[gu_2.8]

After some help with understanding the difference between a single and twin cylinder compressors.

The two I am comparing are the XTM from BCF/SCA and the Projecta Typhoon from Anaconda.

Their current draws, duty cycles and max psi are the same and the XTM puts out 160LPM vs 150 for the Typhoon. The only unknown variable is the cylinder diameter. The XTM one is 60mm, however the typhoon does not give specs on this.

Now my understanding is that because the flow rates are nearly the same they will displace a similar volume of air per min. This would mean that the single cylinder compressor would have to work twice as hard to displace roughly the same volume of air per min. If this is the case then it would naturally run hotter, hence affecting its duty cycle. They have the same duty cycle however.

These are the compressors in question:

P.S. don’t even get me started on the Ridge Ryder vs XTM single compressors. Exactly the same specs, even look the same, yet $99 vs $275. Go figure.




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[Richie-Rich]

I had a projecta for years.

Was good. I went to “repair” it and it never worked again. I think I shorted something.

I bought a kings next. Looks and I suspect is the same as the XTM. Was faster than the projecta, same tyres same car etc. The fittings let me down and had me begging people in a random spot for some air. Once I fixed that it worked for 3 years pretty faultlessly. Then on a trip it just randomly died. Left me without air.

Now an arb twin with decent wiring is used. Very fast but silly $$ and prone to problems so I hear.

Rich


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[Laurie 42td]

I've got a Bushranger Max air or something. Had it for over 10 years with no issues. All I've done is replaced the coiled hose with an ARB one
Paid 400 bucks for it though.

 

[Overboard]

It makes no difference whether a manufacturer chooses to use a single cylinder format or a twin cylinder format, just work out what capacity you want and go from there.

 

[gu_2.8]

I've got a Bushranger Max air or something. Had it for over 10 years with no issues. All I've done is replaced the coiled hose with an ARB one
Paid 400 bucks for it though.

I have seen numerous comments about the bushranger compressors living for years. Saw one post on another 4x4 forum where a guy said his was 18 years old.


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[Softy]

If one of the cylinders on a twin dies will it keep running on one to get the job done?

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[Boundry Rider]

I’d be reluctant purchasing a twin comp unless it’s a big dollar item. Twice as many bits to wear out, like a V6 engine double the potential issues for little gain.
I bought a Goanna (made by Thomas USA) for $400 in 2003 and it’s still slowly blowing up my 35”Toyos fine and I haven’t even touched the air filter on the poor thing lol
Now if I had the $ back then I would have bought a twin Goanna, from memory they were another $199 up from my single.

 

[geeyoutoo]

I bought one of these several years ago, magic pump, single cylinder. If you buy a good pump you don't need to worry about failure, this one isn't the most expensive but it is a top pump and to me, very good value for money. Did a vid on it's performance in My Channel, link to vids in my signature, may be worth a look, costs you nothing .

https://www.outbackequipment.com.au/product/dr-air-aircompressor-150l-pmin

 

[gu_2.8]

I bought one of these several years ago, magic pump, single cylinder. If you buy a good pump you don't need to worry about failure, this one isn't the most expensive but it is a top pump and to me, very good value for money. Did a vid on it's performance in My Channel, link to vids in my signature, may be worth a look, costs you nothing .

https://www.outbackequipment.com.au/product/dr-air-aircompressor-150l-pmin

I will do. Thanks.


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[Overboard]

If one of the cylinders on a twin dies will it keep running on one to get the job done?

That depends what goes wrong. A faulty valve on one cylinder is not going to hurt the output of the other cylinder but seize one of them and you are stuffed.

 

[Boundry Rider]

Actually mine is a blue tongue lol

 

[JFF45]

I grabbed one of the 4wdSupacentre Thumper Max twin piston compressors just before the Lorella trip. They were on sale for $89.

Heavy bugger but they don't take long to air up. I figure that a compressor that runs less should last longer..

 

[Leethal]

Logic to me suggests that given you can't create or destroy energy, you can only change its form...

If a motor has an output of X amount of torque, it can either put out 150lpm from one cylinder... Or 75lpm from each of two cylinders for the same current draw.

Twin cylinders aren't going to have the output of a pair of single cylinder compressors, because a pair of compressors has a pair of motors.

Simplesness.

Marketing hype aimed at folks, um, prone to buying such tales...

