Originally Posted by John Holbrook
Many modern diesels neeed turbos to make them perform. Is it feasible to turbo charge an outboard?
years ago supercharged their Verado outboard to give it the bottom end of a two stroke, give it a strong holeshot.
Itís 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.
Itís emissions that will kill a Diesel outboard, itís almost killed on road Diesels, they have become so complex, and with the fuel costing more than gas, there isnít much point to a Diesel anymore.
In the US itís extremely difficult to meet emissions with a Diesel, without cheating.
Technically itís 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 Iím 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.