Foretravel Motorhome Forums => Foretravel Tech Talk => Topic started by: kevo0000 on January 27, 2021, 07:51:05 am
Title: Portable air compressor
Post by: kevo0000 on January 27, 2021, 07:51:05 am
Hya all, has anyone got an idea of what would be the best portable 12 volt air compressor, that would be man enough to get my tyres up to maximum of 120 psi, I have Michelin tyres on front but they run at 95psi, which is not a problem, cause I have a small compressor that goes up to 115 psi, it takes me a while but I get there in the end, on the rear I have Dunlop which require 120psi, so in an emergency if I had a flat and had to repair puncture, I could get them up to about 110psi, which would be enough to get me to a garage to put the remainder of the air I need, I've seen so many portable 12 volt compressors on ebay and amazon which say that they will do truck tyres but they seem a bit to cheap, and they tell you that it takes 1 and a half minutes to go from flat to 30 psi, but they don't tell you how long it takes to go from say 100 psi to 120 psi, if I buy a 150psi portable compressor, does anyone have any good knowledge on this matter and what would be the most reliable and efficient make of compressor to do this job, I know I need a compressor that would put out continuous pressure of at least 150psi or maybe more, any suggestions would be appreciated, thanks kev
[fixed typo in topic title - Michelle]
Title: Re: Portable air commpreser
Post by: bpal on January 27, 2021, 09:17:44 am
I have this model. I have certainly used it up to 110 but you can see the detailed specs up to 130 and 150. 400P-RV Automatic Compressor | VIAIR (http://www.viaircorp.com/portables/400p-rv-auto)
Title: Re: Portable air commpreser
Post by: Roger & Susan in Home2 on January 27, 2021, 09:18:38 am
Look at this one, several on the Forum have one. Amazon.com: ARB CKMTA12 '12V' On-Board Twin High Performance Air Compressor:... (https://www.amazon.com/ARB-CKMTA12-Board-Performance-Compressor/dp/B0050DI9YQ/ref=psdc_155346011_t1_B07FMJ37NP)
I have a DeWalt 200 psi compressor (150 psi regulated max output) in my coach. 120v Amazon.com: DEWALT Air Compressor for Trim, 200-PSI Max, Quiet Operation... (https://www.amazon.com/DEWALT-DWFP55130-Heavy-Quiet-Compressor/dp/B00HQYFZGM/ref=sr_1_23?dchild=1&keywords=Dewalt+200+psi+compressor&qid=1611756743&s=automotive&sr=1-23-catcorr)
Title: Re: Portable air commpreser
Post by: Old Hippie on January 27, 2021, 11:06:24 am
Hi, another option....... I carry a CO2 tank in my Jeep to air up tires after I lower the tire pressure for beach / sand running. I can air up the coach tires very fast if they are low. the Old Hippie
Title: Re: Portable air commpreser
Post by: Pierce & Gaylie Stewart on January 27, 2021, 11:35:55 am
I carried a contractor's compressor that worked well but I needed the generator running to power it and it would wake the dead when operating. I replaced it with a couple of Senco compressors used with air staplers. They are not noisy and our inverters run them easily. Down side is low CFM and limited to 110 psi. I carry a tank to fill before using an impact, etc. I found mine on CL and F. Marketplace for about $40.
Another good compressor with higher PSI. Amazon.com: BOSTITCH Pancake Air Compressor, Oil-Free, 6 Gallon, 150 PSI... (https://www.amazon.com/Bostitch-BTFP02012-Gallon-Oil-Free-Compressor/dp/B00UHNM1R0/ref=sr_1_10?dchild=1&keywords=senco+compressor&qid=1611765037&sr=8-10) but you would need a big inverter to start these.
Good to listen to the compressors in operation for noise level before buying.
