Building a Power Model Water Pump

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Builder01
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Re: Building a Power Model Water Pump

Post by Builder01 »

Hi John,

Yes, a steam operated pump is an "extra" bit of jewelry that is usually added after everything else is done.

Is your injector English because it came from England? I just recently got my injector installed and working. It is from Blackgates in England. It seems to work pretty well and was not too expensive even with shipping.

David
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John_S
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Re: Building a Power Model Water Pump

Post by John_S »

My injector is English style, but I cannot confirm its origins. It was in a box of random bits and pieces that my father picked up at an estate sale of a gentleman in TN that passed away in the mid 1980s. It works on and off, up to 80psi, but catches a lot of trash in the cones and quits working. The SuperScale economy on the engineer's side never has any issues at all.
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Builder01
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Re: Building a Power Model Water Pump

Post by Builder01 »

What is the difference between an English and an American style injector?

David
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Bill Shields
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Re: Building a Power Model Water Pump

Post by Bill Shields »

BA threads?
Too many things going on to bother listing them.
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Fred_V
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Re: Building a Power Model Water Pump

Post by Fred_V »

Builder01 wrote:What is the difference between an English and an American style injector?

David
About 100 bucks.
Fred V
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Builder01
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Re: Building a Power Model Water Pump

Post by Builder01 »

Actually my injector from England has model engineer threads. The difference in price might even be more than $100, that is, the English injector is $100 less than one from the U.S. and it works just fine. This cannot truly be the definition of an "English" injector?

The question remains, what is the difference between an English and an American style injector?

David
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Fred_V
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Re: Building a Power Model Water Pump

Post by Fred_V »

Here are some pix of the typical English and a cutaway of the Penberthy which was the prototype for both the Ohlenkamp and the Superscale. The american designs have a sliding washer or start valve (item C) that aids in getting the unit started.
Attachments
INJECTOR_cut-a-way no8.jpg
penberthy cutaway.jpg
penberthy cutaway.jpg (32.29 KiB) Viewed 5615 times
Fred V
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Bill Shields
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Re: Building a Power Model Water Pump

Post by Bill Shields »

NAH....that's really not a valid distinction.

Item C is a check valve....and has nothing to do with getting it started

both the Brits and the 'Mericans (and the Germans / Italians / French) used adjustable cones on full-size injectors.

Many American injectors were horizontal, some were vertical...had more to do with where it was mounted than anything else.

Injectors below the cab tended to be vertical. Those stuck in the back-head often (usually) horizontal.
Too many things going on to bother listing them.
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Builder01
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Re: Building a Power Model Water Pump

Post by Builder01 »

Interesting!! Looks like the "American" type is also vertical instead of horizontal. Are the miniature American types really fabricated like the drawing, or, is this for a full size? This would seem unnecessarily complicated to make in miniature.

Looks like the over flow check ball has fallen out of the cut away injector. Nothing to keep it in once cut in half!

English types are also available in vertical and look pretty much the same. Since both devices do the same thing, there is not really much difference. I suspected as much.

David
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Bill Shields
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Re: Building a Power Model Water Pump

Post by Bill Shields »

an injector is an injector is an injector.

they all work on the same principle:

part science
part black magic
Too many things going on to bother listing them.
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Greg_Lewis
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Re: Building a Power Model Water Pump

Post by Greg_Lewis »

Bill Shields wrote:an injector is an injector is an injector.

they all work on the same principle:

part science
part black magic
What gets me is how old Hank Giffard figured it out in the first place. Back in 1858 they didn't have the computers and scientific instruments we have today to do much of the brain work. What motivated him to try, and, considering how finicky these things can be, how did he get it right and not give up?
Greg Lewis, Prop.
Eyeball Engineering — Home of the dull toolbit.
Our motto: "That looks about right."
Celebrating 35 years of turning perfectly good metal into bits of useless scrap.
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John_S
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Re: Building a Power Model Water Pump

Post by John_S »

Here's the injector I have.
englishInjector.jpg
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