Join Date: Jan 2000
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Re: Onboard air - 2.5 or 1.25 gallon tank???????
Go with whatever fits better, but you would be happier with the 2.5 gallon. The size of the tank equals how long you'll be able to run tools before low pressure kicks the compressor back on. Volume is not the same as pressure, the York needs to fill a volume to create the pressure. You woudn't be happy with it at all without any tank. Think about the difference between the 25 gallon home units on wheels and the 80 gallon uprights. The compressor fills a larger volume, and thus has to cycle less while you work. You get higher useable pressure for a longer time. If you plan on using an impact wrench, for example, the larger tank will allow you more full-pressure "hits" than the smaller one before you have to wait for the compressor to build pressure to a useable level so you can work again. Even filling tires you'll have to wait less with a 2.5 gallon tank vs. the 1.25 gallon, but you still will have to wait for the compressor to fill the tank. The tank isn't just a volume in the system, it's the storage vessel for the pressure. Your system (basic) should be compressor > check valve > pressure switch > tank, so you have a storage tank of compressed air. Your compressor will fill the volume, hit the high limit of the pressure switch and shut off. When the pressure in the tank reaches the low limit of the switch, the compressor will turn back on, and fill to the high limit. Looking at this, you can see that the larger tank will allow more time between compressor runs.
I know this is long but hopefully it gives you the info that you're looking for.