You are reading a single comment by @Stevethecoffee and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@Stevethecoffee
I'm glad you asked... The groups are fully mechanical. When you turn the handle (it goes a quarter turn to the right) it seals the exhaust valve and activates the pump via a microswitch. Turn it off and the exhaust valve opens and relieves the residual pressure. On most machines this is handled by an electrical solenoid valve - i prefer mechanical things to electrical ones.
There is no facility for preinfusion, its just on or off. It has 53mm portafilters which give a deeper coffee bed, I've always been a fan of that. The steam wands just move fore and aft which is a bit archaic, i might be tempted to fit later model ball jointed valves. Those are brand new wands in the pic, you bend them to the shape you want which I've now done. They're fine, you just need to remember not to yank them sideways.
