LarryM
Guru
- Joined
- Aug 5, 2011
- Messages
- 1,069
- Location
- USA
- Vessel Name
- Pelago
- Vessel Make
- Wellcraft 3300 Coastal
I just completed a major upgrade of my engine compartment which included new soft engine mounts, Soundown insulation on every interior surface, new hatch gasket and completely isolating the water lift muffler and exhaust piping with rubber mountings. It helped a lot, but during the process, I noticed that the intake tract was a major source of engine noise.
Now, I'm looking for ideas on how to silence that intake noise on my 56hp Yanmar 4JH3E diesel. It is equipped with a very basic pot-shaped air cleaner with a perforated screen (no foam) and a short snorkel. I have measured the intake noise with a meter and it is loud.
Installing/fabricating some sort of Intake Air Silencer has been mentioned in a number of posts, but no specifics have been offered.
Walker manufactures an AirSep for marine generators of up to 35KW which is supposed to reduce intake noise. It has sufficient air flow capacity for my Yanmar, but at $450, it is a bit pricy.
Cummins Fleetguard offer a number of plastic air filter/silencer assemblies that could be adapted fairly easily, but there are no specs as to what kind of sound reduction they might provide, only that the do quiet the intake tract.
I noticed some rather elaborate air filter/silencers on some recent Next-Gen marine generators. They use Kubota power and what looks like the Fleetguard filter or something similar.
I have found some references to silencing the intake noise on stationery diesel generators, but this was mostly limited to baffling the openings in the enclosures.
I ran across this post somewhere on the Internet that seemed right on point:
"On my Onan/4-cyl Kubota setup, I installed a Kubota tractor round type canister air cleaner. I then took the weather cap off the air intake and put a 1 inch silicone hose and 90 degree elbow that turns the air intake down towards the base of the generator. That pretty much eliminated the intake noise. The trick is to make 90 degree turns to trap the noise inside the intake pipe. Using a rubber hose such as silicone helps take the resonance out of the intake."
Some of the diesel pickup truck performance forums talk about removing the baffles in the intake tract to allow more noise, so I assume that some sort of baffling could be effective if properly done.
If anyone has any actual experience with sound attenuation of the intake noise produced by marine diesels, I would appreciate your comments or ideas. I'm sure all of us could benefit if there is a simple, effective solution to this particular issue.
OTOH, I don't want to experiment my life away on this, ear plugs are cheap . .
Larry
M/V Boomarang
Now, I'm looking for ideas on how to silence that intake noise on my 56hp Yanmar 4JH3E diesel. It is equipped with a very basic pot-shaped air cleaner with a perforated screen (no foam) and a short snorkel. I have measured the intake noise with a meter and it is loud.
Installing/fabricating some sort of Intake Air Silencer has been mentioned in a number of posts, but no specifics have been offered.
Walker manufactures an AirSep for marine generators of up to 35KW which is supposed to reduce intake noise. It has sufficient air flow capacity for my Yanmar, but at $450, it is a bit pricy.
Cummins Fleetguard offer a number of plastic air filter/silencer assemblies that could be adapted fairly easily, but there are no specs as to what kind of sound reduction they might provide, only that the do quiet the intake tract.
I noticed some rather elaborate air filter/silencers on some recent Next-Gen marine generators. They use Kubota power and what looks like the Fleetguard filter or something similar.
I have found some references to silencing the intake noise on stationery diesel generators, but this was mostly limited to baffling the openings in the enclosures.
I ran across this post somewhere on the Internet that seemed right on point:
"On my Onan/4-cyl Kubota setup, I installed a Kubota tractor round type canister air cleaner. I then took the weather cap off the air intake and put a 1 inch silicone hose and 90 degree elbow that turns the air intake down towards the base of the generator. That pretty much eliminated the intake noise. The trick is to make 90 degree turns to trap the noise inside the intake pipe. Using a rubber hose such as silicone helps take the resonance out of the intake."
Some of the diesel pickup truck performance forums talk about removing the baffles in the intake tract to allow more noise, so I assume that some sort of baffling could be effective if properly done.
If anyone has any actual experience with sound attenuation of the intake noise produced by marine diesels, I would appreciate your comments or ideas. I'm sure all of us could benefit if there is a simple, effective solution to this particular issue.
OTOH, I don't want to experiment my life away on this, ear plugs are cheap . .
Larry
M/V Boomarang