If they're the same price, sure weigh up the pros and cons;

Twin: half the wear and stress, twice the parts to stuff up and konk out.

Single: double the wear on piston, seals and bore, half the parts to wear out.

Just go for whichever you get a good deal on, like John's example above, bargain.

 

[gu_2.8]

Logic to me suggests that given you can't create or destroy energy, you can only change its form...



If a motor has an output of X amount of torque, it can either put out 150lpm from one cylinder... Or 75lpm from each of two cylinders for the same current draw.



Twin cylinders aren't going to have the output of a pair of single cylinder compressors, because a pair of compressors has a pair of motors.



Simplesness.



Marketing hype aimed at folks, um, prone to buying such tales...



If they're the same price, sure weigh up the pros and cons;



Twin: half the wear and stress, twice the parts to stuff up and konk out.



Single: double the wear on piston, seals and bore, half the parts to wear out.



Just go for whichever you get a good deal on, like John's example above, bargain.

I like to do my research before making a purchase especially when the item has a few variants.

Based on your comment and the addition of a couple of other forum members I think I’ll settle for the $99 XTM single pumper.

Thank you all for your input.


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[Haggie]

I have a single cylinder jobbie. Pumps up 315 tires in no time. The outlet does get hot.

Cannot remembered what I paid (maybe $125?) but it came from aldi and looks just like all the other single compressors on the market.

 

[RickGQ]

I got a single cylinder Thumper from Superstore about 3 years ago. Used it a few times and it works very well. Aired up my 265/75's from 12psi to 20psi in no time at all. Gets a bit hot. If I used a compressor on a regular basis then maybe I'd get something more expensive but meh this one is ok for the occasional user like me.

 

[62woollybugger]

I had a twin cylinder ebay one for a few years, did the job but got very hot. I burnt myself on it a couple of times & had to wait ages for it to cool down enough to pack it away.
I've now got an ARB one, mounted upside down next to my rear draws. It's been there for quite a few years & never missed a beat pumping up my 285/75s from 20 to 40lbs every few weeks. On a couple of occasions I did other peoples tyres as well, so 8 tyres without a problem.
Do the cheaper ones have a flow rating at pressure? The ARB is 75L/m at 0psi, but only drops to 64.6L/m at 29psi.:cheers:

 

[gu_2.8]

I had a twin cylinder ebay one for a few years, did the job but got very hot. I burnt myself on it a couple of times & had to wait ages for it to cool down enough to pack it away.
I've now got an ARB one, mounted upside down next to my rear draws. It's been there for quite a few years & never missed a beat pumping up my 285/75s from 20 to 40lbs every few weeks. On a couple of occasions I did other peoples tyres as well, so 8 tyres without a problem.
Do the cheaper ones have a flow rating at pressure? The ARB is 75L/m at 0psi, but only drops to 64.6L/m at 29psi.:cheers:

Most don’t seem to give flow rate at pressure. That would help with price/quality comparison against the higher quality comps.


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[62woollybugger]

The cheapie did the job OK, it was just trying to find somewhere to put it afterwards so that nothing got burnt is why I put the ARB one in.
If you get a portable one, get one with a black cylinder, it will dissipate the heat much better than the shiny silver ones. :cheers:

 

[patrol dude]

I’d be reluctant purchasing a twin comp unless it’s a big dollar item. Twice as many bits to wear out, like a V6 engine double the potential issues for little gain.
I bought a Goanna (made by Thomas USA) for $400 in 2003 and it’s still slowly blowing up my 35”Toyos fine and I haven’t even touched the air filter on the poor thing lol
Now if I had the $ back then I would have bought a twin Goanna, from memory they were another $199 up from my single.

Spot on mate, bought my Blue Tounge Twin compressor (Thomas USA) over 18 years ago and have never had it out of the vehicle ever to be serviced. Bolted it up where the radiator overflow bottle was located on the passenger side. I just replaced the original breathers last year because the Aircon repair guy lent on them and broke one!! It has pumped up a gazillion tyres in that time as lots of guys never had one in the early days, and it wasn't unusual to pump up the tyres on half a dozen rigs prior to hitting the bitumen to head home. It was also connected up to my front locker via a 2Ltr air tank under my drivers seat for that whole time, till just a few months ago when I bought the small ARB compressor for the locker. If you look close in the pic, you can see the round black top of it just behind the Twin Tounge.

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