di gas engines

What is the average running temperature on a diesel marine engine?

Aug 22, 2009 by Man | Posted in Boats & Boating

What is the average running temperature on a diesel marine engine?
My Volvo TAMD engine's warning indicator lights up if the engine's water temperature goes above 175F, however it stays at 185f when running at full speed with the indicator light

Between 175 and 185f is normal, and the gauges are apt to be off some. If the engine is older it may need to have the cooling tubes boiled out, assuming you have changed the raw water pump and the entire system is in good shape. Check out this link.

mark t | Aug 22, 2009

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JJS Design Poland

A Polish fighter..

“I am from Poland and I’ll try to explain how the engine works. It is a bit complex. Basically it works as a 2 stroke – each cylinder delivers power once a turn of crankshaft. However the crankshaft and the crankcase are closed and lubricated normally with dry sump system as in 4 stroke engines. The X4 engine is combining the efficiency of a 2stroke engine and it has reduced pollution. Furthermore the engine has less vibration on high rpm than in lower rpm. It is using a special crank design.

The prototype of this engine is actually working – they have build a small, one cylinder 5cc engine to prove the design is good, and the small engine is fully operative. Now the are working on a 125cc version, and after that they will try to build the X4, 500cc, ~100 HP version. It will be equipped with direct fuel injection system.”

“I would like to add something. The basic design of the engine is similar to a big, marine, diesel engines. Those are also two stroke but they are lubricated in a normal way, as in 4 stroke engines. The main difference is that those big ship engines need to be supercharged to work. And the X4 engine has a special self-charging system. The air and the fuel mixture are pre-charged there and when the piston opens the port it rushes into the combustion chamber and the exhaust gases leave. Then the mixture is compressed, ignited by a spark plug etc.”

Source: Global Fighters

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