Quote:
Originally Posted by John Holbrook
Many modern diesels neeed turbos to make them perform. Is it feasible to turbo charge an outboard?
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Mercury years ago supercharged their Verado outboard to give it the bottom end of a two stroke, give it a strong holeshot.
It’s not a Diesel, but a supercharger would likely be better for an outboard, cause the
power from a supercharger is instant, where a turbo takes higher
RPM and there is a lag.
It’s emissions that will kill a Diesel outboard, it’s almost killed on road Diesels, they have become so complex, and with the fuel costing more than gas, there isn’t much point to a Diesel anymore.
In the US it’s extremely difficult to meet emissions with a Diesel, without cheating.
Technically it’s not cheating, manufacturers are allowed to disable emissions controls to protect the engine, and they get to determine when it needs protecting, so some define the need for protection being at
cruise RPM, or under acceleration, or normal operating temps.
All manufacturers have cheated and I’m sure still do, it goes back a long time, first cheating I remember was GM had the Cadillac so that anytime the
heater or Airconditioner was on, the emissions controls were switched off, knowing the emissions testing was done with the
HVAC systems off, and that was decades ago.