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Old 01-16-2016, 05:53 PM   #21
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According to Bob Smith at American Diesel the Airsep filter will reduce the noise coming from turbo charged diesels. There is no benefit to using an Airsep on a FL135.
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Old 01-16-2016, 06:21 PM   #22
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Welcome aboard, petdoc4u! Do you run Lehmans on your boat?
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Old 01-16-2016, 06:29 PM   #23
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Yes, a single 135
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Old 01-16-2016, 08:39 PM   #24
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Ummmm - whats an airsep and what does it do (or not)?
As the pistons go up and down in their cylinders, the total volume of the crankcase changes. Since there is often a mist or fog of oil in the crankcase, the crankcase vent can breathe in and out, exhaling oil in the process. That's one reason why many engine rooms smell like oil.

An AirSep is a filter that captures the oil in the air and returns it to the crankcase preventing oil in the engine room air. It also muffles the "breathing" sounds of an engine.

I tend to agree with the others that a good set of engine mounts would do far more to quieting down an engine (or two) than the crankcase vent noises.

I've not seen the alternatives to AirSep from Tony Athens, but have read his work and in my opinion he knows what he talks about.

If you have turbos, a bigger air filter with more surface area can cut down on some of the turbo whine. Just remember, when you hear them, they are not working... Under load, a turbo operates far above our ear's audible range.
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Old 01-16-2016, 09:21 PM   #25
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Originally Posted by stubones99 View Post
If you have turbos, a bigger air filter with more surface area can cut down on some of the turbo whine. Just remember, when you hear them, they are not working... Under load, a turbo operates far above our ear's audible range.
Not working, or not working at peak efficiency?
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Old 01-16-2016, 09:27 PM   #26
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If you can hear them, they are not doing much other than free spinning. That happens below about 25,000 RPM. Under load, they can go over 110,000 RPM...

Reminder, keep clean oil in them

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Old 01-18-2016, 04:45 PM   #27
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Maybe I'm missing something, but the crankcase breather line goes to the intake side of the turbo on my T6.354. This is a similar setup as I've seen on lots of cars too. Why not just do that to eliminate the oily mist in the engine room?
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Old 01-18-2016, 04:52 PM   #28
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Many perkins and older engines simply had a breather pipe down from the top of the crankcase.

What you're talking about on a car is called a PCV - Positive Crankcase Ventilation line and often it clipped into the air filter so that any escaping vapors were consumed.
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