Join Date: Mar 2006
Location: New England
Thanked 18 Times in 14 Posts
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Diesel engines are also running at much higher compression ratios than gasoline. A gasoline engine may be running at 8:1 or so... As a rough method of comparison, you can think of it as if you have an engine with a displacement of two liters, it requires 16 liters of air to operate. A diesel engine is running at much higher compression ratios, typically 15–20:1, so a 2.0l diesel engine at 16:1 compression would require 32 liters of air, or twice as much air. At any given RPM, given two equal displacement engines, the diesel will generally require about twice as much air.
BTW, the higher compression ratios of diesel engines is part of the reason for their heavier weight, when compared to a gasoline engine of the same displacement. The engine has to be built heavier to withstand the higher forces.
It sounds like the cruising stuff for the kids is causing a restriction in the airflow through the locker. Personally, I think that the engine should be vented directly, not through a locker. Many boats have the engine vents under a coaming in the cockpit, so that water entry through the vents is minimized. On a C&C 38 I was on a while back, the vents were located in the helmsan's seat.
Not allowing the engine to breathe properly will result in a lot of different problems, that can result in expensive repairs. Carbon build up in the engine is only one symptom. It can also cause soot to buildup in the exhaust system...which can lead to back pressure issues...and so on... you really need to solve the situation properly now... rather than later IMHO.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Last edited by sailingdog; 11-11-2007 at 09:54 PM.