[kbinkster]

All the sound means is that the pressure is there. You can get the pressure, but not necessarily the heat. If you aren't getting the heat, you're just blowing air.

The M10 that GTT tested produced more heat than the M20. This is because the purity from the M20 was not so good. The pressure was there, but the purity was lacking, and the resulting heat was not as great from the M20 as from the M10.



If a 10 lpm machine can run the 'cuda at 60% (reports from guys running that torch on an Integra10), then a 20 lpm machine should be more than enough to power the 'cuda all the way. Yet, Brent, you yourself said that you run the M20's around 15 lpm (to get good purity?) or so and that is why you had two to power the Barracuda. You aren't even getting the full 20 lpm/each out of your units as it is. Why would retiring the M20 and putting in an M15 be a bad thing, then, if it runs at the full 15 lpm? It would stand to reason that if 10 lpm runs the torch at 60%, something putting out 16.7 lpm would get the torch to it's full power, or close to it. And, 15 psi is right in the middle of the 10-20 psi Beth recommends for running that torch.

I believe that a 15 psi/15 lpm unit that puts out a true 15 psi/15 lpm at good purity would be great for a Barracuda. Of course, a single unit that truely put out 20 psi/20 lpm at good purity would have been better - as it should have been enough to fully power the 'cuda.

And, if the M15 costs less than an M20, it would be a good choice for lots of lampworkers.

We'll see what happens...