Pete, I am not saying that there will be NO torque and pressure fluctuations. But you have a long history of hyperbole on things that fall rather short of being cataclysmic.
Source: Richard van Basshuysen and Fred Schäfer (ed.).
Internal Combustion Engine Handbook - Basics, Components, Systems, and Perspectives. SAE International 2004.
In the above, the drive torque and pressure fluctuations are plotted. In the worst case, the torque fluctuation is about 15Nm peak-to-peak. All intermittent pumps and reciprocating devices are going to exhibit this behavior, and there is a simple solution for this: You put an inertial weight, like a flywheel sprocket.
With regard to pressure fluctuations, the worst case amounts to about +/- 0.01 kbar or 10 bar. With the mean at 1500 bar, that's 0.67%. Not the magnitude that will make a lick of discernable difference (especially when we're not only talking about one injection event but rather more commonly now up to 7 per cylinder per cycle over a wide span of crank angle).
And this data is on FIE that's at least 8 years old, based on the date of the book. There have been improvements made in succeeding generations.
Like I said, Pete, you have a long history of spouting out your opinion rather than well-established and accepted fact. So, I kindly challenge and invite you to post written proof from a credible third party (e.g. Bosch Automotive Handbook or similar, not some unknown, non-cited website or "expert individual") that unambiguously confirms your assertions. I've done my part.
