Coltri MCH6 compressors from Nuvair

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Jasonmc

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Mar 5, 2018
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IN, United States
I've been looking to upgrade to a different compressor for some time now and I keep going to the Coltri MCH6 compressors from Nuvair....the gas powered model. As I prefer the portability of it for my needs... does anyone here own one. As I would like to here your experiences with it. It's my understanding that parts can be easily bought here in the US also... any info would be much appreciated 


 
I recently bought the alkin w 31. It is a duty cycle compressor. The coltri is not. It was only $500 more than the coltri
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Got a link. I'll look at it too. What little I've seen of it. I think its offered in a gas also? Although this is for my personal use. Filling a tank (66cf) once, sometimes twice a weekend if someone is in need of air I let them use my tank.. i would think either would last quite awhile... kinda want to stay around the $2500ish mark... but hey if the other is better for 500 more its worth looking at.
 
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The MCH-6 is a four piston compressor and thus low stress and low maintenence.

The 230V mono phase (ie 230V to ground) is rated at 90liters/minute, the 400V/three phase / Petrol is rated at 100liters/minute.

And no where in the material from Coltri does it state that it is only for intermittend use and not for prolonged use!!!

https://www.coltri.com/en/products/portable-compressors/basic/



But please prove me wrong???
 
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We use a Coltri MCH-6, the 220 electric model. We are very happy with it and it is very reliable. We would recommend one, based on our experience.

It looks like all 3 current major players in the compressor business have existed for some time. Bauer (1946), Coltri (1960’s), and Alkin (1990’s).

https://www.bauercomp.com/en

https://www.coltri.com/

https://www.alkinus.com/about

For us, the choice came down to known reliability vs. cost.
 
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duty cycle ,, quoting Ray, who sells coltri

https://www.airgunnation.com/topic/duty-cycle-on-compressors/#new-post

I am not going to comment on the Chinese toys since I can lose my insurance by getting involved in them. My comments below are about the Coltri or Bauer stock small compressors (not the Daystate which is Coltri made).

Duty cycle has to do with the compressor itself ... not the motor which has it's own duty rating. In order to take a continuous duty machine (can run 24 hours a day at max pressure) to intermittent duty, the manufacturers had to reduce crank and bearing size. This reduces size, weight and cost. Temperature plays a small part in the rating, but stress on the system is the key component. The small $2700 compressors can pump all day long one tank at a time to max pressure (4500 psi). As long as you are only filling one tank at a time, the maximum stress occurs only for a short time as the compressor gets up to 4500. However, if you hook up a bulk tank, you greatly extend the time that the compressor will be at the higher pressures and will slowly but surely be eating away at the crank shaft bearings and races as well as the piston pins. 

So, fill one tank at a time and you are golden. Fill a daisy chain of tanks or a bulk tanks or two and you will be calling me for repair parts sooner or later.

Ray Contreras - Owner CompressorStuff.com
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the coltri will serve you fine, the Bauer and Alkin are great also,,, I don't see a wrong choice with any of these. just remember the OP liked the gas engine option

I am a very happy Coltri owner, elec 220volt model
 
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The MCH-6 is a four piston compressor and thus low stress and low maintenence.

The 230V mono phase (ie 230V to ground) is rated at 90liters/minute, the 400V/three phase / Petrol is rated at 100liters/minute.

And no where in the material from Coltri does it state that it is only for intermittend use and not for prolonged use!!!

https://www.coltri.com/en/products/portable-compressors/basic/



But please prove me wrong???
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I talked to the sales rep from coltri many times on the phone he told me if I was going to refill my 97 cubic foot Great White Tank that I may need to rest the compressor and do it in stages, because it is not designed for prolonged duty cycle the Alcan on the other hand will run day and night nonstop it is a much heavier built and more durable machine. The Alcan also has an extra level of filtration and produces the highest quality of breathing air where are the coltri does not. this may not matter if your not filling scuba tanks but to me the absolute purest moisture free air is a necessity that's why I went with Alkin. The price difference was only $500 so at that point why not go with the best
 
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The Alkin is also the only one with a full two year warranty the coltri is one year and limited. Also the Alkin runs at a much lower RPM which is going to prolong the life of the unit. I don't think the coltri is a bad choice but if I'm spending that kind of money I want the best and I want it to last. The coltri top off time on my bottle are three times what the Alcan will do also the coltri will not fill to 4500 PSI. It is a 300 bar Max the Alkin on the other hand will fill to 5000 PSI (345 Bar)
 
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The MCH-6 is a four piston compressor and thus low stress and low maintenence.

