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post #1 of (permalink) Old 09-16-2003, 12:51 AM Thread Starter
 
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York pulley size

I have aquired two yorks. One has a tag that confirms its a 10cfm, the other has an AMC tag that tells me nothing. So I pulled the pulleys off of both (kudos to the engineer that designed that!!! Pretty simple!) Anyway, they both have a shaft that id's them as 10cfm, but one has a 6" pulley and the other has a 7" pulley.

I would imagine that the internal dimensions of these things are the same, but to get the same output from these pumps, shouldn't they have matched pulleys??

Other than finding a new clutch/pulley that match, whats to say that putting on a smaller pulley assembly won't bump up the output?? I don't have my calculator here, so I can't see exactly how much it will change the output...but nonetheless I am curious!

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post #2 of (permalink) Old 09-16-2003, 08:58 AM
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Re: York pulley size

What size are the crank pulleys of the engine they came off of? Without knowing the diameter or the crank pulleys, the question can't be answered.
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post #3 of (permalink) Old 09-16-2003, 09:28 AM Thread Starter
 
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Re: York pulley size

very true, I didn't even think of that... Could be why I failed calc so many times.... I only have one of the crank pulleys, so I guess I will make sure that ends up my 304, though off the top of my head, this one and the 304 are the same.
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post #4 of (permalink) Old 09-16-2003, 12:42 PM
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Re: York pulley size

They are rated for 10cfm at a certain rpm. (Whether that is pump rpm or crank rpm, I don't know.) All you have to do is figure out what rpm the pump has to have, then figure out through your pulleys how many rpm the engine needs to be turning. The different size pulleys won't change the pump curve, just the rpm of the engine to achieve the output you want.
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post #5 of (permalink) Old 09-16-2003, 11:16 PM Thread Starter
 
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Re: York pulley size

That makes more sense than my backwoods thinking..... I just assumed a 10cfm was gonna have the same size pulley, but they are made for different applications and likely come with many different setups. All I want to do is fill up the 35's, I really don't need to break out an air chisel on the trail (with enough beer and ribbin' from friends though.... that could be ugly!)

Thanks for the info!
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