Excellent posts Dan and Gord.
Gord has made a very important point. Engines are "designed" for specific purposes. Now OK, in cheaper equipment
, it is often a case of some manufacturer simply buy's an engine and slaps it on their....Genset for instance. But the big gensets you are refering to Dan, are purpose built units designed for that very specific purpose and you pay top dollar for them. Even if the eninge is found on other equipment
, there are often subtile changes that have been carried out internaly. THis is why in some cases, parts
are not always
the same for the same engine model. There can be slight variances in certain key parts
. Now the one major difference you will note in those big gensets is that the engines are very long stroke slow lumbering powerhouses of engines. They have been desinged to run at a constant power and Rev range for most of their lives. However in saying that, when they do finaly come to the end of their lives, you will note that they have very specific wear signs within the engine that you would not see in and engine with a differing load/rev cycle.
However, all that aside, my main comment was refering to the pleasure boat market. These are engines that in some cases are just a modified vehicle engine and the marine
enviroment and the operation in that environment
doesn't often suit what the engine had originaly been designed for.