7.5HP/23CFM Air Compressor Build 

Nice! Add a muffler on the intake to make it quieter: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nvpcZERJ7pk.html

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

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.

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

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

Yes motor is rated for this application.

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.

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

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

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

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.

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

Another great source for anything related to domestic (USA) heavy duty industrial air compressors is fellow RU-vidr 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.

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

@@HTMR Thanks a lot, again :)

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

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

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.

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.

@@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!

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.

@@HTMR thanks

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.

It has a mechanical unloader.

I could but 80 gal is more than enough.

ebay

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

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

@@terryzak1742 I moved and yes installed a 50a outlet: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--EEgEwv4Yyk.html

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

Okay thank you

@@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.

Based off champion 7.5hp pump rpm specs.

Yeah I thought that was funny.

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

@@HTMR fixed it was the check valve

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

@@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.

@@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.

@@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.

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

It's called a figure of speech

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

It took me 7 years to find it LOL

It has feet with plastic slides, moves really easily.

I wanted 7.5hp. Already had 5hp.

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

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

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: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--EEgEwv4Yyk.html

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

Yeah so easy to steal a 600lb compressor.

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

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

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