Rossynant
Well-Known Member
For an hour or close, 90% of max load, continuous load revs; assuming the prop is set as usually.
Diesel engines
- Thread starter ghostlymoron
- Start date
LittleSister
Well-Known Member
The other side to it is the peripherals.
The electrics live in damp salty conditions, with little of the through draught you get in a car engine bay.
The cooling system (unless keel-cooled) is pumping sea water, with plenty of particles, weed and creatures in it. Not kind to pumps, and susceptible to clogging. If you have indirect cooling there's heat exchanger, that will need occasional attention. If you have direct cooling you will have seawater running through the engine, rather than nice clean, del-ionised water with anti-freeze and corrosion inhibitors, and likely to result in corrosion.
The dry exhaust of a car is a fire risk in a boat, so most will have water injected exhausts. The combination of great heat and seawater at the elbow will result in corrosion and scale. The risk of seawater getting back into the engine can be catastrophic and needs to be guarded against. As many engines, particularly on small boats, will be below the waterline, adds challenges and increases risks.
Having said all that, if you look at the life of boat engines in terms of years of use/abuse, rather than hours run, they usually do very well, all things considered.
The electrics live in damp salty conditions, with little of the through draught you get in a car engine bay.
The cooling system (unless keel-cooled) is pumping sea water, with plenty of particles, weed and creatures in it. Not kind to pumps, and susceptible to clogging. If you have indirect cooling there's heat exchanger, that will need occasional attention. If you have direct cooling you will have seawater running through the engine, rather than nice clean, del-ionised water with anti-freeze and corrosion inhibitors, and likely to result in corrosion.
The dry exhaust of a car is a fire risk in a boat, so most will have water injected exhausts. The combination of great heat and seawater at the elbow will result in corrosion and scale. The risk of seawater getting back into the engine can be catastrophic and needs to be guarded against. As many engines, particularly on small boats, will be below the waterline, adds challenges and increases risks.
Having said all that, if you look at the life of boat engines in terms of years of use/abuse, rather than hours run, they usually do very well, all things considered.