Theoretical air compressor question

[KlausVanWinkle]

I want to run 2 MV50 compressors to make tire fill ups faster, to have a back up and possibly to fill an air tank to enable air tools.

For filling up a tire, would it be faster to

A: Fill up 2 tires at once by hooking up a separate compressor to each tire.

or

B: Run both compressors in parallel to fill up one tire.

Theoretically, running two in parallel should double the CFM, which is what I want. I don't care about PSI.

 

[Jetboy]

Fill up 2 tires separately at the same time.

You won't double the air volume into one tire because of the restriction caused by the valve stem orifice. With two MV50's you might actually have pressure buildup issues since they don't have pressure switches. My York (I know it's more cfm) will cycle on and off at 90psi pressure switch because the air flow at that pressure through a valve stem is less than the compressor output.

 

[KlausVanWinkle]

Fill up 2 tires separately at the same time.

You won't double the air volume into one tire because of the restriction caused by the valve stem orifice. With two MV50's you might actually have pressure buildup issues since they don't have pressure switches. My York (I know it's more cfm) will cycle on and off at 90psi pressure switch because the air flow at that pressure through a valve stem is less than the compressor output.

Interesting. Thanks for the info. Couldn't I wire them with a pressure switch though? Where they both come on if tank pressure falls below 90psi?

 

[mudbludger]

Should be no problem to wire that up, a pressure sensor on your tank controlling a relay for each compressor would be enough for a simple setup

 

[KLF]

I have an MV50, and I think you are bring overly optimistic about a pair of them keeping up with any air tools. Remember they want 90 psi to run, and these compressors really don't operate well at those pressures. They will get VERY hot. No way you'd be able to keep up with someone with a ratchet wrench, at which point why bother.

 

[Tools R Us]

I have an MV50, and I think you are bring overly optimistic about a pair of them keeping up with any air tools. Remember they want 90 psi to run, and these compressors really don't operate well at those pressures. They will get VERY hot. No way you'd be able to keep up with someone with a ratchet wrench, at which point why bother.

X2, great air up compressors, not good at higher pressures. If you want more capacity, get a Puma.

 

[Jetboy]

FWIW - I have never once run an air tool off my York compressor either. I don't think you'll have any reason to do so. Trail repairs are so seldom that you can just use basic hand tools. Plus why carry all the extra weight of air tools? Even if you wanted electric power tools, you'd be better off to run them directly on 12v power. Buy some cheap Ryobi 18v or 12v tools, put an anderson style plug out the front, cut apart one of the batteries and make an extension cord to run the tool, and you'll have a lot more useable trail tool than what you'd get from the limited air pressure you have from your mv50s.

 

[KlausVanWinkle]

FWIW - I have never once run an air tool off my York compressor either. I don't think you'll have any reason to do so. Trail repairs are so seldom that you can just use basic hand tools. Plus why carry all the extra weight of air tools? Even if you wanted electric power tools, you'd be better off to run them directly on 12v power. Buy some cheap Ryobi 18v or 12v tools, put an anderson style plug out the front, cut apart one of the batteries and make an extension cord to run the tool, and you'll have a lot more useable trail tool than what you'd get from the limited air pressure you have from your mv50s.

I bring 18v tools with me sometimes. That probably is overly optimistic. Really I just want better inflation times. And an onboard compressor for air lockers but the ARBs usually come with a free compressor anyway.

Simplistic solution, buy a second mv50 and fill up 2 tires at once. Plus someone always seems to forget a compressor on our runs.

And it sounds like the valves have enough restriction that its take a significantly stronger compressor to also cut full up times in half.

 

[Tapage]

IMOP .. if you really wan't to improve the fill time I would said get a tank .. something like 3 gal will help a lot ..

 

[rusty_tlc]

FWIW - I have never once run an air tool off my York compressor either. I don't think you'll have any reason to do so. Trail repairs are so seldom that you can just use basic hand tools. .....

That's a broad statement.

I have never regretted having a few air tools even if just for tire changes. Count the number of fasteners involved in a birfield swap. If you would rather spend the time turning wrenches than sit by the fire drinking beer be my guest.

 

[Tools R Us]

IMOP .. if you really wan't to improve the fill time I would said get a tank .. something like 3 gal will help a lot ..

Adding a tank to a small compressor will increase air up time.

 

[Jetboy]

That's a broad statement.

I have never regretted having a few air tools even if just for tire changes. Count the number of fasteners involved in a birfield swap. If you would rather spend the time turning wrenches than sit by the fire drinking beer be my guest.

Air tools are definitely handy, I just don't think it's worth carrying them for the few times I'd use one. Mostly it's just the extra weight I'm trying to avoid, which makes little sense considering I have an 8274 with 150' of steel cable...

I tend to think a small 12 or 18v impact is probably the handiest tool for most repairs. It's the small nuts and bolts that take most of the time. In my garage now I use an 18v impact driver for something like that even with air available.

I believe a birfield can be changed with 18 threaded fasteners plus one snap ring. Or 12 threaded fasteners if you run w/o the outer snap ring.

 

[LandCruiserPhil]

Adding a tank to a small compressor will increase air up time.

This ^^^

PUMA has proven itself over time. Hands down the best value in plug-n-go 12V compressors today.

 

[Tapage]

Adding a tank to a small compressor will increase air up time.

This ^^^

PUMA has proven itself over time. Hands down the best value in plug-n-go 12V compressors today.

I have one .. and IMHO tank helps .. I've try the compressor alone and overall time seems to be more .. ( didn't take a scientific time data record )

 

[KlausVanWinkle]

I have one .. and IMHO tank helps .. I've try the compressor alone and overall time seems to be more .. ( didn't take a scientific time data record )

I wonder how much faster a puma would be. It takes up a lot more space though. I'd have to separate the compressor from the tanks.

 

[LandCruiserPhil]

I wonder how much faster a puma would be. It takes up a lot more space though. I'd have to separate the compressor from the tanks.

315 KM2's air from 14 - 36 in 2min 10 sec each at 1500' and below 100°. It will be slightly faster without the tank.

I purchased my PUMA back in '07 just after TOOL's and it has been the best Chinese tool ever purchased to date.

 

[KlausVanWinkle]

315 KM2's air from 14 - 36 in 2min 10 sec each at 1500' and below 100°. It will be slightly faster without the tank.

I purchased my PUMA back in '07 just after TOOL's and it has been the best Chinese tool ever purchased to date.

That's a little over twice as fast as it takes my mv50 to get my 295/75/16s from 20-45psi. Still makes me think that for $50, 2 mv50s is going to be the fastest per dollar way to fill up. Heck you could buy 4 for the price of a puma and fill all the tires at once in 5mins if your electrical system could take it.

 

[TLC76]

I recently bought 2 MV50's for this exact reason, $19 #4 amp hookup kit on ebay and you're up and running. Need to get a pressure switch and small tank though.

 

[LandCruiserPhil]

That's a little over twice as fast as it takes my mv50 to get my 295/75/16s from 20-45psi. Still makes me think that for $50, 2 mv50s is going to be the fastest per dollar way to fill up. Heck you could buy 4 for the price of a puma and fill all the tires at once in 5mins if your electrical system could take it.

I look forward to your test results.
Are you concern with the 50% duty cycle of the MV50?

 

[KlausVanWinkle]

I look forward to your test results.
Are you concern with the 50% duty cycle of the MV50?

No. I've used my current one to fill up 8 295/75/16s from 20 to 40ps in a rowi without issue.