7.5HP/23CFM Air Compressor Build

www.howtomotorcyclerepair.com/
Learn How-To Repair and Maintain your own Motorcycle!
Support me on Patreon.
/ matthewmcrepair
Buy me a beer
www.howtomotorcyclerepair.com...
Now on Facebook. Give me a Like.
/ howtomotorcyclerepair
Sign up for my newsletter! Get emailed when new videos come out.
www.howtomotorcyclerepair.com...

[@tbirdboy]

Craigslist did me right! Picked up a Speedaire 7.5hp/80 gal for $1000. Old man was moving and had a full fledged work shop in the back of his property. I tried to work him down but he held his ground. Got it on my truck, had my electrician install a 240 breaker and NEMA outlet, started blasting everything I could and I am happy. It is truly a monster, loud but a monster.

[@HTMR]

Nice! Add a muffler on the intake to make it quieter: kzbin.info/www/bejne/pKfTlI17h69qps0

[@tbirdboy]

@@HTMR Sounds like a good idea. It is kinda loud.

[@ericl5973]

Nice setup. I would recommend adding a moisture filter with an auto drain after the aftercooler to keep the tank dry. I added an aftercooler and 2 filters with auto drain before the tank and my tank practically never gets water in it and the air is nice and dry.

[@HTMR]

The unit has an auto tank drain that goes off every time the pump shuts down. The receiver is actually a really good at condensing water, since it has a lot of thermal mass.

[@rksg2003]

He will have very little if any condensation with that after cooler..

[@kmcwhq]

Compressor oil always looks clean because it's non-detergent. All the dirt settles to the bottom of the crank case. Best to change it once a year no matter what. Nice unit.

[@0ooooooooa]

Another useful video. Thank you Matthew!

[@Alabamaweldinginspector]

That was a great deal on the compressor ! I have bought and sold many over the years and Champion is a very good compressor. You will get many years of service out of that machine just do the maintenance and they last forever . My last purchase was a Saylor Beall 9000 on a 200 gallon tank that was in excellent condition I got from a surplus company for $1,299 . It has a 15 hp Baldor motor so I run it off of a rotary phase converter . It will fill up the tank to 175 psi in 4 1/2 minutes ! If you have the spare parts to sell let me know . Pedal down 😀

[@PaulThomas-qo9vy]

Nice very cool Champion you have there Matt! Paul

[@davidlesley8884]

Fairly quiet too! Nice job! I need one of those compressors

[@HTMR]

I would say it is quieter than my 5hp. I also put a solberg silencer on it and even quieter now!

[@tom18181]

Man im glad you kept it

[@michaelhoersch6626]

Is that new motor compressor duty rated? Compressors are very hard on electric motors and will eventually burn out a standard motor due to insulation failure. Compressor duty rated motors have higher rated insulation that can handle the excessive heat. I worked for a motor manufacturer for almost 40 years ad we saw a lot of motor failures with people that used a standard motor to run a compressor. These warranty claims would be rejected.

[@HTMR]

Yes motor is rated for this application.

[@TF856]

You could just build a phase adaptor. We used to have a neighbor in a residential area that had a garage full of three-phase machinist equipment and used a phase adapter to run all his machenery. It may have been modified 3 phase. He used a small electric motor to do it.

[@HTMR]

I want to increase the HP, so a new motor was needed and easier to go with single phase.

[@91rss]

shop we know took the air filter off, and shoved a clear tube over a pipe nipple screwed in its place, and the hose went down into one of those come air filters, It took literally 90% of the noise from the sucking away. you can stand beside the compressor and talk on your phone now

[@watcher15565]

Hi again. I have a question about media and water proporsions. If i have 45liter tank of water, how much glass beads should i add? 10%15%?😄 Thanks!

