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A small gas engine makes a lot of noise. I have read that the better engines such as Honda are inherently more quiet than cheaper ones. My engine is a cheap one and therefore the results are more significant. I have a 1000 watt generator powered by a used 3 1/2 HP Briggs & Stratton engine which just screams at full load.
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www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=0...
www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=001RNA
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I don't know what's actually producing the noise, but there's a considerable amount. I guess it's the combo of bearings, valves, crankshaft, rod, lifters, and piston all added together that makes the noise. At any rate...I would highly recommend anyone make this mod to there small generator to help quiet it a bit.
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joelsgarage.blogspot.com/2006/03/quiet-generator-muffle...
joelsgarage.blogspot.com/2006/03/quiet-generator-muffler.html
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Honda Generators super quiet portable generator page with specs and features for eu1000i eu2000i eu3000is ex4500 and ex5500 ... This page features our selection of Honda's "super quiet" portable generator models. To be classified as "super quiet" the generator noise level must run under 64dB at full load.
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www.hayesequipment.com/honda/generators/honda_super_qui...
www.hayesequipment.com/honda/generators/honda_super_quiet_generators.htm
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IN addition to the noise, with the generator attached to the bumper, you will experience conducted vibration which may be louder than the radiated noise from a very quiet generator like the Honda. I strongly recommend that you trundle down to your local Radio Shack and buy yourself a db meter.
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yarchive.net/car/rv/generator_quiet.html
yarchive.net/car/rv/generator_quiet.html
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Quiet mufflers for small engines and generators. ... Jacks lists quiet mufflers to quiet the exhaust of large and small engines. Three types are available. Super TrappTM Mufflers are made to retrofit almost any engine. Also, there are quiet ... Quiet mufflers small engines muffler generator quiet muffler quiet generators.
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www.jackssmallengines.com/quietmuf_index.html
www.jackssmallengines.com/quietmuf_index.html
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From the beginning, quiet generators were designed with overhead valves, and have extra webbing in the crankcase to dampen vibrations. Some actually run at half speed to create less engine noise. But sometimes the companies that build the generator do use higher noise (db) mufflers to reduce the cost of the overall unit.
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www.jackssmallengines.com/tquiet_muffler.cfm
www.jackssmallengines.com/tquiet_muffler.cfm
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Generators designs with inverter technolgy enables the power equipment to operate at low noise, such quiet and silent generators such as Yamaha, Kipor and Honda generators operates at minimum noise. ... Engine: Quiet Inverter Generator...
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www.portable-generator.ws/quiet/index.htm
www.portable-generator.ws/quiet/index.htm
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technology to deliver high-quality electrical output in a compact, low-noise design. ... In 1998, Honda released its next-generation, ultra-quiet electrical generator series, the EU9i, EU24i, and EU28is (rated output: 900VA, 2.4kVA, and 2.8kVA respectively). These compact, lightweight generators employed original sine...
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www.thefreelibrary.com/Honda+Releases+the+New+EU55is+Ul...
www.thefreelibrary.com/Honda+Releases+the+New+EU55is+Ultra-Quiet+Generator+Equipped+with+...-a0155172478
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A full range of enclosed noise compliant generator sets; High fuel tank capacity; C330 D5 - New generation of enclosures; Reduction of sound over distance; Distance (m); At a distance of 7m away from the original source measurement point, the resultant noise level will be: 77-8 dB = 69dB(A)@7m;
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www.cumminspower.com/www/literature/brochures/NB001-Noi...
www.cumminspower.com/www/literature/brochures/NB001-NoiseCompliantGensets-en.pdf
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