Piston pressure gauge for Strietman CT1 - Page 14

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CwD

Postby CwD » Dec 23, 2017, 1:47 am

Finally got around to getting a lid for mine! Fits great, should help with retaining temperature (especially with my winter room temperature being so low) and keeping much from evaporating out.

Do already miss my analog thermometer clipped on the side. Might have to drill a small hole between the lever arm slot and gauge slot, or perhaps off to the right, to drop it in through. Not enough of a metalsmith to have cut the gauge hole myself, but I think I can manage drilling one for the thermometer :lol:

erik82

Postby erik82 » Dec 23, 2017, 4:06 am

I ordered a pressure kit yesterday complete with lid. More things to play with.

erik82

Postby erik82 » Dec 24, 2017, 5:39 am

Waiting for the invoice from Gabor I wanted to have a look at how much trouble I would have getting the pin out as I have a first batch CT-1 so it's been there for some while. Better to fix the problem in advance then having to wait longer putting the pressure kit on :mrgreen: . I have a lot of tools but am missing a blowtorch and I seem to really need one. It is pretty stuck and heating it on the flame of my stove for 2 minutes wasn't enough. It didn't go anywhere.

Well. I probably still have 1-2 weeks to get it out once and after that installing the pressure kit should be easy when it arrives. I'll contact a friend of mine with a lot of experience in restoring cars and bikes. He'll surely get the job done.

CwD

Postby CwD » Dec 24, 2017, 7:49 am

Got my pin out without heating at all by pushing it out with a gear puller I originally got for a bearing swap in my Jericho. Pretty inexpensive and easy to use.

erik82

Postby erik82 » Dec 24, 2017, 11:34 am

A gear puller also did the job here. We didn't need to heat everything up and where ready pretty quick. Cleaned everything up and put it back together. When the pressure kit arrives it should come out pretty easily.

I do think that pushing it out is the best way to get the rod out. Others can learn from our experiences. Another trick I got was to use a vise and a bolt with a nut or wooden block with a hole drilled in it. Then use the bolt and the vise to push the rod out. Use the nut or the wooden block with the hole on the other side where the rod is to get the clearance to push it out.

bas

Postby bas » Dec 25, 2017, 6:01 pm

clever solution!

have fun with your kit Erik. sure you will like it.

erik82

Postby erik82 » Dec 29, 2017, 1:09 pm

Here is another happy naked CT-1 owner. The kit came in today and installation was really easy. I took the piston out in the morning, pushed the pin out of the inner piston and drank pourover the whole day until the package arrived. The kit was then installed in 5 minutes. The lid is also very nice and I'm using it again when the CT-1 is on. Now it's time to get to play with exact pressure profiles.

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naked-portafilter
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Postby naked-portafilter » Apr 11, 2018, 1:01 pm

RyanP wrote:Anybody else notice a smaller volume output since changing out the pistons ? I used to be able to regularly pull a shot in the 37-42g range.. now I'm often only getting 30-32g. If I really wait with the lever raised I can get up to 34g. Usually 30-32 is perfect for the normale I tend to pull, but sometimes I like to stretch the ratio and I can't really understand what the reason is for the change in volume output.


Hey Ryan,

Any progress in the yields pls? Could you fix your issue with the volume?

Cheers

Gábor

RyanP

Postby RyanP » Apr 15, 2018, 5:32 pm

Hi Gabor,

I never managed to figure out what the problem is. I thought changing the seals made a difference at first, but I'm still routinely only able to pull upwards of 33-35g. Very often after holding the lever in raised position for preinfusion I'll bring down the lever and not meet resistance right away. I've tried raising the lever very slowly, holding it at points along its path up, or just holding at top for upwards of 15-20 seconds, but there's no consistency in the result. On occasion I am able to pull higher volume shots like before, upwards of 40g... but I have no idea why sometimes I can and other times not. I'm open to suggestions!

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naked-portafilter
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Postby naked-portafilter » Apr 15, 2018, 5:46 pm

Have you made a double check with the original piston pls? What happens if you feel the resistance and lift the lever back to the top position?