Thank you all for the information and advice, this is great stuff.
Thanks for that one. I came across it yesterday. Lots of information indeed.
TomC wrote:When it comes to commercial lever groups, I have a hard time elevating one too high over another. As long as they work, are easy to maintain, and don't squeak, I don't fixate on the finer details. The LSM group is pretty to look at with the visible spring. (...)
I took out the smaller inner spring on the Leva a few years ago and never looked back, so I don't see the double spring as a perk or even a necessity. I didn't like the shattered cups and mess of having a portafilter rocketing off and creating a cannon explosion level sound. Plus the shots are still great. You really have to have the portafilter locked in quite firmly with two springs in the group.
For me the point is to get that added power. I have used my Bezzi lever for a long time and operating it has become a second nature. Made some messes, replaced some bent piston rods after inadvertently pulling of a "jaw breaker" manoeuvre, etc. The LSM is a serious contender for me. Especially in light of this bit of knowledge I was lacking:
I think you need to make sure they fit. The Fiorenzato group is a dipper, so it would not fit as is. The LSM group may be easier, but needs this part:https://devecchigiuseppesrl.com/e-comme ... =8SM502022
You can modify the part to a thermosiphon by drilling and tapping. And you need to retrofit your machine pipes to attach to this piece.
Up until now one of the biggest difficulties has been to identify which double-spring groups would fit a thermosiphon. This bit is really helpful too:
MemPast wrote:I think the only group that fits your machine other than the bezzera group is the (Bosco?) group with thermosiphon. It is the one used by Londinium and Salvatore levers.
However I thought that the one used by Londinium is the same as the Fiorenzato Piazza San Marco lever group (and the same as the Bosco). I e-mailed Kees van der Westen. He didn't confirm which group was on the Idrocompresso. I just assumed it was the Fiorenzato/Londinium/Bosco. (This post: Bosco groups vs the rest
also seems to lump them together.) But he did say that these groups come in dipper and thermosiphon variants. Would make sense for the manufacturer from a commercial perspective once you've put in the engineering effort. But how to find the right one?
I don't know the Salvatore machines. Can you post a link?
MemPast wrote:A picture of the Bezzera group back may be helpful for the experienced folks here to offer advice.
Here is a picture of the back of my group next to the CMA (courtesy the Kafeewiki page linked to above).
(The one on the right obviously.)
Retrofitting the pipes to fit whatever thermosiphon connection of a new group would not be a problem. I know someone in my town who is good at making new pipes by hand.
I suppose sourcing will soon become the main question. An LSM plus connecting part is a serious contender. The "Londinium group" would be as well. The latter is not easy to find. That's too bad, as the esthetics please me more than the LSM's. (Functionally they appear interchangeable to me aside from the inlet valve solution on the LSM.) The Italian parts distributors like Vecchi don't have Londinium or Bosco parts listed. Would Londinium sell me one? Does anyone of you have suggestions?