Pierce
Title: Re: Portable air commpreser
Post by: kevo0000 on January 27, 2021, 12:16:31 pm
I have this model. I have certainly used it up to 110 but you can see the detailed specs up to 130 and 150. 400P-RV Automatic Compressor | VIAIR (http://www.viaircorp.com/portables/400p-rv-auto)
Thanks alot
Title: Re: Portable air commpreser
Post by: Pierce & Gaylie Stewart on January 27, 2021, 12:32:16 pm
My problem with the VIAIR 400 is the price and the fact that they have rebadged an inexpensive compressor to sell to the RV crowd. If you notice the specs, it has a 33 percent duty cycle so after using for 5 minutes, you have to let it rest for ten minutes. How about this compressor: HEAVY DUTY 12V Portable Car Air Compressor Tyre Auto Tire Inflator Pump... (https://www.ebay.com/itm/HEAVY-DUTY-12V-Portable-Car-Air-Compressor-Tyre-Auto-Tire-Inflator-Pump-150PSI/223540489980?hash=item340c0d2efc:g:PjQAAOSw6XBc9kMu) All come from you know where. Just look up 12V compressor on ebay with 150 psi in the search.
If you use a 12V compressor, use the battery clips instead of going through the lighter plug.
Pierce
Title: Re: Portable air commpreser
Post by: Chuck & Jeannie on January 27, 2021, 01:10:04 pm
I have no irons in this fire, but casually glancing at the specs for the two 12 volt compressors mentioned in above posts (ARB and VIAIR), the ARB would seem more suited to the job of airing up BIG tires, especially if starting from zero (as in mounting a new tire).
The ARB has three times the CFM flow rate at the pressures commonly encountered with our motorhome tires, plus 100% duty cycle. In addition, you get the redundancy of a dual compressor design. If one side fails, you still have the other side (at half the CFM, of course).
Don (Don & Tys) has some experience with the ARB. He may chime in.
Title: Re: Portable air commpreser
Post by: kevo0000 on January 27, 2021, 01:19:17 pm
My problem with the VIAIR 400 is the price and the fact that they have rebadged an inexpensive compressor to sell to the RV crowd. If you notice the specs, it has a 33 percent duty cycle so after using for 5 minutes, you have to let it rest for ten minutes. How about this compressor: HEAVY DUTY 12V Portable Car Air Compressor Tyre Auto Tire Inflator Pump... (https://www.ebay.com/itm/HEAVY-DUTY-12V-Portable-Car-Air-Compressor-Tyre-Auto-Tire-Inflator-Pump-150PSI/223540489980?hash=item340c0d2efc:g:PjQAAOSw6XBc9kMu) All come from you know where. Just look up 12V compressor on ebay with 150 psi in the search.
If you use a 12V compressor, use the battery clips instead of going through the lighter plug.
Pierce
Hya pierce, thanks for that info, just looked at the one you just showed me on ebay, but im always a bit dubious when I see the price, it just seems to be too cheap but then sometimes a cheap one can be as good as a really expensive one, I've been looking on and off all day, there are so many on the market, I'm in 2 minds which is better, at the moment I have a dewalt mains operated 120 psi with a small tank but it actually cuts out at 115 psi and the problem I find is that I will fill the tank to115 psi and get some air in tyre but as the pressure drops I have to stop and wait for the tank to fill up again, it's fine with the front tyres cause they only take 95psi but it works, but obviously il need 150psi minimum, but do you think I am better off getting a mains compressor with a reasonable size tank as opposed to a 12volt, because all of the 12volt compressors seem to have such tiny little tanks and the last thing I want is to buy something that even though it will get me 120psi, I don't want it to take like hrs to do so, I've seen a few on ebay that say they are good for heavy trucks, and in the specifications it will tell you that it takes 2 or 3 minutes to go from flat to 30 psi but when I contact them and ask them how long it will take to pump my tyres to 120 psi, I just get a reply saying that they do not know, I know its all about cfm as well as psi, so I will look at a few that some of the other members have put up, thanks alot kev
Title: Re: Portable air commpreser
Post by: Pierce & Gaylie Stewart on January 27, 2021, 01:20:14 pm
I have no irons in this fire, but casually glancing at the specs for the two 12 volt compressors mentioned in above posts (ARB and VIAIR), the ARB would seem more suited to the job of airing up BIG tires, especially if starting from zero (as in mounting a new tire). The ARB has three times the CFM flow rate at the pressures commonly encountered with our motorhome tires, plus 100% duty cycle. In addition, you get the redundancy of a dual compressor design. If one side fails, you still have the other side (at half the CFM, of course). Don (Don & Tys) has some experience with the ARB. He may chime in.
