Outer Limits 4x4 Board

How long can or should you run an ARB compressor for befor letting it cool down.
I had a flat on the weekend and it must have taken like 10, 15 minutes to pump up.
The compressor was so hot the hose felt like it was going to melt.

Catn answer your question but have mine hot enough that you couldnt hold onto the snap on connector on the filler hose.

I have had mine so hot that it tripped the thermal overload. Just let it cool for a while and then it was fine again.

turps wrote:Catn answer your question but have mine hot enough that you couldnt hold onto the snap on connector on the filler hose.

same here... did 8x 33x12's

bogged wrote:

turps wrote:Catn answer your question but have mine hot enough that you couldnt hold onto the snap on connector on the filler hose.

same here... did 8x 33x12's

I got through 4x Q78s and 3x 35x12.5s before it shut off...only had one tyre to go and we could have been on our way GRRR

I didn't think ARB compressor's had thermal overload.

This is interesting! According to the specs I have the ARB compressor doesn't have a thermal cut-out, and when I stripped mine to give it a clean I didin't spot anything which looked like one.

On temperatures: very few people can hold 50 degrees C - most give up around 40-45 Deg. So "too hot to touch" isn't necessarily hot in terms of materials involved - barely 30 degrees above a nominal 20 degree "room temperature."

Mine takes WAYYYY too long to pump my tyres from 20 to 38 psi - but I haven't had it cut out since I fixed a leaking hose coupler. FWIW, mine sits under the bonnet, so I'm always pump tyres up with the bonnet up, and normally with the motor running - even though its connected to my second battery.

Cheers,

Scott

No thermal overload cutout is dodgey I reckon.

How have other peoples cutv out and then worked again later.

Has anyone here destroyed one by running it for too long,.

So are you saying your's has cut out before Scott?
What makes it cut out.

I have no idea. It cut out one day, not long after I had it installed. It would cut in and out every few minutes, until I discovered a leaking hose fitting and (sort of) sealed it with electrical tape.

Since I've paid more attention to fittings I've never had it cut out since, but I did notice that the specs don't mention a cutout, and I certainly didn't see one when I stripped it down to clean it out (long story - no fault of the pump, just the dickhead who owns it. )

I'm wondering if its an "undocumented feature" - there's a primitive cutout in there (somewhere?), but they don't tell you about it because the don't want you to rely on it? Perhaps somebody should contact ARB for the ultimate answer?

Cheers,

Scott

they probably have for warrenty or fire risk maybe? ino the bigger one that supercheap produces, has a thermal cut out, but still managed to cook the motor

i've cooked 2 arb compressors
they are shit ... they melt the lil rubber bits on the inside
easy to fix tho

how long were they running for?

pumping up 4 35" MTRs 15psi to 35psi

NJ SWB wrote:This is interesting! According to the specs I have the ARB compressor doesn't have a thermal cut-out, and when I stripped mine to give it a clean I didin't spot anything which looked like one.

On temperatures: very few people can hold 50 degrees C - most give up around 40-45 Deg. So "too hot to touch" isn't necessarily hot in terms of materials involved - barely 30 degrees above a nominal 20 degree "room temperature."

Mine takes WAYYYY too long to pump my tyres from 20 to 38 psi - but I haven't had it cut out since I fixed a leaking hose coupler. FWIW, mine sits under the bonnet, so I'm always pump tyres up with the bonnet up, and normally with the motor running - even though its connected to my second battery.

Cheers,

Scott

It may not have one, I just assumed it did cos of the way it behaved.

i have had mine cut out pumpin up 35's.....................you may find the motor has a built in thermal cutout................most eletrical motors do....................

Silly question but you do jack up the car to take the weight off the tyre to make it easyer on any compressor you use?

Tidy42 wrote:Silly question but you do jack up the car to take the weight off the tyre to make it easyer on any compressor you use?

too much effort..........for me thats a no

35psi is 35psi whether its on or off the car

MUSS wrote:35psi is 35psi whether its on or off the car

Exactly!

i only use mine to run lockers, its too slow for airing up tyres, i use a bushranger max air for tyres, it craps all over the arb, but even it runs hot

35 psi in a 35' tyre is pretty high, isn't it???

35 in a 35 is good.
larger profile the tyre the more sidewall flex therfore the more prone to edge wear. Pump em up harder and you reduce the tyre flex on corners and extend life.

Tidy42 wrote:Silly question but you do jack up the car to take the weight off the tyre to make it easyer on any compressor you use?

it doesn't make any significant difference. If you don't believe me, connect a pressure gauge to your tyre and read the pressure, then jack it up and read the pressure again. you need a pretty good gauge to see the difference.


as to the ARB compressor shizzle, the old ones (up to about 1997 - 98 I think?) have a thermal overload switch. ARB claims that the compressor has been improved and is now continuously rated. I think the price of them has also come down (?) - so I'm sceptical of the improved performance. they don't have any cooling other than the ribs in the extruded cylinder casing, and they do get pretty hot - I wouldn't be surprised if they melted the poppet valves etc.

cheers

Brian

dumbdunce wrote:as to the ARB compressor shizzle, the old ones (up to about 1997 - 98 I think?) have a thermal overload switch.

I have also heard that the older models have a thermal cutout but the new ones do not.

The specs say "45 min @ 45 degC". So I guess it will run longer at lower temps. Either way I have had no probs with mine. Mine is the toolbox one with the pressure cutout switch. It gets too hot to pack it all away after more than a few minutes use though.

bruiser wrote:35 in a 35 is good.
larger profile the tyre the more sidewall flex therfore the more prone to edge wear. Pump em up harder and you reduce the tyre flex on corners and extend life.

would have thought 35psi would wear the center of the tread.
i don't have 35's though, but run 24psi in 32'extreme trekkers.
seems to go ok.

With radials you can get shoulder scalloping from over inflating, rather than the centre wearing out. Discovered that with my old H/T tyres when I was running up near 40PSI in them.

http://www.tyremaster.com.au/tyre_care_ ... ssures.htm

45 mins running and then 45 min cooling is what i was told