Value of this air compressor

[JB740i]

I saw there is gonna be a big auction this weekend and noticed this compressor on their website. Can anyone ID it and would it have anything (CFM) over my standard 33 gal upright craftsman?

http://www.dudleysauction.com/1-12%20Onsite%20Auction/DSC_4693.JPG

[goodfellow]

Without clear markings, I'm only basing my answers by looking at the style of the unit -- it does have a standard single stage, two piston pump. Maybe 1970's vintage Speedaire (or Sears) 20 Gal. model (both were usually green in color and Speedaire did supply Sears for years). The motor should tell you the HP rating. If it's 2-3HP, and 220volt, then it's rated for about 7.0 CFM at 40psi and 6.0 CFM at 90psi. Sears also sold a 4HP 20 Gal. model in those days that was rated around 8.2 CFM at 40psi and 7.0 CFM at 90psi.

Actually, I looked at the pic one more time, and it looks like a stationary unit that soemone converted for mobile use (notice the home made risers on the front legs). If it's a stationary unit, it will likely be a 28 or 30 gallon tank.

Not much of a performance improvement over your current 33 gal unit; except that it's a lot quieter and definitely better quality :thumbup:



It's worth about $75.00, assuming everything is working and in decent shape -- especially the condition of the tank.

[Uncle Buck]

Possibly an old Dayton Speedair unit from Grainger? As to an improvement.......If your 33 gallon is a direct drive setup almost any old compressor that is not a direct drive would be a quality/longer life improvement, but I cannot speak to specs.

[MXtras]

I agree with the $75 guestimate.

Scott

[Uncle Buck]

I agree with the $75 guestimate.

Scott

Yup, me too! :thumbup:

[Franz©]

What you kids callin old?
That's a 1960s pattern Quincy.
The tank is a time bomb waiting to explode, and I wouldn't be surprized to find JB weld along the bottom seam.
Tank and compressor are original, beyond that the rest looks replaced by a shoe cobbler.
Value- if you're suicidal - less than $50- if you really need to motor. The jug is rebuildable, but the cylinders will probably need to be bored, or at least honed, and I wouldn't be shocked if the connecting rod is whipped. Without inspecting the tank I wouldn't power that thing. I've seen one blow!

[JB740i]

The house it's in was appraised at 1.2 million and is up for sale due to threatening forclosure. Guess they weren't spending their money on air tools. Okay, thanks for all the info. I'll pass.

[Uncle Buck]

What you kids callin old?
That's a 1960s pattern Quincy.
The tank is a time bomb waiting to explode, and I wouldn't be surprized to find JB weld along the bottom seam.
Tank and compressor are original, beyond that the rest looks replaced by a shoe cobbler.
Value- if you're suicidal - less than $50- if you really need to motor. The jug is rebuildable, but the cylinders will probably need to be bored, or at least honed, and I wouldn't be shocked if the connecting rod is whipped. Without inspecting the tank I wouldn't power that thing. I've seen one blow!


One thing is for sure! No one will ever accuse you of being one bit pessimistic! :lol_hitti

[Franz©]

You ever seen one of those tanks that opened up under pressure Buck?

The last one I came across let go along the bottom seam where some GEENIUS had used JB weld to keep it going.
The side of the tank hit the flywheel hard enough to bend the crankshaft sufficiently for the pully to make contact with the jug.

I have one in the barn that's near a twin to that machine, and it sits there for no purpose other than airing up tires. The draincock is always open, and if I don't hear air and close the draincock when it starts I pull the plug. The receivers on those machines weren't built with a rust tolerence. They barely passed ASME specs the day they left the factory. I've seen a few that the owners didn't drain. The receiver will hold a hell of a lot of water, and the machine will run with the receiver 90% full of water. It just short cycles a lot.


You can imply that's a pessimistic viewpoint, but I've been around enough pressure vessels to know a pessimistic attitude just might keep me or somebody else alive.

[goodfellow]

That's the problem with old compressors. The tanks are usually the weak link. Back in 1982, there was a trim shop next to my place of business. We were separated by a cinder block wall. One afternoon their early 1960's vintage 60 gal vertical two stage exploded. It blew out the entire bottom and half of the vertical weld seam was split open. It knocked down a large portion of the block wall, and had it not been for my old MAC toolbox, a piece of the copper tubing would have wound up as shrapnel in me.

The insurance investigator reported that the tank was severly compromised by rust and corrosion.

Can't be too careful with old pressure vessels. Since that incident, I'm pretty anal about draining and inspecting my units.