Key thing to take out of most of those tests you linked they apply to common rail direct injected diesels or direct injected not our Indirect Injected Diesels in general our stanadyne DB2 injection pumps / injectors / pre cups and pistons are a totally different breed in so many ways compared to say the cummins P pump / VE pump and direct injected diesels in general and those gens sets you refer to and 95% of the tests almost all were common rail or direct injected a common rail system runs on alot more pressure than ours and run on a fundamentally different principle ( direct injected vs indirect injected ) so most of those tests are null and void to us 6.9 / 7.3 idi owners.
our motors use a pre cup in the cylinder head to get our fuel burning and use velocity and a fairly straight stream hitting the bottom of the hot pre cup to flash our fuel into vapor ( hince why our glow plugs are in the pre cup directly inline of the injector and pre cup outlet to cylinder to allow vaporization of fuel when pre cup is cold aka motor is cold ) and this is also why timing our motors is so critical to advanced we melt the glow plugs inside the pre cup where it starts the burn and send metal fragments directly into our motor. The tests you linked are mainly common rail or direct injected setups and the few that aren't again use a totally different injection setup ( direct injected or common rail ) they mist the fuel at the injector itself out of multiple ports ( ours is a pretty well straight stream not mist ) directly above the piston and mixxes the air that way. The point is ours use a single port and a pretty straight stream into the hot pre cup and when it exits the pre cup as a vapor it goes into a special spot in our pistons called a ricardo cup where it starts a flame swirl from a vertical angle where it mixes the air ( direct injected do a horizontal rotation to mix air and fuel vapor and rely on the injector to do the vaporization unlike ours ) and the fuel vapor to make it burn so again those tests do not apply to our injectors or injection pump systems and fundamentally our IDI 6.9 / 7.3 motors.
This is why our engines are so good for biodiesel and alternative fuels like WMO ( waste Motor Oil / used hydraulic oil / used transmission fluid and such ) the hot pre cup setup and low pop pressure along with fairly straight stream into hot pre cup and single injector port and pure simplicity of design makes our engine in the top 5 for alternative fuels.
try to run a direct injected motor on waste motor oil or bio diesel higher blends they have alot of issues even if theyre not a common rail like say a cummins 12v 5.9l. The issue is the injection system mainly the injectors multiple small holes and reliance on the injector to vaporize the fuel our IDI pre cup motors are not prone to these issues because as long as our injectors do not dribble / leak and pop at a similar and acceptable pressure the hot pre cup is what vaporizes the fuel not the injectors in our motors and our injector ports are not prone to plugging due to large single hole and pintle design unlike common rail and direct injected diesels.
https://www.oilburners.net/posts/867681/ so you can see what i mean and how different our motors are compared to direct injected or common rail setups
Harry-Ricardo-based indirect-injection combustion system. Coined the "Comet" design, the proven induction swirl chamber in the engine's cylinders allowed for controlled, efficient, and manageable airflow.
our piston design indirect injected using pre cup and ricardo bowl
https://www.jegs.com/i/Clevite-MAHLE/695/2243508/10002/-1
direct injected typical piston
https://puredieselpower.com/dodge-p...mins-mahle-tapered-large-bowl-piston-kit.html
I am sure if you look at the piston design you can see the ignition of the fuel and how the engine fundamentally runs then look at those tests and look at them mainly being common rail or direct injected you can come to the conclusion those tests really do not apply for our 6.9 / 7.3 idi engines as ours are a totally different breed and run on very different principles.