| Author | Message | ||
| frank-id Posted From: 216.222.111.188 Rating: N/A |
I have mounted my Kohler 7KW under the floor of my Crown bus. Today I finished the install and fired up the unit. The unit runs great and easily powers 2 AC units of 13.5BTU. The gen set has no muffler, and the exhaust is really loud. The gen set turns just 1800 RPM, but the exhaust is loud. I have in the past tried may combinations of mufflers and tail pipes without a lot of noise reduction. Any know what reduces the exhaust noise with the least restriction to the engine. The unit is a Kohler 7KW, with a 2 cylinder gas engine, making 14 HP and has 58 cu in. I'm thinking some motorcycle muffler. Frank | ||
| Jack Conrad (Jackconrad)
Posted From: 207.30.189.38 Rating: N/A |
On our PowerTech with a 3 cylinder Kubota diesel engine, here is what we did. The generator is installed in the old AC condenser compartment. We ran a 2" exhaust pipe under the bus to just in front of the drive axle (about 15'), a 90 degree sweep and one automotive type muffler (per PowerTech recommendation), and a short section of straight exhaust pipe to get the exhaust out frokm under the bus. The long section of 2" seems to act as a plenum chamber to absorb or at least soften the pulsations. We are very pleased with the overll exhust noise level. Barely audible when standing next to the exhaust. YMMV Hope this helps, Jack | ||
| gg04
Posted From: 68.159.218.180 Rating: N/A |
Hey Frank...long time...I have a noisy honda so quietened it down with a late model Triumph stock muffler from the cycle grave yard...have tried lots of other combinations but this one worked gg04 | ||
| Bob Greenwood Posted From: 65.150.44.106 Rating: N/A |
yes, mine has a mufler off a gold wing that was in the 'cycle graveyard | ||
| JW Smythe (Jwsmythe)
Posted From: 66.133.203.29 Rating: N/A |
Personally, I'd suggest trying a "Turbo" muffler. Not Turbo brand, but they style. Now for the history, or at least legend as I know it..  "Turbo" mufflers were designed by GM for the turbocharged Corvair. The high performance crowd started adopting them because they were good at making the car quiet, but still allowed plenty of airflow. The general design is what most cars use today. For a 14hp 58ci engine, one should work great. For most cars, you have to worry about too much restriction, which is why you find one that allows for more airflow. A single regular "turbo" muffler is fine for a 200hp 350ci engine. Most car parts places have some sitting on the shelf in the common area, instead of needing to ask for it at the parts counter. Just match it up to your exhaust pipe size, so you don't have to convert it. It should put away happily, like a small import car. Muffler placement is important. To make the sound as quiet as possible, put the muffler as close as you can to the end of your exhaust system. Putting it closer to the engine with a long pipe leading to the exhaust tip improves the resonating tone, but since you're looking for quiet and not cool tone, you don't want that. What you could also do, should you decide to, is put a muffler close to the engine (generator), and then another very close to the end of the pipe. I wouldn't worry about restricting the exhaust flow with such a small engine, and it will probably make the sound quieter for you. I wouldn't think it would be necessary. | ||
| Bob Belter
Posted From: 24.6.14.247 Rating: N/A |
Ahoy, Frank, On my 12 kw genset, I use two each Kragen oval (1.5" pipe size) mufflers in series, plus one Kragen glaspac as the last item. Virtually silent. Cost -- about $75.00 One concern is that they may soot - up, because they don't get that much heat. Only about 75 hours on the system so far, but no problems. Enjoy /s/ Bob |