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Oil Field Engines & Related Equipment

Oil City half-breed


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  #11  
Old 02-21-2012, 08:12:30 PM
FArmstrong FArmstrong is offline
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Default Re: Oil City half-breed

This engine has a hot tube ignition with smaller (original?) flywheel on left and heavier (after market - combustion conversion?) flywheel on right side. Not sure if the smaller flywheel is welded to the crank, I will check.
Fred
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  #12  
Old 02-21-2012, 08:18:25 PM
FArmstrong FArmstrong is offline
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Default Re: Oil City half-breed

Here is a picture of Bob's engine
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  #13  
Old 02-21-2012, 09:05:44 PM
Troy S Troy S is offline
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Default Re: Oil City half-breed

Chris, Your engine should be a 20hp. Most 15 hp engines (half breeds) have a 9" bore. 10 1/2" bores should be 20hp. Most, but not all of the steam engine beds have a stroke of 12" or there around. Half breed engines come in all kinds of shapes and sizes, but most are 20hp and under. The steam engine beds couldn't handle much more than that. I have a few with bores as small as 7 1/2" I have never saw one with a 15" bore like the one farmstrong is asking about. Troy
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Old 02-21-2012, 09:39:25 PM
Andrew Mackey Andrew Mackey is online now
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Exclamation Re: Oil City half-breed

Maybe ours is larger than 20, with the longer stroke? Most, but not all the OCSP engines I have seen have the steam flywheel welded to the crank. Apparrently, the steam side flywheel can't take the extreme accelleration the gas cylinder puts out, so it breaks loose the jib key. Of the 7 engines I saw at the Coolspring show, 3 years ago, all but one had a welded steam flywheel, including the one I had just purchased for my engine club. If you look in the archives, My son posted a video of the club's engine on it's inaugural run.
Andrew
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Old 02-21-2012, 11:00:49 PM
Troy S Troy S is offline
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Default Re: Oil City half-breed

Guess I lucked out with my 20hp SP/OC other than a shim the steam flywheel it is in really good shape. Even the hollow ends are complete and not all broke up like you see alot of the time. The SP cylinder # is 1791 if any one is keeping track.
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Old 02-22-2012, 02:06:08 PM
Troy S Troy S is offline
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Default Re: Oil City half-breed

You have to remember, when you are talking about different size bores especially when it comes to half breeds. Even if they may have a half inch or so difference in the bore. The engines may still be considered the same hp depending on what rpm you run them. Same as most other companies did by adding more rpm to an engine to pick up some extra hp with out changing the bore and stroke for the next model year. Troy
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Old 02-23-2012, 11:05:47 AM
Andrew Mackey Andrew Mackey is online now
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Exclamation Re: Oil City half-breed

If you want to read about the restoration of the OCSP engine, my engine club has, see the artical I wrote for the GEM. It spans 6 issues, starting on Sept.2009, Vol.44#6. At the time, it was heavily edited, ands soon after, GEM put the articals on th web, in their entirety, without the editing.(good change!) Our engine has S/N 4827 stamped on the cylinder. We bought the engine from Tom Schoolcraft. In the artical, I see that Tom told us it was actually a 15 HP. From what I had read, I thought it was a 20, and that's what we put down on our info. So who knows, for sure? Do any company records exist? To recap - Bore 101/2" Stroke 17", one light and one heavy flywheel. Oil City bed frame. We were told that the base was 1880s vintage, the conversion made in the 1890s area. Engine was first used in the area of McFarland, W.VA, not far from PA border, as a steam engine, with portable boiler, from what I could gather. It pumped oil into the 1960s.
Andrew
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Old 02-24-2012, 11:55:16 AM
Troy S Troy S is offline
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Default Re: Oil City half-breed

Farmstrong, I sincerely do not wish to doubt you, but are you positive the piston is 15"? I did some calculating and a two cycle with a bore of 15" and lets say a 12" stroke running at 170rpm would calculate to right around a 36+/- hp engine. Even the Oil City beds with the large crank, I don't think would ever stay together. Let me say again, I don't doubt you, I'm just saying that seems like a lot...

Andrew, If you calculate your engine given it has a 10 1/2" bore and a 17" stroke running at around 170rpm it would work out to around a 25 hp

I have always enjoyed messing with half breeds. There are so many combinations out there. Its interesting to see so many different cylinders wind up on so many different beds...
Troy
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  #19  
Old 02-24-2012, 12:46:45 PM
Andrew Mackey Andrew Mackey is online now
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Exclamation Re: Oil City half-breed

I know one thing - the 4" exhaust on this puppy sure draws a crowd at the Sussex County Fair, when I start it! 25HP? Well, that's a big jump from the 15 Tom told me, when I bought it! I guess We will have to change the signs on the engine enclosure! For those interested, the engine now has a permanant roof over its mount, to keep the weather off it during the winter months, a wind break is mounted to the poles supporting the roof.
Andrew
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  #20  
Old 02-24-2012, 05:45:01 PM
Troy S Troy S is offline
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Default Re: Oil City half-breed

Andrew, Here is the formula I have used for years to calculate the HP of a two cycle engine. B x B x S x rpm x .7854 divided by 10,000 Calculating the HP of a two cycle engine is always a +/- kind of deal. I'm not telling you for sure that your engine is truly a 25 hp. I just used the formula with the info you gave. 10.5" x 10.5" x 17" x 170 x .7854 / 10,000 = 25.02 hp. The engine may have run at a much slower rpm such as 150 that would be closer to 22 hp. If the suggested rpm was closer to that they may of still considered it a strong 20 hp. It's all in what you want to call it... Troy
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