With Walker I hope they were talking about a Centrifugal filter. I look at mine was explained the concept yes I think I understand by looking at the way it should work and believe oversized is not the way to go. Will the setup hurt no will most water be dropped in the filter yes the amount of water in the tank downstream of the filter will be the truth No water it worked little water or a good amount is it as efficient as it can be.Just wanted to share a little info I got as I was worrying about over sizing it and actually thinking about getting the 1/4” NPT rated at 25 CFM since it was even closer to the 24 CFM rating of my compressor.
First I called Tyler at Moisture Boss, super helpful. I talked to him about getting a filter that closely matches the output and he did indeed say that if the filter is too over sized from the output of the compressor that the filter will indeed not be as efficient at removing the water. He wasn’t entirely sure how less efficient it would be just that it would be.
I was hoping to figure that out since I’m undiagnosed OCD lol. I called Walker Filtration and they got me to the distribution manager. I asked these same questions and he was under the impression that it was actually the other way around, but appreciated the question and wanted to get an answer himself. He said he was going to go talk to the engineering team and have me talk with them. They called back and this is what I was told. The oversized filter will actually be more efficient and remove more water than one that is rated near the output of the compressor. So I told them I had 3/4” pipe and fittings coming from the inter cooler and they said it would be even worse if I were to step down in size using reducers, make the filter even less efficient. If they made a 50 CFM rated filter with 3/4” NPT, it would be great still, but the one rated for 125 CFM would do even better even though there is only 24 CFM going through it.
They said if I bought one rated for 250 CFM and hooked it up to a compressor that only offered 2-3 CFM then that is when you start losing efficiency, when you’re talking 24 CFM then you don’t have to worry about losing efficiency.
Who knows, they could have been trying to sell me the more expensive model, but I don’t think that is the case. Hopefully I relayed that info in a way easily understood.
So basically if you have a decent compressor that’s bigger than a pancake you’ll get better performance from a filter that highly overrated and whose fittings match that of the pipe, not requiring reducers.