Hi,
I do not agree. I tried the hard lines out of the 60x engines without any difference.
These lines are smaller in diameter and my intention was to get better response of the pressure wave towards the nozzle. In my opinion compressibility of fuel and swelling of hard lines is there but recognisable only at extreme pressures > let’s say 500 bar. The CR stuff works with pressure ranges up to 1500 bar using huge volumes (rail) and identical hard lines, little shorter in length but same id and od.

More important for me is to start thinking at the nozzle. Even if there is more fuel at lower pop pressure this additional fuel will burn incomplete so there is no gain.

Restriction in fuel flow: The volume flowing is very small, then interrupted by closing of the nozzle. For me the accurate stop and go of the fuel column seems more important than just pumping fuel. There is a lower limit of pop pressure where the atomisation is too bad to get the car running well, never heard that turbos run better with na injectors but on the other hand that increasing pop pressure reduces smoke.

With our ip the amount of fuel is determined by the effective stroke of the plunger and the nozzle, set to a specific pop pressure, can only release the quantity coming from the ip. In theory: Run the ip without injector, just the hard line or even without delivery valve. The quantity is limited to the geometry of the element. The quantity being delivered out of the diameter of a hard line (theoretically huge nozzle) will not spray.
Garden hose with 3” id but the supply from the water pump remains the same.

The CR and gasser things work with a continuously pressurised system and the injectors determine the quantity for the injection. In this case bigger nozzles make sense but not in our system.

The delivery valves have an orifice to kill the back pressure wave when the nozzle closes and the IPs with 10mm elements have similar DVs. On top of this the C111 engine was not modified in injectors, hard lines and DV. Next thing they would have touched is the prechambers…

Just my thoughts, sorry for the long text.

Tom