Obviously cooler air is more oxygen rich, as is air with high moisture content.
I doubt very much that anyone short of an ocean going tug is going to notice the benefits of a few degrees cooler engine intake air, as you are traveling through a fluid medium all of your progress is relative to the mediums constant changing state.
As to benefits of warm air, i have worked on large diesel equipment
in sub zero temperatures and they are a bitch to get running when the intake air is cold. which is why we would have to resort to ether bombs to assist in starting the engine.
As a diesel is a Compression
ignition engine,it fires by compressing the air inside its cylinders until the oxygen ignites the fuel charge, hot intake air will aid in raising the combustion chamber charge.
As you have stated, to develop your maximum horsepower at a given RPM Cooler air will indeed provide more oxygen, but again because of the Fluid medium you are moving through
, the difference would be very marginal.
If the engine room was pulling air from the gates of hell i could see your point. However.. as long as you have a fresh supply of clean air
to your engine spaces then air temperature in the normal range will do just fine.
"QUOTE=Dockhead;906626]Well . . my boat's engine has a turbo and seawater-cooled intercooler. It's not only for land.
Cooler air means denser air means more mass of air in the combustion chamber, which means a greater mass of fuel can be burned, for more maximum power.
Warm intake air is NOT of any benefit at all to a diesel engine -- it's all bad.
Someone said it only affects maximum power -- this is not true. It affects maximum power at any given RPM level. So with hot intake air, you may need more RPM to get your cruising speed power level you need. Like I said -- hot intake air is all bad. Although in most cases not worth making a big project
out of -- as Bob&Connie said.
My boat has multiple large ducts and blowers to keep fresh air moving through the (sealed and soundproof) engine space.[/QUOTE]