SuiteSuccess Posted October 6, 2018 Report Share Posted October 6, 2018 I have an air hose which runs off the truck tanks that used to be for trailer brakes (the red knob). That tank builds to 125-130 psi and will discharge down to 100 psi before the compressor kicks on. My coach tires need 120 psi for the weight. I find when I get toward that pressure I have to stop and get the truck compressor to kick back on and get the pressure back up to finish airing. Air flow stops as the tire pressure becomes higher than the tank pressure. Maybe a dumb question is there a way to add a permanent auxiliary tank, say 6 gallon (which I already have at home), and compress the compressed air up to say 150-160 psi without breaking the bank? I once read about a mechanical air pressure booster system to do just that but it was close to$500. Not trying to limit discussion but I already know I could buy a Viar, or various other portable compressors but that is not the discussion I’m exploring. I already have a 150 psi pancake that I use at home. Just don’t want to lug it on the road. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
noteven Posted October 6, 2018 Report Share Posted October 6, 2018 A check valve between the truck system and the tire tank maybe? "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
adept99 Posted October 6, 2018 Report Share Posted October 6, 2018 Carl; ol' party pooper here. There just isn't much of a way to do what you are describing. You gotta have something that will squeeze the air to whatever pressure you want. Ultimately, that will be some type of compressor. You can get very high pressures from a very small compressor, but they have virtually no output volume. Consequently, it will take forever to fill your tank. On the other hand, if you use a large compressor, you can fill the tank quickly, but your compressor driver (motor/engine) will run out of power pretty quickly. So how to get from 120 psi to 160 psi? First, make sure your tank and piping (including hoses and fittings) are rated for your highest pressure plus 25%. Then you can decide to upgrade your compressor to one that will make air to the pressure you want. Now, if your existing air tanks and brake cans ever see that pressure, right after you hear a loud "POP", hang on because it will be an exciting ride down the next hill. Not Really. It can be done, but it takes a series of valves and connectors and I would be unwilling to have my brakes tied into such a Rube Goldberg setup. I suggest you find a place to mount a small compressor and we can find a way to do a gross fill on that, and then finish with the small compressor. You really don't want to expose the truck compressor to those high pressures, and you REALLY don't want to modify it in any way. Paul Paul & Paula + Daisy the amazing wiggle worm dog... 2001 Volvo 770 Autoshift, Singled, w/ Aluminum Bed - Toy Draggin 2013 395AMP XLR Thunderbolt Toy Hauler 2013 Smart Passion 2012 CanAm Spyder RT 2013 Harley Davidson Street Glide Link to comment Share on other sites More sharing options...
HERO Maker Posted October 6, 2018 Report Share Posted October 6, 2018 OK Carl, so your tandem axle trailer is running close to full weight, demanding close to max pressure on those tires? Rocky & Sheri Rhoades '01 Volvo 770 2016 DRV Mobile Suites, HoustonHERO Makers Ministry Link to comment Share on other sites More sharing options...
HERO Maker Posted October 6, 2018 Report Share Posted October 6, 2018 On my triples, I only use 100lbs. Rocky & Sheri Rhoades '01 Volvo 770 2016 DRV Mobile Suites, HoustonHERO Makers Ministry Link to comment Share on other sites More sharing options...
Mark and Dale Bruss Posted October 6, 2018 Report Share Posted October 6, 2018 When we were faced with this, we bought a Power Tank, a compressed CO2 tank with a regulator. It is silent. We set the regulator to 170 psi for the truck and trailer tires. You need to be higher to push air into the tires. For us, a 10 lb tank lasted about a year. Please click for Emails instead of PM Mark & DaleJoey - 2016 Bounder 33C Tige - 2006 40' Travel SupremeSparky III - 2021 Mustang Mach-e, off the the Road since 2019 Useful HDT Truck, Trailer, and Full-timing Info atwww.dmbruss.com Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 6, 2018 Author Report Share Posted October 6, 2018 Rocky, First, glad you’re doing well. Second, yes my weights require higher pressure. In our older trailer required based on weight was shade over 100 but I added 10% above based on some reading. New requires 110, hence I run 120. Mark, Yeah, I like that system but was hoping I could get some ideas on using my existing and beef it up a bit. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 6, 2018 Author Report Share Posted October 6, 2018 Paul, As I mentioned there is a mechanical “piston” system that can increase pressures but it is expensive. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
porky69 Posted October 7, 2018 Report Share Posted October 7, 2018 Easiest way for pressure and volume would probably be a Power Tank like said above. Power Tank Link to comment Share on other sites More sharing options...
Ronbo Posted October 7, 2018 Report Share Posted October 7, 2018 I bought an aluminum co2 tank with a handle. I already had regulator. Fill up trailer tires first and then truck tires. I also use it off road for the Jeep. Ron C. 2013 Dynamax Trilogy 3850 D3 2000 Kenworth T2000 Optimus Prime Link to comment Share on other sites More sharing options...
Mark and Dale Bruss Posted October 7, 2018 Report Share Posted October 7, 2018 Using the truck compressors is about as expensive a compressor as you can get and it is not designed for filling tires.. Mine was $700. Please click for Emails instead of PM Mark & DaleJoey - 2016 Bounder 33C Tige - 2006 40' Travel SupremeSparky III - 2021 Mustang Mach-e, off the the Road since 2019 Useful HDT Truck, Trailer, and Full-timing Info atwww.dmbruss.com Link to comment Share on other sites More sharing options...