That's more like it. And remember, the 33% is at about 90 psi not 150 psi where the load on the compressor is much greater so the duty cycle is shorter.
When you order from an Asian (or any plant) and make a sizable order, you get to put any brand name sticker you want on the product when it's just the garden variety product they manufacture.
So, find the product on Amazon, read all the reviews discarding "house" reviews and then make your decision.
Pierce
Title: Re: Portable air commpreser
Post by: kevo0000 on January 27, 2021, 01:36:14 pm
That's more like it. And remember, the 33% is at about 90 psi not 150 psi where the load on the compressor is much greater so the duty cycle is shorter.
When you order from an Asian (or any plant) and make a sizable order, you get to put any brand name sticker you want on the product when it's just the garden variety product they manufacture.
So, find the product on Amazon, read all the reviews discarding "house" reviews and then make your decision.
Pierce
Yeah I know what you mean about branded and unbranded goods, that's why I normally go for a well known brand name like de Walt, bosche, draper etc, in your opinion then, what would be a reasonable cfm to look for on a 150 psi compressor, also I've never been one to trust reviews either because anyone from a company could put up several good reviews and I never ever trust what I see on the Internet,, that's why I like to come on this forum and listen to real genuine people then I can look at some of the recommendations they have given me thanks kev
Title: Re: Portable air commpreser
Post by: Journey, Roam, Explore on January 27, 2021, 01:51:19 pm
I have no irons in this fire, but casually glancing at the specs for the two 12 volt compressors mentioned in above posts (ARB and VIAIR), the ARB would seem more suited to the job of airing up BIG tires, especially if starting from zero (as in mounting a new tire).
The ARB has three times the CFM flow rate at the pressures commonly encountered with our motorhome tires, plus 100% duty cycle. In addition, you get the redundancy of a dual compressor design. If one side fails, you still have the other side (at half the CFM, of course).
Don (Don & Tys) has some experience with the ARB. He may chime in.
Agreed. I have the Viar model for RVs that was transferred with the coach from the previous owner. Well I've been able to use a successfully with a external small air tank added the ARB would be a much better unit in my opinion. The Viar just does not have the quality in my opinion. I dropped one side of one of the tubings and found that it was plastic inside it broke I had to buy a whole new tubing.
Title: Re: Portable air commpreser
Post by: Keith and Joyce on January 27, 2021, 01:54:31 pm
Someone is selling a Viair unit on the iRV2 forum. Just saw the post and thought it might help.
Title: Re: Portable air commpreser
Post by: Pierce & Gaylie Stewart on January 27, 2021, 02:04:25 pm
Kevo,
Why not just use the coach compressor to air the tires? I run impacts, spray guns, etc off the coach air. It's right there and FREE. If you have it turned to 120 psi, that's plenty for any tire. There should be a quick connect in the compartment close to the entry. If not, install one. I have a reel there with a dryer for incoming air or on board 110v compressor air if I need it.
A 110V compressor is always going to beat a 12V compressor. I've found that a contractor's compressor is adequate for everything. Most are just noisy and won't run off an inverter so you have to start the generator.
If you are going to run an impact of 1/2" or larger, it's good to run a hose to a supply tank and then a short 1/2" ID hose to the impact. A big difference here. And don't forget a squirt of air tool oil.
A good 12V compressor is great for toad tires, inflatable kayaks, rafts, etc if away from the coach.
I've just seen too many folks buy snake oil. Everyone want's to believe what they see and hear and phony reviews or opinions only reinforce that.
