Thumper Twin Air Compressor install

#1
Gday all, I have just had the above compressor delivered and I am intending on hard wiring / mounting it somewhere on my 60series cruiser.
I am thinking of re-wiring it with 2b&s cable, installing a 120amp circuit breaker, and using the cars existing rear window demister switch as the on/off switch (as the Dempster has never worked...)
My main issue is where to mount it... I am hoping to go under the car somewhere, but was wondering if it can be installed on its side?. I will strip the compressor as much as I am game to, and hopefully install a hose and filter for the air intake.
Any ideas (or potential issues) with what I have described above would be greatly appreciated!!

Thanks!

Drew
 

CB23

New Member
#3
i'd like to have the compressor switch at the end of the compressor hose, and plan to do this to mine soon. Just an idea...
 

CB23

New Member
#5
A remote control on/off switch would be great - but I can’t see myself going to the effort!
I'm just going to use a cable taped to air hose, and a switch from Jayco. Should be fairly simple. Also the other issue with the thumpers is the screw on valve connector, a clip on valve connector would be much better.
 
#6
I might have to re-assess the cable size... I didn’t realise the physical size of 2b&s!
Also, am struggling on where to mount it... I have spent the last hour dragging it all over the car - inside, outside, underneath, on the rear wheel carrier etc to find a suitable place, but nothing has jumped out at me as being ‘right’....
 

smitty_r51

Well-Known Member
#7
I might have to re-assess the cable size... I didn’t realise the physical size of 2b&s!
Also, am struggling on where to mount it... I have spent the last hour dragging it all over the car - inside, outside, underneath, on the rear wheel carrier etc to find a suitable place, but nothing has jumped out at me as being ‘right’....
i got mine changed over at gasweld i think it was. cut off the old screw fitting, and crimped on a new push and clip fitting.
 

Tink

Well-Known Member
#8
The compressor will draw a max of 90 amps (holy cow man) and Tyco’s 6B&S is rated at 103 amps. Easy to get lugs etc for 6B&S.
Tink
 

Albynsw

Well-Known Member
#9
I'm just going to use a cable taped to air hose, and a switch from Jayco. Should be fairly simple. Also the other issue with the thumpers is the screw on valve connector, a clip on valve connector would be much better.
Why do you need a switch at the end of the hose, doesn't the compressor have a pressure switch?
 
#10
Why do you need a switch at the end of the hose, doesn't the compressor have a pressure switch?
From what I have read, you have to switch the compressor off for an accurate reading the pressure gauge (much easier to do from the hose-end). I am thinking of modifying mine to use a clip-on fitting and using my existing pressure gauge that I trust the readings from...
 

Albynsw

Well-Known Member
#11
From what I have read, you have to switch the compressor off for an accurate reading the pressure gauge (much easier to do from the hose-end). I am thinking of modifying mine to use a clip-on fitting and using my existing pressure gauge that I trust the readings from...
Are the gauges accurate? I have never had any luck with the in line gauges, always use a seperate gauge
 

Batts88

Well-Known Member
#12
I use liquid filled gauges $20 - $30 each more accurate and stay accurate for longer I replaced the one the air gun which was 3 - 4 psi out and also done the kwiky tyre deflator.

Are you able to mount the compressor in behind one of the rear side panels with some minor mods like adding a stable base to mount it to then you could have the ON/Off switch there as well.

You could also look at having some air outlets outside the vehicle I have one in front and one at the rear I have done that to my last 2 vehicles.
 
Last edited:

CB23

New Member
#13
Why do you need a switch at the end of the hose, doesn't the compressor have a pressure switch?
Yes as silveredition said the gauge reeds incorrect (high) when pumping, so the only way to pump up to desired pressure is to get initial pressure reading first then add the difference when you turn the compressor on. Would be much easier to be able to turn off and check without walking back and forth from compressor. Plus I like to turn compressor off when changing wheels.... quieter and lets the compressor cool a bit.
 