The 230V mono phase (ie 230V to ground) is rated at 90liters/minute, the 400V/three phase / Petrol is rated at 100liters/minute.

And no where in the material from Coltri does it state that it is only for intermittend use and not for prolonged use!!!

https://www.coltri.com/en/products/portable-compressors/basic/



But please prove me wrong???
Click to expand...

I talked to the sales rep from coltri many times on the phone he told me if I was going to refill my 97 cubic foot Great White Tank that I may need to rest the compressor and do it in stages, because it is not designed for prolonged duty cycle the Alcan on the other hand will run day and night nonstop it is a much heavier built and more durable machine. The Alcan also has an extra level of filtration and produces the highest quality of breathing air where are the coltri does not. this may not matter if your not filling scuba tanks but to me the absolute purest moisture free air is a necessity that's why I went with Alkin. The price difference was only $500 so at that point why not go with the best
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That right there my friend is some good information .. Thank You 
 
Upvote 0
The MCH-6 is a four piston compressor and thus low stress and low maintenence.

The 230V mono phase (ie 230V to ground) is rated at 90liters/minute, the 400V/three phase / Petrol is rated at 100liters/minute.

And no where in the material from Coltri does it state that it is only for intermittend use and not for prolonged use!!!

https://www.coltri.com/en/products/portable-compressors/basic/



But please prove me wrong???
Click to expand...

I talked to the sales rep from coltri many times on the phone he told me if I was going to refill my 97 cubic foot Great White Tank that I may need to rest the compressor and do it in stages, because it is not designed for prolonged duty cycle the Alcan on the other hand will run day and night nonstop it is a much heavier built and more durable machine. The Alcan also has an extra level of filtration and produces the highest quality of breathing air where are the coltri does not. this may not matter if your not filling scuba tanks but to me the absolute purest moisture free air is a necessity that's why I went with Alkin. The price difference was only $500 so at that point why not go with the best
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It sounds like the rep that you talked to was describing the MCH3 which is a lower tier compressor when compared to the MCH6 or W31.

To fill a completely empty 97 cubic foot tank, according to the specs:

72 minutes - Coltri MCH3

28 minutes - Coltri MCH6 single phase

26 minutes - Alkin W31

23 minutes - Coltri MCH6 3 phase or gas

The MCH3 is 300bar and even that is pushing it. The MCH6 comes standard with a 310 bar relief valve, but can be ordered up to 330 bar. Mine came with a 330 bar relief valve, so no problem going all the way to 4500psi. I always do top offs and even complete fills in one session. I never felt the need to let the compressor rest to fill a single bottle.

The Alkin W31 (140 lbs) is heavier duty vs the Coltri MCH6 (90 lbs)
 
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Fully agree with the above 2 posts. The MCH6 is more than capable of filling large tanks without a "rest", and will do so to 4500 quickly without question. Plus the gas powered version is preferred by some. Not sure of the gas powered availability on the Alkin. Seems either compressor would probably do equally well for the possible needs of the vast majority of shooters who might buy either one.
 
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For individual users or small groups, the Coltri MCH6 is hard to beat as a portable compressor (< 100 lbs).

If you want a stationary compressor (> 200 lbs) that will be used continuously, then there are other Coltri compressors (MCH8, 11, 13, and 16). They are more suitable for a business that fills tanks all day long.

The Alkin W31 is somewhere in between.
 
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For individual users or small groups, the Coltri MCH6 is hard to beat as a portable compressor (< 100 lbs).

If you want a stationary compressor (> 200 lbs) that will be used continuously, then there are other Coltri compressors (MCH8, 11, 13, and 16). They are more suitable for a business that fills tanks all day long.

The Alkin W31 is somewhere in between.
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Excellent!
 
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I have a gas Mch-6 and I love it. I can fill an empty 88cf tank in about 20 minutes. Refills from 3k to 4.6k take about 5-6 minutes. 
As far as duty cycle goes, the dealer I talked to said to let it rest a bit and cool down after 2 straight hours of run time.
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Same here. I can take it anywhere or fill while power is out. Fast and reliable. Will it outlast the lifespan of most shooters? I'd say yes.
 
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