Tank air system
- ChristoSlang
- Patrolman
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- Full Name: Christo van Rensburg
- Nickname: ChristoSlang
- Home Town: Pretoria, ZA
- Current 4x4: Nissan 4.2 GL Patrol
- Home Language: Afrikaans
- Location: Garsfontein, Pretoria
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Tank air system
I finally completed my Patrol's tank air system today!
When I bought the Patrol, it came equipped with a compressor mounted in the engine bay. This is a single-head jobbie, and takes about 5 minutes per 12.5" x 33" tyre to raise the pressure from 150 to 200 kPa (1.5 -> 2 bar). 20 minutes may not sound long, but it is when you're done playing and just want to get on the road again. So I bought myself one of these compressor/tank combos from a place that closed their doors in Cape Town last year: I liked the price (about R700), but not the size of the thing. It was more "luggable" than portable, and wasted a lot of space inside the vehicle. So I proceeded to take the whole thing apart so that I could mount the pump inside the back of the Patrol, and the reservoir tank underneath the car. My Patrol does not have the extra fuel tank, so I decided to mount the tank in it's place. I welded up a bracket that hooks over the top of the frame and rests against the bottom. Some extra bits of steel offer protection for the tank and fittings, and a layer of chassis paint made it a bit more durable. I pugged up all the holes leaving just two - one for incoming air and another for outgoing air. There's also drain screw at the bottom to release accumulated moisture from. It fitted REALLY tight over the frame, and only needed a single Tek screw at the bottom to keep the bracket from moving backwards and forwards.
When I bought the Patrol, it came equipped with a compressor mounted in the engine bay. This is a single-head jobbie, and takes about 5 minutes per 12.5" x 33" tyre to raise the pressure from 150 to 200 kPa (1.5 -> 2 bar). 20 minutes may not sound long, but it is when you're done playing and just want to get on the road again. So I bought myself one of these compressor/tank combos from a place that closed their doors in Cape Town last year: I liked the price (about R700), but not the size of the thing. It was more "luggable" than portable, and wasted a lot of space inside the vehicle. So I proceeded to take the whole thing apart so that I could mount the pump inside the back of the Patrol, and the reservoir tank underneath the car. My Patrol does not have the extra fuel tank, so I decided to mount the tank in it's place. I welded up a bracket that hooks over the top of the frame and rests against the bottom. Some extra bits of steel offer protection for the tank and fittings, and a layer of chassis paint made it a bit more durable. I pugged up all the holes leaving just two - one for incoming air and another for outgoing air. There's also drain screw at the bottom to release accumulated moisture from. It fitted REALLY tight over the frame, and only needed a single Tek screw at the bottom to keep the bracket from moving backwards and forwards.
- ChristoSlang
- Patrolman
- Posts: 851
- Joined: 07 Apr 2009 16:54
- Full Name: Christo van Rensburg
- Nickname: ChristoSlang
- Home Town: Pretoria, ZA
- Current 4x4: Nissan 4.2 GL Patrol
- Home Language: Afrikaans
- Location: Garsfontein, Pretoria
- Has thanked: 17 times
- Been thanked: 116 times
Tank air system (continued)
I ran two nylon pipes from the tank, entering at the left-hand rear of the car.
One of the pipes is connected to the pump, which is mounted on a bracket where the 3rd row seats used to be. The bracket also houses a multi-plug that's connected to an inverter that lives in the side storage area behind the pump and lifts the pump high enough for the air outlets to clear the storage bin. I retained the original fittings that exit the two pump "heads" (another non-standard size item), joined them together and fed them into a one-way valve (just visible behind the left-hand bottom of the pump). I also re-used the rubber feet when mounting the pump to the bracket to minimise vibration when the pump runs. The other pipe leads to the inflator fitting. I discarded most of the original items - a pressure regulator, two crappy dials and a male (doh!) quick-fit connector. In its place I have a better quality gauge tha read up to 800 kPa, a female quick-coupler, the original pressure release valve and the original pressure switch to manage the pump. The pump is activated by a switch on the dashboard (only active with the ignition), which is then fed through the pressure switch and finally used to activate a relay that turns the pump on and off. I used nice thick wiring everywhere, coupled with decent fuses. The wiring & high-pressure hoses are all covered with addditional shrouding and cable tied out of the way as much as possible.
One of the pipes is connected to the pump, which is mounted on a bracket where the 3rd row seats used to be. The bracket also houses a multi-plug that's connected to an inverter that lives in the side storage area behind the pump and lifts the pump high enough for the air outlets to clear the storage bin. I retained the original fittings that exit the two pump "heads" (another non-standard size item), joined them together and fed them into a one-way valve (just visible behind the left-hand bottom of the pump). I also re-used the rubber feet when mounting the pump to the bracket to minimise vibration when the pump runs. The other pipe leads to the inflator fitting. I discarded most of the original items - a pressure regulator, two crappy dials and a male (doh!) quick-fit connector. In its place I have a better quality gauge tha read up to 800 kPa, a female quick-coupler, the original pressure release valve and the original pressure switch to manage the pump. The pump is activated by a switch on the dashboard (only active with the ignition), which is then fed through the pressure switch and finally used to activate a relay that turns the pump on and off. I used nice thick wiring everywhere, coupled with decent fuses. The wiring & high-pressure hoses are all covered with addditional shrouding and cable tied out of the way as much as possible.
