Aero Tecnica Coltri MCH-6
- I've had my eye out for one of these and when I found it, I had to buy it. The 4 stage MCH-6 has been sold under different names and even private labeled to sell by other companies. One of the older renditions was the Olmeva 6000. This one of mine is an Aerotecnica Coltri MCH-6. The current model is a Coltri Sub MCH-6. Which is also sold under the names of MaxAir 35, Nuvair MCH-6, and others.
- This is my first gasoline engine powered compressor. It's also my first oil lubricated compressor (I have an electric powered RIX SA3 oil-less compressor). Anyway, I have some questions and concerns:
1. It appears to have been used quite a fair amount but has never had an extended air intake hose like other gasoline engine powered compressors. I have since seen other gas powered units pictured this way. The latest Coltri Sub operators manual talks about "positioning" the compressor for best ventilation. They do offer a remote air intake hose for situations where the compressor cannot be positioned to avoid the exhaust fumes. The guy I bought the "Aero" from says he and his buddies used it on their boat when diving in Lake Michigan. So, how common is it to use the gas powered compressor without an extension hose on the air intake?
2. The filter cartridge on this Aero was packed with nothing but charcoal. I replaced it with a Lawrence Factor pre-packed filter that is 2/3rds 13X Sieve for moisture absorption and the remaining space has hopcalite for CO and Charcoal for tastes and smells.
3. I positioned the Aero with the intake filter into the wind and the engine exhaust flowing downwind. I then pumped and emptied a tank 3 times. Drained the moisture accumulator and the filter spigots. And then checked the filter test strip. It was still solid blue. I then pumped the tank up once again and took it diving for about 45 minutes. I smelled nothing and tasted nothing. Seemed fine.
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