Pierce
Title: Re: Portable air commpreser
Post by: folivier on January 27, 2021, 02:06:25 pm
Another option is an air doubler. Basically an air operated air compressor. They work surprisingly well taking 80# or so to put out a steady 120#+. I had one for my Newell which I had 120# in the front tires due to the weight. Here is a write up of one: Installing an Air Pressure Booster (http://www.rvtechmag.com/tech/89_airbooster.php)
Title: Re: Portable air commpreser
Post by: Pierce & Gaylie Stewart on January 27, 2021, 02:17:13 pm
Nice concept but check the price: Haskel 17711 Air Amplifier Pump Aad-5 150 PSI Pressure for sale online | eBay (https://www.ebay.com/c/667731936) Engine compressor can put out 120 psi or more. Just takes a screwdriver if existing pressure is 100 psi or so.
Pierce
Title: Re: Portable air commpreser
Post by: Michelle on January 27, 2021, 02:21:28 pm
I have this model. I have certainly used it up to 110 but you can see the detailed specs up to 130 and 150. 400P-RV Automatic Compressor | VIAIR (http://www.viaircorp.com/portables/400p-rv-auto)
We have and really like the 100% duty cycle big brother, the 450p-rv
Why not just use the coach compressor to air the tires? I run impacts, spray guns, etc off the coach air. It's right there and FREE. If you have it turned to 120 psi, that's plenty for any tire. There should be a quick connect in the compartment close to the entry. If not, install one. I have a reel there with a dryer for incoming air or on board 110v compressor air if I need it.
A 110V compressor is always going to beat a 12V compressor. I've found that a contractor's compressor is adequate for everything. Most are just noisy and won't run off an inverter so you have to start the generator.
If you are going to run an impact of 1/2" or larger, it's good to run a hose to a supply tank and then a short 1/2" ID hose to the impact. A big difference here. And don't forget a squirt of air tool oil.
A good 12V compressor is great for toad tires, inflatable kayaks, rafts, etc if away from the coach.
I've just seen too many folks buy snake oil. Everyone want's to believe what they see and hear and phony reviews or opinions only reinforce that.
Pierce
Yeah I know what you mean, every 12 volt compressor I've looked at today, just don't look like their man enough to put 120 psi into my tyres even though they say they are 150.psi, tell me am I right in thinking that cfm is determined by the size of the tank itself, so if I had a 150 psi compressor with say a hundred ltr tank, if I connected another 100ltr tank In line, would that double the cfm or does the cfm come from the actual compressor motor itself, as in a higher wattage compressor?
Title: Re: Portable air compressor
Post by: Realmccoy on January 27, 2021, 02:26:12 pm
I had a 150psi Porter Cable pancake compressor already. I leave it in the bay and it does require 110, but I have a generator when I don't run it off camp service. Cheap, powerful and versatile. My coach does not yet have an external outlet for coach air. Most of the time I don't have to take it out to use it. Short extension cord and 50' hose on a reel for electric cords.
Title: Re: Portable air compressor
Post by: Protech Racing on January 27, 2021, 02:29:35 pm
120PSI is a whole lot for a GV with DD. IMHO. My Cat is heavier and runs at 85#rear. I use the bus to air up ,BTW wait for the purge, count for 2 min, hit the tires.
Title: Re: Portable air compressor
Post by: Pierce & Gaylie Stewart on January 27, 2021, 02:38:02 pm
This is all you really need for anything. Note the regulator/dryer at the top of the photo. It's plugged in a contractor's compressor but with a quick plug, the engine compressor supplies air to the reel. The rubber hose on the reel was junk so I replace with a poly hose.
Why is 120 psi a lot for a DD? It came at 110 psi stock so only took a partial turn on the governor to add 10 psi. I know a lot of people set theirs at 130 psi. Yes, wait for the purge and away you go.
A CAT 3208 is a flyweight compared to a 6V-92TA. A lot of people put this small engine into pickups. Excellent conversion.
Pierce
Title: Re: Portable air compressor
Post by: kevo0000 on January 27, 2021, 02:39:33 pm
Why not just use the coach compressor to air the tires? I run impacts, spray guns, etc off the coach air. It's right there and FREE. If you have it turned to 120 psi, that's plenty for any tire. There should be a quick connect in the compartment close to the entry. If not, install one. I have a reel there with a dryer for incoming air or on board 110v compressor air if I need it.
