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Tool Talk Discussion Forum

Calling Roger... Brunner compressor

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MikeCatthemuseum

10-14-2005 10:45:18

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I was referred to this board by one of the guys over at Practical Machinist. I have a Brunner compressor pump. Cast iron, single cyl, single stage. Only numbers are "203" cast into the barrel of the cyl just below the fins and above the base plate. Any ideas on the capacity of this compresor, speed suggestions and motor hp?

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XXXRogerxxx

10-14-2005 14:54:37

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Re: Calling Roger... Brunner compressor in reply to MikeCatthemuseum, 10-14-2005 10:45:18

If you pull the cylinder head and get bore X stroke, take the displacement in cubic inches and divide by 10. This will give you the horsepower requirements of the pump. Estimate approximately 4cfm per hp @ 100psi. You can play with pulleys and rpm and pressure settings all you want, but 125psi is about the practical maximum for a single stage pump. If you sheave the motor for maximum amp draw at that pressure, you should be in the ballpark rpm wise. I'd keep rpm below 1000 though, compressors just seem to prefer that, unless specifically designed otherwise. Use some good non-detergent, straight 30 weight oil, good quality compressor oil (Shell Corena 122 or equivalent), or some even use Mobil 1 to good effect, but avoid multigrade engine oils.

As you are active on a machinist site, I'll mention that finding valves is the hardest part of rebuilding an old compressor that's out of production. You may try your hand at fabricating new ones, depending on the style. Brunners used a lot of reed valves, so it may be a challenge. They also used a lot of fiddly little dowels and pins and stuff. If you're up to the challenge, they are certainly sturdy old buggers.

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MikeCatthemuseum

10-14-2005 19:22:42

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Re: Calling Roger... Brunner compressor in reply to XXXRogerxxx, 10-14-2005 14:54:37

Thanks Roger. I was trying to avoid pulling the head as, knowing my luck, I'll probably demolish the gasket and will find out they are made of unobtanium.

I figure I can measure the barrel diam, subract a little for wall thickness to get the bore, then maybe pull a valve (this one does not look like it has reeds) and see if I can get a stick on top of the piston to measure stroke. Had not heard the divide displacement by ten. I love rules of thumb like that.

I figured it was a 90psi pump max and maybe 2-3hp. This just looks like the old gas station service bay compressors I remember seeing as a kid.

I have a 3hp 875rpm motor an a 5hp 1100 rpm. I'll see which one seems best.

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JL Sargent

10-14-2005 12:16:49

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Re: Calling Roger... Brunner compressor in reply to MikeCatthemuseum, 10-14-2005 10:45:18

I dont know much about Brunner but....
Hey, wait a minute, we already did that.
Have you searched here for Brunner? Might find your info that way. xxxrogerxxx may show up. He seems to know old pumps bout as good as anybody. He has absolutely helped me before.

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MikeCatthemuseum

10-14-2005 19:25:45

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Re: Calling Roger... Brunner compressor in reply to JL Sargent, 10-14-2005 12:16:49

I have actually searched here a bit. I was hoping maybe somebody would say, "Oh yeah, I got one like that, blah, blah, blah" saving me from having to pull the head, etc... No such luck.

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