Thread: Simultaneous inflation.deflation of tyres.

Originally Posted by Aussie Jeepster

Not strictly Discovery related, but with all the discussions I've seen on airing up and airing down, this gadget looks the goods.
INDE FLATE - YouTube

Indeflate

Find a roadworks site and look at the arrangement on most pneumatic tyre rollers. For decades these have been equipped with a system known as "Air on the Run". The operator can inflate and deflate tyres at will. The plumbing involved would be a bit vulnerable to damage in off road work.

I’ve watched the video, and I find myself asking.. Why?

What has or hasn’t been gained by this?

Originally Posted by Tombie

I’ve watched the video, and I find myself asking.. Why?

What has or hasn’t been gained by this?

Same. How does it differentiate between each tyre? Guessing 2 valves.

Airing up/down is really no big deal if you have a decent tyre deflator and a good air compressor.
It also gives you the opportunity to check the vehicle for any damage as well

I’ll stick with my stauns, they deflate quick enough for me....they would be close to being the quickest way your deflate 4 tyres.

Originally Posted by weeds

I’ll stick with my stauns, they deflate quick enough for me....they would be close to being the quickest way your deflate 4 tyres.

Agreed...

Whilst not condoned when we were staying at Robe for example - I would often fit the Stauns as we left the camp site and just drive along as the tyres deflated. Next stop I would remove and refit the caps.

The unit above seems slower - I need to remove a cap, fit the hose.. go other side, remove cap and fit hose. Return to middle and deflate (approx twice as long as it’s twice the volume.)

Then remove and cap both sides.. and then head to the other end..

With Stauns or equivalent- undo, fit, next wheel; repeat 4 wheels.
By the time I’ve done the lap it’s time to lap again and remove and re-cap...

This is similar to another product from the US:
2air/4air/6air Tire Inflator - Deflator

I've been seriously thinking about getting a 2air. Since somebody asked why, let me explain.

It's really hard to get all your tyres to equal pressure in a hurry if you do them individually, because:
1. When you change the pressure in one tyre you alter the stance of the vehicle and therefore the pressure in every other tyre
2. Tyres are usually cooling down while you're working on them, meaning the first tyre you do will end up lower than the last one (because it continues to drop pressure after you walk away from it)

These differences aren't a big deal front-to-back because we normally need differences there anyway. But side-to-side differences are not nice, especially on the front where it pulls your steering off centre.

If you can connect two tyres on opposite sides with something like this Indeflate or a 2air, the pressure will naturally equalise between them. You can use the centre tap to add or remove air to both tyres at once, and the pressures will end up identical.

The other reason I'd like something like this is because my compressor doesn't have a tank, the only on/off switch is on the compressor, and the pressure gauge and deflator button is on the far end of the hose. So there's always high pressure in the hose while inflating, meaning the gauge isn't telling me what the pressure inside the tyre is. I have to turn off the compressor to get a reading (once the pressure in the hose and in the tyre equalises).

My current tyre inflation routine is to leave the pump on while I inflate all the tyres to an indicated hose pressure above 50psi, turn the pump off, then return to each wheel to check the actual pressure (it's typically about 10psi lower than the hose pressure was) and hopefully lower things down a little.

With a 2air I could connect up a pair of wheels, walk back the compressor, switch it on, wait for the pressure to go high (eg 50psi), switch the compressor off and get a reading right there. Make adjustments up/down as needed. Voila, two wheels done perfectly. Repeat for the other axle.

Totally disagree....

When you go to air up a vehicle from say 18psi to 36psi and you inflate 1 tyre... the others don’t change at all..
It’s odds on you’re never on a perfectly flat surface either.

If you want it, go for it... it’s just another bit of bulk to add to the vehicle and no serious benefits are derived from it.