A 110V compressor is always going to beat a 12V compressor. I've found that a contractor's compressor is adequate for everything. Most are just noisy and won't run off an inverter so you have to start the generator.
If you are going to run an impact of 1/2" or larger, it's good to run a hose to a supply tank and then a short 1/2" ID hose to the impact. A big difference here. And don't forget a squirt of air tool oil.
A good 12V compressor is great for toad tires, inflatable kayaks, rafts, etc if away from the coach.
I've just seen too many folks buy snake oil. Everyone want's to believe what they see and hear and phony reviews or opinions only reinforce that.
Pierce
I haven't got an air compressor fitted on my 1990 8.2ltr cause haven't got air susipension, however when I bought my second hand engine it did actually come with a bendix tuflow compressor, but only prob with that is, where it was positioned on the engine it stuck up too high and I wouldn't have been able to put my bed in the back all the way down and also where it was positioned was in the same place as where my aircon pump is positioned, I would love to come up with an idea what to do with this pump I have, I did think of connecting it up to a very small engine and driving it on the pulley, but the other problem is that this compressor needs to be connected to oil supply and coolant supply, so would take alot of thinking, I don't even know what the maximum pressure this pump puts out, it looks a good one and really heavy
Title: Re: Portable air compressor
Post by: Protech Racing on January 27, 2021, 02:43:58 pm
120 in the tires is a lot . 120 psi for the air system is fine.
Title: Re: Portable air compressor
Post by: kevo0000 on January 27, 2021, 02:44:52 pm
120PSI is a whole lot for a GV with DD. IMHO. My Cat is heavier and runs at 85#rear. I use the bus to air up ,BTW wait for the purge, count for 2 min, hit the tires.
Hya Mike, my Michelin on the front, says on tyre 95 psi, but have recently replaced the 4 rear tyres with Dunlops and it is written on the tyre 120psi, I had Michelins on the back before and they were only 95, different manufacturers must have different tyre pressures
Title: Re: Portable air compressor
Post by: Protech Racing on January 27, 2021, 02:47:33 pm
Find the load chart for your tires. 120 sounds like max load, printed onthe sidwall. Way too high most of the time .
Title: Re: Portable air compressor
Post by: prfleming on January 27, 2021, 03:08:31 pm
The 12v Viair units are nice but the CFM at higher pressure is low.
The dual ARB is excellent, Don's project is in the link below above my post.
Here is another option, a 12v compressor I built up a few years ago. This could air up the air bags in about 6 minutes, and easily topped up the coach tires.
12v aux compressor (https://www.foreforums.com/index.php?topic=25318.msg200232#msg200232)
Here is an updated link for the compressor
ExtremeAire Magnum 12 Volt Compressor (http://www.extremeoutback.com/product/extremeaire-magnum-12-volt-compressor/)
Title: Re: Portable air compressor
Post by: Pierce & Gaylie Stewart on January 27, 2021, 03:21:49 pm
Find the load chart for your tires. 120 sounds like max load, printed onthe sidwall. Way too high most of the time .
Run the tire pressure you are happy with with the sidewall pressure showing the maximum load the tire is rated for. I max the pressure on the coach as well as my bus. My fire dept also maxed the pressures. We never weighed the apparatus, just put tools and water on board and checked the tires once a week.
These are cold pressures and will be higher after a few miles or in hot weather. Not to be reduced.
A million old posts on tire pressure so will leave it at that.
Pierce
Title: Re: Portable air compressor
Post by: Protech Racing on January 27, 2021, 03:51:21 pm
At least we say the same thing every time 😇 But in Kevin's situation, I think that he is trying to solve a problem that he doesn't have. Finding the load chart will most likely show that he has enough air pressure with what he has. Without spending any money at all.
