Quote: Originally posted by pacificobob | The one specification missing from many underperforming compressors
Is CFM@ a given psi. Eg: 60psi. 90psi. [/rquote]
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The industry standard is to measure an quote the cfm at free flow.
CFM at a given pressure is meaningless unless the volume the flow is pushing into is defined. Some do it by specifying a tire size.
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It would be great if the Nomads with various compressors also posted the actual time it takes to inflate their tires in real time.
With 16" truck tires (Tacoma, etc.)...
I measured the Coleman brand pump that plugs into a cigarette lighter: 2 psi per minute.
The next two, clip directly to the battery terminals:
Harbor Freight pump: 6 psi per minute (but melted fuse holder)
MV-50: 5 psi per minute.
For sand, I lower to an average of 15 psi (12-18) based on tire type, sand type, and the humidity. My current tires' street pressure is 34 psi.
3-ply sidewall tires need to go to 10 psi to float where 'cheaper' tires only need to drop to 15-18 psi.
To go from 15 psi to 34 psi (19psi added):
Harbor freight: just over 3 minutes per tire
MV-50: almost 4 minutes per tire
Coleman cig. lighter: almost 10 minutes per tire |