Intake and/or exhaust excessive noise
I have a 1 cylinder Kubota EA 300 diesel engine what was originally sold as a bare engine, no radiator, fuel tank, or exhaust, to be combined with an assortment of other parts, placed in an aluminum box, to become an Aux Power Unit for an 18 wheeler, designed to provide heating, cooling and 120 volt outlets. The system had an approx 24 inch long muffler with approx 1 inch inlet and outlet installed outside the box. Intake air was obtained thru several 3/4 inch holes in the side of the box with a series of 3 filters 4 ½ x 4 ½ , one paper and two foam inside an air box which attached to a maybe 1 ½ inch rubber hose running to the engine intake.
All parts were removed from the box, tested, cleaned and replaced as necessary. Due to the new location, the box could not be used causing the parts to be installed in different locations. The engine was installed inside one compartment with the exhaust running out the bottom with new exhaust pipe but the original muffler. The original intake was used and obtains air thru the floor with the original filters, air box and rubber hose . The engine powers a small generator and runs at a constant speed of about 3,000 rpm or maybe a little more.
I didn’t realize this engine made so much noise until it was compared with other engines.
Some time ago, I found a web site that alleged that the majority of the noise of these engines produce was from the intake and suggested making a different air intake. Best that I can remember, they used a 1 ½ gallon plastic bucket, cut about a 2 inch hole in the bottom and top lid. Then they placed it full of foam rubber after cutting a hole in the center of the foam. A pipe was run thru the bucket after drilling holes the entire length of the pipe. Don’t remember size or number of holes or is it even stated that. A 90 degree elbow was placed on the top and bottom of the pipe after running it thru the bucket. I don’t remember if the pipe and elbows were pvc or metal and don’t remember if there was a space between the pipe and the foam.
The engine runs great, starts right up and all of the items work as intended. Could not be happier with its performance but sure would love to make it produce less noise. Any ideas or suggestions would be greatly appreciated. Thanks
I have a 1 cylinder Kubota EA 300 diesel engine what was originally sold as a bare engine, no radiator, fuel tank, or exhaust, to be combined with an assortment of other parts, placed in an aluminum box, to become an Aux Power Unit for an 18 wheeler, designed to provide heating, cooling and 120 volt outlets. The system had an approx 24 inch long muffler with approx 1 inch inlet and outlet installed outside the box. Intake air was obtained thru several 3/4 inch holes in the side of the box with a series of 3 filters 4 ½ x 4 ½ , one paper and two foam inside an air box which attached to a maybe 1 ½ inch rubber hose running to the engine intake.
All parts were removed from the box, tested, cleaned and replaced as necessary. Due to the new location, the box could not be used causing the parts to be installed in different locations. The engine was installed inside one compartment with the exhaust running out the bottom with new exhaust pipe but the original muffler. The original intake was used and obtains air thru the floor with the original filters, air box and rubber hose . The engine powers a small generator and runs at a constant speed of about 3,000 rpm or maybe a little more.
I didn’t realize this engine made so much noise until it was compared with other engines.
Some time ago, I found a web site that alleged that the majority of the noise of these engines produce was from the intake and suggested making a different air intake. Best that I can remember, they used a 1 ½ gallon plastic bucket, cut about a 2 inch hole in the bottom and top lid. Then they placed it full of foam rubber after cutting a hole in the center of the foam. A pipe was run thru the bucket after drilling holes the entire length of the pipe. Don’t remember size or number of holes or is it even stated that. A 90 degree elbow was placed on the top and bottom of the pipe after running it thru the bucket. I don’t remember if the pipe and elbows were pvc or metal and don’t remember if there was a space between the pipe and the foam.
The engine runs great, starts right up and all of the items work as intended. Could not be happier with its performance but sure would love to make it produce less noise. Any ideas or suggestions would be greatly appreciated. Thanks
