walt_in_hawaii wrote:Stephen, I know you do machining too. Did you think of trying a very thin delrin ring, maybe split along a diagonal, to put in under the silicon rings to give them a little help pushing outwards more? sort of like a less messy 'wrapping Teflon tape around the piston' solution that I saw on the londinium forum.
I just ordered a set of Sorrento seals this morning, it was said that they are a little stiffer than the cafelat. I'll be careful swapping them, though, looks like I may have to keep my cafelats. But I hope Paul answers....
I honestly had zero problems with the Cafelat seals so no shimming was necessary at all. Lubricate them properly and they will be good for a very long time. If any stuttering is noticed then clean and lube, do not replace.
I thought about machining off the top of the piston to make it possible to put the 4th seal on with a washer as the top cap for the seal, just the way Bosco does it, but eventually came up with why mess with it. Removing that piston, and therefore the spring, is not an easy thing. I have the tools but thought it an exercise for the sake of liking work not for improving anything.
The only problem I had with the Londinium machine was a poorly centered spring to cylinder wall alignment making for a rubbing noise. Once I got the spring centered properly the machine worked as well as a commercial Lever can work. Bosco adds the 4th seal and has the different water flow path to the Group which accounts for some shot/temperature differences in the Group.
What pressure you are running in the L-I?