Title: Re: Portable air compressor
Post by: Dakota Slim on January 27, 2021, 05:10:46 pm
Hya pierce, thanks for that info, just looked at the one you just showed me on ebay, but im always a bit dubious when I see the price, it just seems to be too cheap but then sometimes a cheap one can be as good as a really expensive one, I've been looking on and off all day, there are so many on the market, I'm in 2 minds which is better, at the moment I have a dewalt mains operated 120 psi with a small tank but it actually cuts out at 115 psi and the problem I find is that I will fill the tank to115 psi and get some air in tyre but as the pressure drops I have to stop and wait for the tank to fill up again, it's fine with the front tyres cause they only take 95psi but it works, but obviously il need 150psi minimum, but do you think I am better off getting a mains compressor with a reasonable size tank as opposed to a 12volt, because all of the 12volt compressors seem to have such tiny little tanks and the last thing I want is to buy something that even though it will get me 120psi, I don't want it to take like hrs to do so, I've seen a few on ebay that say they are good for heavy trucks, and in the specifications it will tell you that it takes 2 or 3 minutes to go from flat to 30 psi but when I contact them and ask them how long it will take to pump my tyres to 120 psi, I just get a reply saying that they do not know, I know its all about cfm as well as psi, so I will look at a few that some of the other members have put up, thanks alot kev
The good thing about ebay is you can see how many were sold, and you can read the feedback left by the buyers. In this case, over 800 have bought the item.
Title: Re: Portable air compressor
Post by: Pierce & Gaylie Stewart on January 27, 2021, 07:07:08 pm
If anyone thinks a little 12V compressor is going to fill their tires from zero, they must have lots of patience. And when the compressor starts to smoke or soften the plastic fittings, that's what "duty cycle" is all about.
Pierce
Title: Re: Portable air compressor
Post by: bpal on January 27, 2021, 07:35:58 pm
My "portable" compressor at home is the Makita 5200. I found one on craigslist with a auxiliary tank for $150. Easy to wheel from the garage to the coach on the side of the house. With the handle folded down its not much bigger than my old pancake compressor and much more capable, quieter, and easier to move. An old school, oil bath compressor will last forever compared to the disposable oil-less pumps. 6.5 CFM @ 90PSI Makita USA - Product Details -MAC5200 (http://www.makitatools.com/products/details/MAC5200)
Title: Re: Portable air compressor
Post by: Pierce & Gaylie Stewart on January 27, 2021, 09:07:11 pm
My main compressor is an old Kellogg 2 stage compressor from my teens. Nothing done to it and it's still great and runs everyday. I also have a Quincy compressor from diving days. Lots of divers would not go down without a Quincy on deck.
Pierce
Title: Re: Portable air compressor
Post by: kevo0000 on January 28, 2021, 09:42:51 am
If anyone thinks a little 12V compressor is going to fill their tires from zero, they must have lots of patience. And when the compressor starts to smoke or soften the plastic fittings, that's what "duty cycle" is all about.
Pierce
Hya pierce, I've just come up with an idea tell me what you think, my bendix tu flow compresser I have, I'm thinking of making a frame attaching the compressor to this frame, using an old washing machine 240 volt motor fitting a pulley to it, I then also would have to connect an oil pump with a small oil tank, also a separate water tank with pump, and then connecting it to a large co2 bottle, looking at the tu flow diagrams, I would also need an air dryer fitted in line between pump and tank, would this work, I'm on lockdown at the moment got plenty of time to kill, got plenty strong timber for the frame and an old plant trolley with strong wheels which I could use, do I need the correct air dryer for the bendix or will any air dryer do the job, seems a waste that I have got a good working compressor, I've even got an old washing machine motor to drive it, what do you think, any reason why this wouldn't work?
Title: Re: Portable air compressor
Post by: folivier on January 28, 2021, 09:47:25 am
This is the air doubler I mentioned above: https://www.smcpneumatics.com/VBA10A-N02GN-Z.html Not the very expensive one Pierce posted.
Title: Re: Portable air compressor
Post by: Pierce & Gaylie Stewart on January 28, 2021, 10:57:29 am
This is the air doubler I mentioned above: https://www.smcpneumatics.com/VBA10A-N02GN-Z.html Not the very expensive one Pierce posted.
Forest,
Excellent eyes to have spotted it. Now, that is in the price range for a practical device that won't break the bank. I'm assuming that they waste quite a bit of air, sort of like a home RO water system but I really don't have an ideal how efficient they are.
