Identifying Ingersoll Rand Compressor Models – Identifying Old Air Compressors

Published Categorized as Air Compressor Identification, Ingersoll Rand 12 Comments on Identifying Ingersoll Rand Compressor Models – Identifying Old Air Compressors

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Having an issue identifying an Ingersoll Rand air compressor model? This article will provide you with tips on how to identify an older air compressor in order to try to source parts, find a compressor manual, or just get some online guidance on proper use and so on.

This page will also provide an opportunity for readers to post photos of their old air compressors so that someone can help identify them!

Table of Contents

Tips on How to Identify Ingersoll Rand Compressor Model

Identifying an Ingersoll Rand compressor model can be done with the 4 following steps:

How to Identify Ingersoll Rand Compressor Model

  1. Check the backside of the tank

    Check the backside of the tank to see if there’s a stamp that lists the year that the compressor was produced along with the manufacturer. If only the manufacturer name is present, do a google search of the brand compressors.

  2. Look for patent number

    Look along all sides of the air compressor for a patent number, which is often listed near the name of the manufacturer on most older air compressors.

  3. Run a search on the patent number

    Go to google patents and run a search on the patent number (if you find it), this will provide you with basic information on the model including the manufacturer and issue date.

  4. Upload images of the compressor to a forum

    Upload images of the air compressor to a forum like this page where other compressor connoisseurs are likely to recognize the model.

For more detailed information, visit our Identifying An Older Air Compressor – Serial Numbers, Photos & Antique Air Compressor Identification guide here!

Reader Questions & Responses

Identifying Ingersoll Rand Compressor Model


Hello, I am trying to I.D. this old air compressor pump so I can match it to the proper air tank. Thank you

Oil Fill Side W/1 Ft Ruler
Oil Fill Side W/1 Ft Ruler
I.d. Plate
I.d. Plate
Back W/1 Ft Ruler
Back W/1 Ft Ruler
Top W/1 Ft Ruler
Top W/1 Ft Ruler


It’s got a motor? What’s the rating on that?

And the pulley size?

Looks like the sheave is around 9 inches – bore about two and stroke maybe three?

All that is in aid of guesstimating the flow to answer the tank question.

Good with the ruler though. Just kinda hard to see.


Its an IR model A from a 30-liter tank, 2 hp 930 rpm approx 4 cfm

Please leave a comment below if you’re able to help identify an Ingersoll Rand compressor, or if you have a question yourself, with photos if applicable, so that someone can help you!

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What size motor will this need? What rpm? What hp? How can I calculate the cfm?

Last edited 1 month ago by Ted Long

i have the same pump with the tank and motor,the guy i got it from bought it used in 1947.its an upright bottle type tank mounted on a lil cart.the airlines coming from pump circle around tank before feeding in .bottom of tank can be unmounted and inside is like steel wool in upper half.mine is still running.

It is definitely older than mine. I have one I can not completely identify. Just found a picture of a Ingersoll Rand 30P30 which has the same casting and filter plate design however mine has four cylinders and the 30P30 has two. It stopped building air last year so I had to cut my own gaskets for one of the heads. It keeps on pumping though.

I have a Model A, (no other defining marks on the compressor body). its connected to a 62l upright tank and is ran from a single phase 240v electric motor. i aquired it from a family friend after they downsized their property, here in the UK. It has recently started to weep oil from around the fill plug and the crankshaft seal. i am looking to find a rebuild kit for it (but have resided to the fact i may have to source seals and make my own gaskets)… i am also unsure of what oil i should use on… Read more »

If you’re tearing it down, you may want to go with a full synthetic. 20 or 30 depending on the rings/bore.

Hi Doug, Thanks for the reply. Compression doesnt seem too bad, it fills to around 120PSI in approximately 5-10 mins. (ive never measured either accurately) it sucks pretty hard if you place a gloved hand over the intake. it also doesnt seem to be losing compression past the rings. ive had it running with the fill bung out and didnt note any ‘excessive’ pressurisation of the crankcase or loss of oil out of the fill hole. i know its around 40 years old (motor is stamped 1976 and seems to be original) i did note that the oil level is… Read more »

Yeah, stuff that much predates 1995 or so is fairly rare except for collector type stuff. There are some parts that fit, though. Look at sites for i-r parts, and if you drill down you can find gasket sets and stuff. I didn’t notice any seals, but I wasn’t really looking. They may even have parts books, but I’ve never asked, not having a legit reason…
Good luck!

hello i am needing a bit of help finding specs for my ingersoll rand air compressor pump so that i know how big of a tank i can put it on and not over work it

Can you post some pix of the whole pump please?

1934 bench wire brush wheel (enjoy) just above the model number you can just see the date 1/1/34 very similar motor to whats on my comoressor Model 2. Cheers Doug

Hi ive just bought this Ingersoll-Rand compressor. Its a stainless tank with wormald company engraved in it. I assume a after market tank? The motor looks re built by paint work. Its a General Electric and says 3/4 HP on motor(pics attached). ID Plate on comp itself says Model No. 2 Serial No. 02157 (engraved but a 1 printed before this number and a B Printed after it) and Max Pressure 862kpa(pics attached) any idea of its rareness, age or price or what it was built for would be much appreciated. Thanks

It’s probably unique. The motor may have been rebuilt if it wasn’t maintained as specified on the label. But it was almost certainly purpose-built. For what, I have no idea. If it were anything recently built it would have a belt guard. I don’t see a pressure switch – is there one somewhere not shown in the pix? That connector at the tank is male – another mystery. You normally expect that to be female. You may be able to get parts for the pump, but it’l probably take some sleuthing. The model 2 is **wayyyy** out of production. Doug… Read more »