculation. BHP= torque X rpm divided by 5252. That is why torque ALWAYS equals bhp at 5,252 rpm. The torque and horsepower curves on dyno graphs ALWAYS cross at 5, 252 rpm. Many years ago, the best description of torque vs bhp I ever heard was think of a door swinging on its hinges. Torque determines the size of the door that can be swung. Horsepower determines how fast the door can swing. Farm tractors can swing a very large door, but cannot move it very fast. Race cars move the door really fast, but cannot swing a very big door.

Dyke Ridgley

On Thursday, January 11, 2024 at 8:21:16 PM UTC-6 James Douglas wrote:

Yes, but the slope of the curves should be similar. James

From: chrysler-300-cl...@xxxxxxxxxxxxxxxx <chrysler-300-cl...@xxxxxxxxxxxxxxxx> On Behalf Of dplotkin
Sent: Thursday, January 11, 2024 1:44 PM
To: Frederick Grossi <e55g...@xxxxxxxxx>; chrysler-300-cl...@xxxxxxxxxxxxxxxx
Subject: RE: {Chrysler 300} 300F Engine Dyno Results

The original ratings were gross. Today's ratings are net.

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------

From: Frederick Grossi <e55g...@xxxxxxxxx>

Date: 1/11/24 12:53 PM (GMT-05:00)

To: chrysler-300-cl...@xxxxxxxxxxxxxxxx

Subject: {Chrysler 300} 300F Engine Dyno Results

Hello Group,

The rebuild on my 300F engine has been completed and the engine rebuilder sent it to the dyno for break-in, running condition and leak detection.
The engine is stock, stock carburetors and ram intake manifold, stock bore (it was sleeved because of pitting on a couple of the cylinder walls), as stock a cam as you can get, same crankshaft and pistons. The engine was rebuilt by someone else in 1995 before I owned the car. The engine was bored .004 at that time.
My rebuilder wanted to share the results with our group to see if anyone else had similar experiences:

Maximum engine torque - 2,900 rpm- 496 ft. lbs.
Maximum horsepower - 4,600 rpm - 316 hp

The horsepower is about 16% lower than factory specifications of 375hp.
Has anybody else had this differential in hp from factory? Is this normal?

Thank you,
Fred Grossi
Pegram, TN

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