[@lloydscharf6897]

I consider my self somewhat a MacGyver. Single phase/3phase Roto-phase converters are available but quite expensive. I've seen some infromation on the newer 3phase inverters and I believe they make the extra two phases with the amps required being out of phase with the primary. so the demand is less. Finaly if the government is going to mandate electric home heating and electric cars the power companies are going to haveto upgrade all their lines to supply power where they now are getting along just with single phase, so running 3phase to our homes should become more reasonable. you may want to hang on to that 5Hp 3phase moter for a future project LL&P

[@MrHowieZ1973]

Did you get the right size pulley for that compressor? Seems a little fast for a Champion pump

[@HTMR]

I found the pulley size and pump RPM for 7.5hp in some champion documentation.

[@joesabal1212]

Nice build, how did u determine the motor pulley size? I thought that compressor heads were rated for certain RPM maximums, therefore the need to calculate the pulley sizes to get the most out of the compressor without red-lining it.

[@HTMR]

This pump is used in both 5&7.5hp units, just different RPM. Champion had docs on motor pulley size and RPM for all models.

[@IanGSully]

Well, as far as the motor. Instead of buying a single phase motor, you could also have bought a VFD with a single phase input which will then put it to 3 phase for the motor. That was just an idea. But some things that you have to know about sizing the VFD is you have to get one that will withstand the amp draw and the rated 5 HP motor.

[@HTMR]

The goal was to spin the pump faster with a bigger motor and get more CFM. VFD won't do that.

[@johnversluis3084]

Wow you got a great deal on the unit !! Did you use the same pulley from the old motor ? The dia will determine the speed of the air pumps ? what is the pump rpms running now ?

[@HTMR]

New pulley. 5hp rpm - 740.........7.5hp rpm - 950

[@jacquespoirier9071]

it is a very good practice to keep the pump RPM as low as possible, 1100 RPM is a good limit, after that, oil pumping often arises spoiling your tank and your air lines.

[@johnversluis3084]

To have a 50 amp circuit hire an electrician near you that is certified and bight the bullet run a complete new circuit do it right so you don't burn down the garage and house

[@watcher15565]

Hy there!First of all, thanks for all great content! So i am choosing between two specs of air compressors. One is 26cfm/71gallons 5.5kw and other is 39cfm/132gallons. 7.5kw Can you help me to decide wich one to buy specific for Vapor blasting. is it worth of spending two grand on a 7.5kw monster with 39cfm or its just waist of money cuz 5.5kw with 26cfm can do a great job? money diference is around 500 euros. Thanks for answer! best regards!:)

[@HTMR]

Go for more air given the difference in price. You can run a bigger gun and blast faster, or choose to give compressor a break LOL

[@watcher15565]

@@HTMR Thanks a lot, again :)

[@MrVozka]

I got mine for 500 but don’t know if it works might have to swap motor for single face

[@jjsteen99]

Great video! Hit up Castair for an auto drain or any parts and troubleshooting.

[@HTMR]

This unit already has an auto drain and it still functions great. Thanks for the link I will check it out.

[@PaulThomas-qo9vy]

Another great source for anything related to domestic (USA) heavy duty industrial air compressors is fellow KZbinr THE Compressor Guru, Bud Stiner, in Pennsylvania. His 40+ years of experience & great DIY tutorials & warehouse of parts, inc. real aftercoolers! Check him out! Tell Bud that Paul from S. Central Tx sent you! Cheers.

[@halfstep67]

The price of wire has gone down a little. Buying extension cords will be expensive. You might want to buy some wire and make your own temporary cord until you can make other modifications.

[@HTMR]

I priced out wire vs. extensions cords and price was about the same. I bought ex cords for now and will be able to sell them later. I don't know if I will be putting a sub panel or simply a single 50A outlet in garage, however it is a project for a later time.

[@CajunGreenMan]

How did you know the compressor would handle the 7 HP motor? I'm guessing the tank lists the max safe CFM. Keep up the great work!

[@outerfroggy1]

The pressure switch would cut out the electric motor at a set PSI (usually around 120-130). The only consideration would be the RPM which can be adjusted with pulley sizes. You could plop a 25hp industrial beast motor on that thing and the compressor pump wouldn't care.

[@HTMR]

The champion pump documentation has the RPM/CFM/pulley specs for both 5hp and 7.5hp. Tanks usually have a max psi rating, cfm does not matter.

