AndyS wrote:Although vibe pump do come up to pressure more slowly than rotaries, many people (even Ken Fox, IIRC), report that some sort of pump-delay preinfusion is still necessary for best results.
Where did I say that? I do believe that pump-delay preinfusion is helpful in rotary machines that would otherwise go directly to 9 bar without any sort of pressure ramp up, especially if one updoses. I never advocated any sort of pump delay on vibe machines. It was when I bought a new rotary machine that I noticed that it was not forgiving of updosed baskets (I had been updosing for years without even realizing it) whereas the vibe pump machine never gave me any problems with that, presumably due to its "built in preinfusion."
AndyS wrote: Once you start modifying your machine with aftermarket pump delay relays, you no longer are dealing with a "$30 vibe pump."
why would anyone do THAT?
Profiling pumps can do what your delay relay does and more.
the only thing missing is any sort of proof that this sort of modification produces "better" shots than does an unmodified vibe pump.
Not to mention the fact that if I had to listen to a stupid vibe pump rattling the glasses in my kitchen cabinets every morning, I'd probably give up espresso and stick with drip.
If I am not incorrect, the rotary pump in the Speedster is "outboarded." Dan has previously illustrated, in another thread, that "outboarding" a vibe pump eliminates most or all of the noise that comes from this sort of pump.