- ChristoSlang
- Patrolman
- Posts: 851
- Joined: 07 Apr 2009 16:54
- Full Name: Christo van Rensburg
- Nickname: ChristoSlang
- Home Town: Pretoria, ZA
- Current 4x4: Nissan 4.2 GL Patrol
- Home Language: Afrikaans
- Location: Garsfontein, Pretoria
- Has thanked: 17 times
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Re: Tank air system
So, how does it perform?
The 8 liter tank takes about 3-4 minutes to get fully pressurised. The pressure switch cuts power to the relay at about 750 kPa, as can be seen in one of the photographs. I deflated one tyre to 1.5 bar and connected the inflator hose. Hmmmm... that was not so easy at all. Next time I'll connect it before pressurising the system!
Re-inflating the tyre from 150 kPa - 200 kPa took no more than 25 seconds, but dropped the pressure in the tank enough to get the pump started again. By the time I had checked the pressure, added a spurt or two more air, then checked the pressure again, the pump had stopped again - ready for another tyre!
I will do more tests next week when we're holidaying in southern Mocambique, but I am sure that the combination of a more capable pump & reservoir tank will more than halve the time spent to re-inflate my tyres...
The 8 liter tank takes about 3-4 minutes to get fully pressurised. The pressure switch cuts power to the relay at about 750 kPa, as can be seen in one of the photographs. I deflated one tyre to 1.5 bar and connected the inflator hose. Hmmmm... that was not so easy at all. Next time I'll connect it before pressurising the system!
Re-inflating the tyre from 150 kPa - 200 kPa took no more than 25 seconds, but dropped the pressure in the tank enough to get the pump started again. By the time I had checked the pressure, added a spurt or two more air, then checked the pressure again, the pump had stopped again - ready for another tyre!
I will do more tests next week when we're holidaying in southern Mocambique, but I am sure that the combination of a more capable pump & reservoir tank will more than halve the time spent to re-inflate my tyres...
Last edited by ChristoSlang on 26 Oct 2009 23:21, edited 1 time in total.
- JohnBoyZA
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- Ian Abrahamson
- Senior Member
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Re: Tank air system
What a brilliant idea, well done.
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dedicated to offroad lifestyle
NOTHINGS IMPOSSIBLE, IT JUST COSTS MORE
- Abri Hoffman
- Patrolman
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Re: Tank air system
Looks good Christo,
I am very interested in the performance inflating all 4 tyres from 100kpa to 200 kpa. We have had many discussions on the apparent advantages of a airtank.
I am keen on such a system especially for the air suspension but am not certain of the advantages.
Would love to hear your feedback.
I am very interested in the performance inflating all 4 tyres from 100kpa to 200 kpa. We have had many discussions on the apparent advantages of a airtank.
I am keen on such a system especially for the air suspension but am not certain of the advantages.
Would love to hear your feedback.
2013 FJ Cruiser
"Jack Russel"
"Jack Russel"
- Family_Dog
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Re: Tank air system
Well done Christo, a worthwhile mod most professionally installed!
-F_D
-F_D
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- ChristoSlang
- Patrolman
- Posts: 851
- Joined: 07 Apr 2009 16:54
- Full Name: Christo van Rensburg
- Nickname: ChristoSlang
- Home Town: Pretoria, ZA
- Current 4x4: Nissan 4.2 GL Patrol
- Home Language: Afrikaans
- Location: Garsfontein, Pretoria
- Has thanked: 17 times
- Been thanked: 116 times
Re: Tank air system
Thanks gents!
I'll let SWAMBO operate the stopwatch while I test it on all four four tyres next week :idea:
I'll let SWAMBO operate the stopwatch while I test it on all four four tyres next week :idea:
- Ross
- Senior Member
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Re: Tank air system
Well done Christo, looks like a well thought out and very professionally executed mod.
I need to think of a creative location for an air tank on my trol, as my LR tank already takes up the space where you did your fitment.
Ross
1998 GU 4.2 Turbo Diesel: 2" OME, 33" Big Horns, 2x LR Tanks, Safari Snorkel, Dual Battery, Drawer System, etc etc
aka "The Polar Bear"
1998 GU 4.2 Turbo Diesel: 2" OME, 33" Big Horns, 2x LR Tanks, Safari Snorkel, Dual Battery, Drawer System, etc etc
aka "The Polar Bear"
- Abri Hoffman
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Re: Tank air system
What about the other side of the prop next to the exhaust. Nice big space there. May need to insulate a little with glass tape of the likes.Ross wrote:
Well done Christo, looks like a well thought out and very professionally executed mod.
I need to think of a creative location for an air tank on my trol, as my LR tank already takes up the space where you did your fitment.
2013 FJ Cruiser
"Jack Russel"
"Jack Russel"
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