in case you use a 130 zirri, I would say your output is reasonably good. but according to zirri advertisment not, didn't they sell this with 20 ps :grins: my suggestion would be that you should try to use the zirri potential: REVS. To my knowledge those zylinders may look like polinis, but are eurocilindro derivates. this would require different components than you use currently. oli p.s.: i don't want to disappoint you, but i have never heard of a good powerful 130 zirri, maybe you can build the first