[@CajunGreenMan]

@@HTMR I asked my question badly. I was really trying to get at the RPMs of the pump which I assumed increased with a larger HP motor. But you answered it, the documentation includes specs for the higher HP motor. That was definitely a great deal!

[@mrbmp09]

Would it have been cheaper to use a vfd on the 3 ph. motor?

[@HTMR]

I wanted 7.5hp and more cfm. Already had a 5hp unit in the shop and was looking for more air.

[@w.ryanemch1351]

question I have is can you raise the cfm of a normal stock 5hp 80gal compressor. Like if you change the pulleys?

[@HTMR]

You can....however the motor is going to pull more current and may be operating out of its intended range. I don't think it is a good idea. You can put an amp clamp on it and see what it pulls right before cut out psi and compare to name plate FLA.

[@w.ryanemch1351]

@@HTMR thanks

[@robert5]

I'd like to find a compressor pump like that and make a pto driven compressor and hook it to my 23hp tractor.

[@assyholey4224]

like the way you use hot air to cool it. next box it in like put it in a closet.

[@tigwelding123]

💪👍💯

[@bigdfig6083]

Thanks for this vid. Good job on scoring such a deal. Too bad all the haters chiming in eh, mama's boy? LMFAO

[@HTMR]

Yeah I thought that was funny.

[@bobsanders5488]

What auction site did you use to buy the compressor?!

[@HTMR]

ebay

[@1stMrSoundguy]

you could hook it in dual tank config.

[@HTMR]

I could but 80 gal is more than enough.

[@daubendiek]

faster pump, shorter life

[@mudnducs]

How did you size the new pulley?

[@HTMR]

Based off champion 7.5hp pump rpm specs.

[@MegaDrfc]

Hello do you still have your old magnetic switch? If so would you sell it?

[@HTMR]

Got tossed when I moved. no one wanted it at the time.

[@MegaDrfc]

Okay thank you

[@assyholey4224]

@@MegaDrfc he could have used it but was not able to google 3phase to 1phase. but he said I scored 13 times. Didn't score on the starter. even after looking at the new one with the jumper wire in, it.

[@terryzak1742]

What a huge score on that compressor!! Why didn't you just wire the low oil level and the pressure switch in "series" to each other?

[@terryzak1742]

How did you make out with the voltage drop from the extension cords? Did you add a 100-amp subfeed to your shop yet?

[@HTMR]

I guess I could have done it that way also. The way I wired it was how I received it.

[@HTMR]

@@terryzak1742 I moved and yes installed a 50a outlet: kzbin.info/www/bejne/Y3aomHitq5mMr80

[@lomsomesGarage]

I need the number for who sales champion air compressor’s i need the reed valve and seal’s for mine

[@yohanespurwanto2755]

always arrange unloader selenoid valve , so motor start without load for a while.

[@HTMR]

It has a mechanical unloader.

[@ToxicityAssured]

Why did an air compressor used in Home Depot's back room have a rigged up aftercooler? The price, compressor and background story leave my imagination hard at work... there is more to the story.

[@peterpann9619]

Any idea why an air compressor builds excess crankcase pressure?

[@HTMR]

Tell me more about your problem. Or is it just an observation when oil filler cap is off?

[@peterpann9619]

@@HTMR fixed it was the check valve

[@TF856]

A ton of air? How do you figure that when a ton is 2000 lb.

[@HTMR]

It's called a figure of speech

[@frazalive]

Just so you know, running the compression block on a higher rpm will lead to higher temps and greater wear and tear. The higher cfm requires different cylinders and piston arrangements. P.S. I design and manufacture compressors for a living.

[@HTMR]

I understand that. However, this pump is sold in both 5hp and 7.5hp configs. The difference is motor size and pump RPM. Here are the links: 5hp: www.tptools.com/Champion-5HP-2-Stage-80-Gal-Air-Compressor,9446.html?b=s*champion+5hp 7.5hp: www.tptools.com/Champion-75HP-2-Stage-80-Gal-Air-Compressor,9444.html?b=s*champion+5hp

[@frazalive]

@@HTMR Seems more like a case of false advertising wherein they used the same stock image. If you read the description, no specific information is provided about the cylinder or piston sizes. You can see how both the motors look identical as well. Sometimes companies can be lazy in taking professional photos of their products (I’m also guilty of the same). That said, it does mention running at a higher rpm. Could be a cost-cutting measure. The compressors that we manufacture have a whole separate block when we go to a higher cfm and motor rating. We do not run the block at a higher rpm cause it’ll just speed up the wear and tear. And since we engage in mostly B2B aimed at industries, we cannot afford such a blow to our reputation.