Kevo,
Sounds reasonable but I have no idea how much HP you would need. My old Kellogg has a 2 hp 220 motor. The motor is fairly big and heavy. As far as a tank goes, any old BBQ propane tank would be good as their burst pressure is about 960 psi. The bigger the better. At home, I use a HF inline dryer, you know, the tiny one with a pressure regulator next to it most of the time. When I'm serious, I plug into a wall regulator with filter/dryer next to it. At the hanger, galvanized pipe is mounted on the wall going way up and then down and has a drain at the bottom. Gary has expensive guns and the latest is a trick German Iwata or SATA gun costing hundreds. It paints aircraft and I don't ever recall it spitting out any water. I use an inexpensive HF gun. Does a great job for under $50.
I think my Kellogg puts out about 12 cfm or did when it was new. The Quincy puts out more but lower pressure so it just sits outside waiting for some TLC. Lots of ideas here about building an air dryer on this page. Instead of spending $50 as he did, how about going to a junk yard and just getting a car AC condenser? https://www.youtube.com/watch?v=KgO2hTmtlvA
Our U300 has a regulator, filter/dryer next to the air hose reel.
I expect the biggest expense will be the capacitor start 2 hp or more electric motor. Try CL or F. Marketplace. Just depends on what you are going to be doing with it. Sand blasting takes the most CFM, impact guns take a lot less, spray paint a medium amount and powder coating uses very little for most work. If the motor is too small, you can change pulley size but the compressor may jerk a bit at low speeds.
Again, YouTube has a lot of great ideas from people like you. Keep posting as the project develops.
Pierce
Title: Re: Portable air compressor
Post by: folivier on January 28, 2021, 11:52:50 am
Pierce, yes it's just another tool to make it easier to get a higher pressure out of whatever compressor you're using. It does waste air but that air is basically free. You're just using it to pump up to a higher pressure. But if you're waiting for your engine air compressor to cycle back up you're wasting diesel. Or electricity if it's an electric compressor. Ain't no free lunch.
Title: Re: Portable air compressor
Post by: kevo0000 on January 28, 2021, 12:11:17 pm
Pierce, yes it's just another tool to make it easier to get a higher pressure out of whatever compressor you're using. It does waste air but that air is basically free. You're just using it to pump up to a higher pressure. But if you're waiting for your engine air compressor to cycle back up you're wasting diesel. Or electricity if it's an electric compressor. Ain't no free lunch.
Il be running it off my 3kw inverter 6kw start up, but what il do is run the car engine with jumper leads on the villa batteries, I had new tyres fitted back in the summer, and took the wheels in back of car to get them pumped up to pressure, but I don't want to have to take them off to keep doing that, it's nearly ready for the road but I'm not planning on going anywhere in it yet because of the lockdown, it's till end of march now, hopefully by then most people would have had the vaccine, 'where I live in Cornwall the infection rates are still quite low compared to rest of country
Title: Re: Portable air compressor
Post by: Pierce & Gaylie Stewart on January 28, 2021, 01:54:23 pm
Pierce, yes it's just another tool to make it easier to get a higher pressure out of whatever compressor you're using. It does waste air but that air is basically free. You're just using it to pump up to a higher pressure. But if you're waiting for your engine air compressor to cycle back up you're wasting diesel. Or electricity if it's an electric compressor. Ain't no free lunch.
Forest,
Don't get me wrong, I'm not worried about wasting air, diesel or electricity but if you have a small CFM compressor and lose 30% because of device loss, you will need to wait longer for the compressor to build pressure. I have no idea of the loss the pressure amplifier has so the 30% was just a guess. Perhaps it's not a factor in the real world usage. Guess my question relates to how practical is it to fill a big tire from zero to 110 psi with a small compressor and a pressure amplifier?
Pierce
Title: Re: Portable air compressor
Post by: folivier on January 29, 2021, 09:29:24 am
Never filled a tire from zero, just used to top off pressure to what I was running. If I had to fill a tire from zero or lower pressure I wouldn't use the doubler until the compressor got close to its cutout point. At that point the doubler is much faster than waiting for the compressor to cycle.