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Discussion Starter #1
Anyone tried one of these?

Wonder how much difference it makes with your typical 4wd compressor.
 

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nissan
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I'd be interested to know if when you remove the pin will your compressor be able to push hard enough to compensate the extra air pressure already in the tyre.?.
 

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1989 GQ TD42 wagon
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What is the flow limit imposed by a tyre valve with core fitted, versus without? If your compressor can't max out the valve with the core in it, removing the valve core is not going to make a noticeable difference.
 

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nissan
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The pressure will be the same if the tyre has 30 psi with a valve core, it will still have 30 psi without a valve core, the difference between the two is the flow rate, as with no valve core, you remove a restriction, when deflating, it is obvious the valve is a massive restriction to air flow and so the speed of deflation.

This is a problem ive found with TPMS on the 62, even with the valve core removed, it takes ages to deflate a tyre (compared to non TPMS) thanks to the restriction imposed by the TPMS sensor, same goes for inflating, its a slower process, but not as noticeable on inflation, because you have the valve core in place as a restriction in both TPMS and non TPMS vehicles.
 

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Discussion Starter #5
The video in the link shows a massive increase in inflation speed but thats off a workshop compressor.
Ive just orderd one for a Christmas present for my old man so ill report back some time in the new year once we have tested it out.
 

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The video in the link shows a massive increase in inflation speed but thats off a workshop compressor.
Ive just orderd one for a Christmas present for my old man so ill report back some time in the new year once we have tested it out.
I await the results with interest. Do you have a suitably small, crappy compressor to test it with? Something like these:


 

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Y2KGUII ZD Wgn
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I maybe missing something here but I'm not sure I need anything like that device, after research I replaced my earlier big red (had since 90's) with a DR Air Pro Flow 150, it pumps a tyre from 15psi to 40psi in two minutes, one of the slowest parts of the exercise was screwing the damned supplied fitting onto the valve, I replaced this with a clip on not long after buying this and that was quite a few years ago, how much time is it really going to save?
 

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Discussion Starter #8

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Discussion Starter #9
I maybe missing something here but I'm not sure I need anything like that device, after research I replaced my earlier big red (had since 90's) with a DR Air Pro Flow 150, it pumps a tyre from 15psi to 40psi in two minutes, one of the slowest parts of the exercise was screwing the damned supplied fitting onto the valve, I replaced this with a clip on not long after buying this and that was quite a few years ago, how much time is it really going to save?
Is that for a 31" tyre thats only 10" wide, roughly? How long would said compressor take to pump up a 33x12.5x15 or a 35 for that matter?
I know it seems like such a trivial thing an extra couple of minutes after a day wheeling. But its always a chore no matter how quick you can do it. So anything that can make the job of airing up quicker will have a market.
 

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Y2KGUII ZD Wgn
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Is that for a 31" tyre thats only 10" wide, roughly? How long would said compressor take to pump up a 33x12.5x15 or a 35 for that matter?
I know it seems like such a trivial thing an extra couple of minutes after a day wheeling. But its always a chore no matter how quick you can do it. So anything that can make the job of airing up quicker will have a market.
Actually closer to 32", I see no reason why a 33" would take anything seriously longer, 35's yes.
 

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Discussion Starter #11
Just a quick calculation comparing 31x10.5x16 and 33x12.5x15 gives me more than 33% more litres in the larger tyre.
 

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Y2KGUII ZD Wgn
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Just a quick calculation comparing 31x10.5x16 and 33x12.5x15 gives me more than 33% more litres in the larger tyre.
2min x 33% makes around 40 seconds, :).
 

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Nissan MK,GQ & now GU.
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I used to have an ARB blue tongue compressor. I could time it perfectly to pump up 35 tyres. Half a can of beer, per man, per tyre, perhaps.

Now have compressor from Aldi for years. Saves me beer. Probably two sips per tyre.
 

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Discussion Starter #14
Just to be clear where i got that from i have just gone the volume of a cylinder with tyre dimensions minus volume of a cylinder for rim dimension. I know this isnt super accurate but for comparison i think its fair.

So 31x10.5x16 gives 6313 cubic inch
Tyre - 7921 a 16x8 rim 1607

33x12.5x15 gives 9184 cubic inch
Tyre - 10v685 a 15x8.5 rim 1501
31% more than 31x10.5x15

35x12.5x15 gives 10519 cubic inch
Tyre - 12020 and a 15x8.5 rim 1501
13% larger than 33x12.5x15
40% larger than 31x10.5x16

Well that surprised me so happy to have my calculations scrutinized.
 

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I have a "valve cap" with a core removal tool on top. It's a little tool that I ended up with at some point (can't remember where I got it from) when I was an avid mountain biker running tubeless tyres 15-odd years ago. The idea is that you screw it on to your mountain bike wheel instead of a normal valve cap and when you get a flat, you unscrew the core before inflating with a CO2 cartridge. It's quite difficult to reset a tubeless bicycle tyre bead, so removing the core is important as you need all the help you can get.

I now have this, screwed on to a spare valve stem, in my glove box. I normally unscrew the core when deflating, but like most people here seem to indicate, inflating with or without a valve core doesn't make a significant difference when using a 12V compressor.

Also, I try to limit the number of times I remove the core, because if you drop it in the sand/mud, you're in s...t.

526536


Didn't cost me anywhere near $66, though...
 

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Discussion Starter #16
2min x 33% makes around 40 seconds, :).
I would hazard a guess (and im happy to be shown otherwise) that the relationship between volume and pressure isnt linear.

Anyway like i said im happy to test it out and report back with some more beer coaster science.
 

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That would be Ok if you only did beach off roading, but I don't think it would last too long in the scrub & rocks.
 

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That would be Ok if you only did beach off roading, but I don't think it would last too long in the scrub & rocks.
Would be nice for a thru the hub design.


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