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So if anyone wants to do an OPV mod on their Classic, on mine one full turn of the OPV equates to about 2 bar of pressure.
The OPV on mine stubbornly refuses to turn.
Actually scrap that, I've never managed to get the hose off to undo the bolt that covers the OPV adjustment, which is hex type, right?
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I read you should aim for 10 bar?
Years ago I did adjust mine the old fashioned way of measuring flow, but have just got hold of a pressure gauge. It was up at 12.5 bar, dropped to 10 after three efforts (my OPV was extremely stubborn, even with a ring spanner added to the allen key for extra torque), and bam!, a massive improvement to the espresso.
If it helps anyone, when I get a mo, I’ll measure the amount of water dispensed from the group head in 30 seconds and post here.
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Howard
Sam
@Jonny69
Coffee machine service day. Strip and de-scale, backflush, thorough clean of other components, check and set pressure.
Puly Caff: woah, that stuff attacks coffee residue pretty aggressively. Everything is sparkling like new again. Amazing!
Pressure setting for this batch of coffee. I got my pressure gauge in the post, which simply screws to the bottom of the portafilter. 8 bar was still rushing through so I dropped it right down. It was pulling too slowly at 4 bar, but the shot was noticeably richer. I’ve left it in the middle at 6 bar, so I’ll find out in the morning when if I’ve got it dialed. So if anyone wants to do an OPV mod on their Classic, on mine one full turn of the OPV equates to about 2 bar of pressure.