Join Date: Apr 2006
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Re: Westerbeke 40 Air FIlter or Air Silencer ?
I don't know your engine, but a number of marine diesels have no air filter, just a "silencer" that is supposed to channel the airflow so it reduces the noise and improves airflow efficiency a bit.
The logic is that since it is in the marine environment, there will be no dirt or dust in the air, so there's no need to filter it out, which restricts the airflow and engine performance.
If there are optional air filters available, you can do an oil analysis for about $25 to find out if there is excess silicon (coming from sand and dust grit normally) in your oil, which would indicate a filter could be useful.
If you take the "mushroom" off and the engine seems louder, you'll know why they still put a silencer on the intake.(G)