Lance A Lott Posted October 7, 2018 Report Share Posted October 7, 2018 I know you didn't won't to use an electric compressor but if you put a check valve then a T to a 12 volt pump then your quick conector the pump will only come on when you turn it on with a switch. No tank for the electric pump. Link to comment Share on other sites More sharing options...
BlueFlame Posted October 7, 2018 Report Share Posted October 7, 2018 Two suggestions. Check out this video for an idea on how to cause your compressor to kick in and bring the pressure back up. http://www.thervgeeks.com/miscellaneous/update-high-pressure-rv-tire-inflation/ -or- Get a scuba tank and first stage regulator. You can get tanks that hold 80 cubic feet of air at 3000 psi. They make tire inflation adapters. Should be able to top off a lot of tires with one tank, then just stop into any dive shop and get it refilled. I had the same issue, I need 120 psi on the steer axle, I played around with several methods, got frustrated, finally broke down and bought a Viair compressor. For me that was the preferred solution. Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 7, 2018 Author Report Share Posted October 7, 2018 Thanks folks. Blue Flame, That is my solution it seems. At higher pressures I was fanning the brakes to get the compressor to kick in. Funny how simple solutions evade me sometimes. Can’t be my age? 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
noteven Posted October 7, 2018 Report Share Posted October 7, 2018 Suite - check valve and compressor kicker inner on your trailer supply glad hand is solution. When you was talking about adding a tank I was confused (easy) about just how leaky those 110 psi tires are lol! Anyways I only have a few devices that need tires run anywhere near max inflation table psi - a couple motorbikes and a won ton back axle when I throw a load on him. Normal air system pressures/cycles do the trick. "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 7, 2018 Author Report Share Posted October 7, 2018 27 minutes ago, noteven said: Suite - check valve and compressor kicker inner on your trailer supply glad hand is solution. When you was talking about adding a tank I was confused (easy) about just how leaky those 110 psi tires are lol! Anyways I only have a few devices that need tires run anywhere near max inflation table psi - a couple motorbikes and a won ton back axle when I throw a load on him. Normal air system pressures/cycles do the trick. Haha, we’re in the same boat. I get confused easily. I was thinking that a second, smaller tank would give me the volume of air at a higher pressure so that I wouldn’t have to air a little bit, go fan the brakes to kick in the compressor and then wait til the truck tank refilled. At least with the valve I can get the compressor to kick in while at the tire. The old knees don’t allow me to squat and get up multiple times without paying a price. Sorry I wasn’t clear. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
wtgeodog Posted October 7, 2018 Report Share Posted October 7, 2018 An expensive solution would be to upgrade tire size to 235 75 r17.5 load range j tires. ShortyO Link to comment Share on other sites More sharing options...
Ronbo Posted October 7, 2018 Report Share Posted October 7, 2018 5 hours ago, BlueFlame said: -or- Get a scuba tank and first stage regulator. You can get tanks that hold 80 cubic feet of air at 3000 psi. They make tire inflation adapters. Should be able to top off a lot of tires with one tank, then just stop into any dive shop and get it refilled. Any ethical dive shop won’t fill a tank unless you have a dive card. Ron C. 2013 Dynamax Trilogy 3850 D3 2000 Kenworth T2000 Optimus Prime Link to comment Share on other sites More sharing options...
Steve from SoCal Posted October 7, 2018 Report Share Posted October 7, 2018 You CAN increase the air pressure your compressor develops using an intensifier. https://www.zoro.com/smc-booster-regulator-14-npt-port-vba10a-t02g-z/i/G7277238/feature-product?gclid=Cj0KCQjw3ebdBRC1ARIsAD8U0V7NSsy9kXW5zvfc9HCmGJ1CykP7EF3F1eP-vkR2Qs2NxxzsqtdP_vUaAo8pEALw_wcB Steve 2005 Peterbilt 387-112 Baby Cat 9 speed U-shift 1996/2016 remod Teton Royal Atlanta 1996 Kentucky 48 single drop stacker garage project Pulls like a train, sounds like a plane....faster than a Cheetah sniffin cocaine. Link to comment Share on other sites More sharing options...
DesertMiner Posted October 7, 2018 Report Share Posted October 7, 2018 Oops... that link takes me to vacuum parts. Link to comment Share on other sites More sharing options...
MoSKP9 Posted October 8, 2018 Report Share Posted October 8, 2018 I have the same issue. Here is my simple low cost solution. Get a combination hand held lever action air fill with gauge that has a 2ft. Extension hose with a "lock on" air fill chuck. Lock onto valve stem and fill tire while truck is running. You can control air pressure with the lever to let off air rapidly if you have to to keep the truck compressor runnning. You will get the hang of it after a few tries. I'm at the HDT rally right now and if you are also here and want to look at my set up I'll be happy to show it to you . Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 8, 2018 Author Report Share Posted October 8, 2018 My inelegant solution. Plugs into air hose and inflation gauge plugs into quick connect. Ring is “pop off” valve I had lying around. Pull the ring to decrease pressure below 100 psi where truck compressor kicks in. That way can get fill pressure back above 120 psi. Two 1/4” tees, one 1/4” nipple. Rest were supplies I had lying around. Worked great with my pancake compressor. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
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