what you really need to find out is how is the manufacturer handling the ECU and systems diagnosis?
Some like I believe Cat and maybe Volvo
are acting like Apple, that is no third part diagnostic equipment
is allowed as they keep their code proprietary, and unless I’m mistaken you can’t even carry a spare ECU as it MUST be programmed by the factory proprietary diagnostic tool before it can be used, and they will NOT program one except to put it on an engine
, so no spares.
Contrast that to the GM / Isuzu Duramax engine that software
and cod was released almost immediately which allowed all kind of programming and monitoring allowed, and I mean you could monitor
everything fuel pressures, temps, air density, temps you name it, way more than a dozen parameters. This was gold when you were troubleshooting as you knew a sensor was bad if it said the air temp was 300F or -50F etc.
So find out if the engine your looking at if the manufacturer controls the code and diagnostic equipment or are you allowed to monitor
it through third party software
The only real advantage of common rail is two fold, first the NVH or noise
vibration and harshness can be as smooth and quiet as a luxury cars gas motor
, and second is pollution control, a common rail can be a clean burning Diesel.
But unfortunately there is no big advantage in fuel burn.
Go listen to a modern Diesel engine pickup truck now, they are exceptionally quiet, and that’s because of common rail.
on edit, not necessarily relative to a sail boat motor
, but Common Rail can make huge amounts of power, it’s made Diesels into hot rods, and without Common Rail, Diesels would essentially dead as your not passing road emissions without it.
on this video, pay attention to the exhaust
, notice how clean it is. that’s Common rail and I’m sure Nitrous, but even nitrous won’t clean up smoke without advanced programming.
They are both the GM / Isuzu pickup truck motor, the Duramax