Albynsw

Well-Known Member
#14
Yes as silveredition said the gauge reeds incorrect (high) when pumping, so the only way to pump up to desired pressure is to get initial pressure reading first then add the difference when you turn the compressor on. Would be much easier to be able to turn off and check without walking back and forth from compressor. Plus I like to turn compressor off when changing wheels.... quieter and lets the compressor cool a bit.
Why do you have to keep walking back to the compressor between tyres, doesn't it have a pressure switch to turn itself off?
If not and you have already bought the compressor you could fit one up, it would be better than running a cable and switch
 

Mr Rum

4x4 Earth Legend
#15
Why do you have to keep walking back to the compressor between tyres, doesn't it have a pressure switch to turn itself off?
I could be wrong, but I’m pretty sure this is what my brother has, and I could also be wrong about other parts of this post, but below is my understanding/opinion..

The supplied hose just has a screw on fitting (as in it screws onto the valve stem), and doesn’t have any way to cut off the flow of air when it’s removed from a tyre. So I’m pretty sure you have to switch off the power to remove it from one tyre and attach it to the next.
You also have switch it off to get an “accurate” reading on the gauge. You can’t just lift your thumb off a valve like with most set ups, get your reading, then open the valve again to add more air.
Then if you put too much in, there’s no easy way to let it back out again, so you’d have to unscrew the fitting and use something else.

I’ll apologise now in case this upsets anyone, but I personally think they’re rubbish.

If you were to add a pressure switch (assuming they don’t have one, not sure with this point), cut the end off the hose and replace the screw on fitting with a snap connector, and buy a decent gauge, then maybe, just maybe, they’d be worth considering.

The only thing they have going for them is their litres per minute, and they’d want to pump a lot of air given their size.
Even then, my little single piston ARB set up takes me less time to air up, than my brother takes with his, so I’m not sure that it’s really that big of a plus anyway.
 

Albynsw

Well-Known Member
#16
I could be wrong, but I’m pretty sure this is what my brother has, and I could also be wrong about other parts of this post, but below is my understanding/opinion..

The supplied hose just has a screw on fitting (as in it screws onto the valve stem), and doesn’t have any way to cut off the flow of air when it’s removed from a tyre. So I’m pretty sure you have to switch off the power to remove it from one tyre and attach it to the next.
You also have switch it off to get an “accurate” reading on the gauge. You can’t just lift your thumb off a valve like with most set ups, get your reading, then open the valve again to add more air.
Then if you put too much in, there’s no easy way to let it back out again, so you’d have to unscrew the fitting and use something else.

I’ll apologise now in case this upsets anyone, but I personally think they’re rubbish.

If you were to add a pressure switch (assuming they don’t have one, not sure with this point), cut the end off the hose and replace the screw on fitting with a snap connector, and buy a decent gauge, then maybe, just maybe, they’d be worth considering.

The only thing they have going for them is their litres per minute, and they’d want to pump a lot of air given their size.
Even then, my little single piston ARB set up takes me less time to air up, than my brother takes with his, so I’m not sure that it’s really that big of a plus anyway.
I had the single piston ARB unit like yours and sold it with my Hilux as it was plumbed up to my lockers.
When I looked at replacement options for my cruiser I had a bit of a look at these cheaper ones but by the time you add a pressure switch if they don't have one and replace the cheap crap hose supplied the price difference to a quality unit is bugger all and the big turnoff was the bulky size and weight of them and massive amp draw.
I ended up getting the ARB twin unit and fitted it under the tray with nitto fittings either side of the vehicle at the headboard
One aspect I really like about the twin is that it is two singles plumbed together with a manifold but individually wired up so if one of the pumps shits itself you still have a single unit.
 

CB23

New Member
#17
Yes that's correct, pressure switch could be installed but then you couldn't get an accurate reading from in line gauge. I generally just inflate to approximate pressure then check with a separate gauge after if necessary.
Simple and cheap mod to run a 2 core cable and switch in series, and will therefore make the $80 compressor operate perfect for my needs. ARB certainly looks the goods, but I went cheap on this part due to needing money for other mods... when /if it fails in a couple of years I may get the ARB quality item.
 
Last edited:
Top