[@HTMR]

@@frazalive It is the SAME pump. They have been building them this way for 50+ years. Champion is an excellent brand. When you go to 10hp then it is a bigger pump.

[@frazalive]

@@HTMR I’m not saying it wouldn’t work in a residential or workshop setting. It just wouldn’t work for my customers who rely heavily on the compressors and for extended periods of time. In our 10HP setup we have a three cylinder system with also an aftercooler and add-on features. Just pointed out there’s a consequence associated with raising the cfm with just changing the rpm.

[@HTMR]

@@frazalive I understand completely. This is the best option for me right now though w/o spending $3k+.

[@jaytodd6317]

Why not run it with a VFD and keep the 3 phase motor

[@HTMR]

Because I already had a 5hp compressor. Wanted to go 7.5hp and get more CFM.

[@bustamantealdo]

Why can’t I ever get deals like this..

[@HTMR]

It took me 7 years to find it LOL

[@vettepicking]

Add casters to that false wall....

[@HTMR]

It has feet with plastic slides, moves really easily.

[@davideldridge2537]

VFD

[@HTMR]

I wanted 7.5hp. Already had 5hp.

[@jacquespoirier9071]

all your compressor is OK, the enclosure is really not OK, running a compressor is very like directly heating the appartment where it is located so on a long running time, the interior of the enclosude will become so hot that your aftercooler will become ineffective and of course the water separation will become ineffective.

[@jesusa.espino6408]

Most be good to have extra money at 25yrs of age mamas boy😎

[@HTMR]

I'm 41, married, 4 kids...but thanks for the compliment....guess I look young. 🤣

[@MarkK01]

That's weird that you paid the owner directly from a Ebay sale. Normally you have to pay for the item through Ebay. Does not make sense that you scored this for only $145.00 and you paid the owner directly. Sounds like a fishy tale.

[@HTMR]

You can accept cash as a seller and "mark as paid" in your dashboard. I have done it several times with local heavy items.

[@bigfoottoo2841]

Probably stolen

[@HTMR]

Yeah so easy to steal a 600lb compressor.

[@montanasoftware5954]

@@HTMR LOL ... Yeah, and then make a KZbin video about a stolen compressor! Some people will say anything online.

[@Breezer56]

So let me get this right? You spend $600 on a new 7.5 hp motor and $200 on a mag-starter. Now you won't spend a little more for a small electrical box and wire togo to your basement, but you will buy more welding cord to go to the basement? Come on and pony up and never worry about this again. Who wants to have cords running to the basement and have to screw around with connections and crap, especially when you will need it right away for an issue.....

[@HTMR]

The electrical cord was just to test it. I have a subpanel in the garage, and a 50A outlet where the current 5hp compressor lives. I have since moved and ran 50a in the new house: kzbin.info/www/bejne/Y3aomHitq5mMr80

[@assyholey4224]

you can use 3phase starter on 1stage electric supply. try to get your act together before you make a video. champions are great compressors.

[@HTMR]

I already have a 5hp unit prior to buying this one. I wanted 7.5hp and more CFM.

[@LifesAbe-ach]

Utter bollox ... more rpm , more heat , more moisture .

[@rpsmith]

Three Ways To Run A Three Phase Motor On Single Phase: kzbin.info/www/bejne/mXaWZYx-qLeMbpo Almost always way better and cheaper than buying a new single phase motor.

[@HTMR]

But I wanted 7.5hp, not 3 phase 5hp.

[@rpsmith]

@@HTMR -- My post was meant for viewers needing to run a 3 phase motor off a single phase circuit, not specifically for your requirements.