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Hit & Miss Gas Engine Discussion

What is the Horsepower of this Engine?


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  #1  
Old 06-03-2012, 05:48:32 AM
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Denis Rouleau Denis Rouleau is offline
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Default What is the Horsepower of this Engine?

What is the formula to calculate the horsepower of a given engine?

This specific engine has no name tag but I know the RPM is 260, the bore is 8-1/2 inches and the stroke is 14 inches. The flywheels are about 45 inches in diameter with a 3 inch face, it this info is needed to help determine the horsepower.

Thanks!

Denis Rouleau
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Old 06-03-2012, 09:18:32 AM
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Elden DuRand Elden DuRand is offline
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Default Re: What is the Horsepower of this Engine?

Denis:

I don't think you can really get a good idea of horsepower from calculating off bore, stroke and RPM. It has too much to do with compression ratio, cam profile, port size, etc.

The best way would be to rig-up a Prony brake on the rim of the flywheel. Extend the arm of the brake to a distance far enough from the center of the crankshaft to be able to mount a scale.

Put a scale at the end of the arm.

Start the engine and tighten the brake until it just starts to fall on it's face and note the pressure on the arm.

Now, take the pressure and multiply it by the length of the arm in feet. (if the arm is 18" and the pressure is 20 lbs, the torque will be 20# times 1.5' or 30 ft/lb).

Now, using the formula, H.P.= TN/5252
where T= Torque in ft.lb
where N= RPM

At least, this will get you an accurate figure.

Of course another way would to find a similar engine and look at the data plate

"Hepful", ain't I. Nyuk, nyuk.

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Old 06-03-2012, 09:44:30 AM
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Default Re: What is the Horsepower of this Engine?

Quote:
Originally Posted by Elden DuRand View Post
Of course another way would to find a similar engine and look at the data plate [/url]
I do not know of a similar engine to compare it with. This engine is at least a 10hp and possibly as much as a 16hp. I was hoping to narrow it down a bit more.

Denis Rouleau
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Old 06-03-2012, 10:02:30 AM
Rick I Rick I is offline
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Default Re: What is the Horsepower of this Engine?

I think this is what you may be looking for-

from Loetzer's Hand-book, 9th Edition, 1913, via http://rustyiron.com/Articles/horsepowerofgaso.html :

Multiply the area of the cylinder by the length of stroke in inches and that product by the number of revolutions per minute then divide by the constant 10000 for two-cycle or 13400 for four-cycle engine, the result will be the I.H.P. (Indicated [theoritical] HP).

-Rick

---------- Post added at 10:02 AM ---------- Previous post was at 10:00 AM ----------

[sp] "theoretical" that is
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Old 06-03-2012, 10:59:31 AM
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Denis Rouleau Denis Rouleau is offline
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Default Re: What is the Horsepower of this Engine?

Quote:
Originally Posted by Rick I View Post
Multiply the area of the cylinder by the length of stroke in inches and that product by the number of revolutions per minute then divide by the constant 13400 for four-cycle engine, the result will be the I.H.P. (Indicated [theoritical] HP).
I had to look up "area of a circle" as I last used the formula over 45 years ago.............pie r square!

Here is the result for the engine referred to here:
(56.74 X 14 X 260) divided by 13400 = 15-1/2 HP.

Close enough for me!

Denis Rouleau
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Old 06-03-2012, 07:13:29 PM
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Elden DuRand Elden DuRand is offline
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Default Re: What is the Horsepower of this Engine?

Quote:
Originally Posted by Denis Rouleau View Post
.............pie r square!

Denis Rouleau
Denis:

Sorry, but you're wrong, Pie r round! Cornbread r square!

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Old 06-03-2012, 09:57:27 PM
GlenK GlenK is offline
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Default Re: What is the Horsepower of this Engine?

Eldin , you said it before me . One of my teachers got mad when I said ,pie r round , cake r square .
Glen
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