AndyS wrote:OK, I know I set the standard when it comes to espresso pump snobbery...but this post of yours, Ken, just cracks me up.
Shoutout to vibe pump machine users: why do you let the manufacturers get away with crap like this? You obsess about the aesthetics of your machines, you pimp and polish your chrome-plated mirror-finish groups, you wrap the grinder in a towel so as not to wake up the wife at 6am...then you turn on the pump. It sounds like a sadistic dentist performing a root canal with a jackhammer!
Is it really that hard to design a vibe pump system with some sound deadening? Chris Nachtrieb, Terry Z, are you listening?
My vibe pump machine has been so heavily modified that I'm not sure I can even blame Cimbali on this. At the moment, there is a knockoff braided hose twice as long as from the factory, which goes out of the vibe pump into the rest of the plumbing, which itself has been modified. The OPV, which does not really function in the stock configuration, has been adjusted to work and has a silicone tube taking the excess water back to the pourover tank. All of the moving parts were replaced last year, and in the process the machine developed many leaks in the old copper fittings, which I tediously got rid of. The orientation of various pieces of copper is not exactly as it was before, but it works well.
I have done a few things to try to mitigate the noise and vibration, but nothing major, such as putting a rubber hose over the braided SS hose coming out of the pump. The reason why I have left everything in its current condition is that the changes unintentionally further damped out the pressure ramp up, as measured by a PF manometer. It takes a full 7 seconds to get up to 9 bar, and does it very very gradually, more than it did before. I consider this a plus, an accidental improvement, and am willing to put up with whatever occasional additional noise it produces. Considering that the machine operates maybe 1 week per month, and makes maybe 3-4 shots per day when it is working, the situation is not very distressing to me.