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- Nov 29, 2009
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I used to have one of these hondas. The gx engines are pretty quiet. All you have to do is park it on the other side of a vehicle and you hardly hear it.
Why are outdoor power equipment engines so loud?
- Thread starter The motor guy
- Start date
In the 50's lawnboy made a quiet flite. Bigger 3 chamber under deck muffler, engine under a insulated hood, baffled intake and cooling air exhaust. The loudest noise was the blade hitting the grass, almost electric mower quiet. It was heavy. Wish I had not been a typical kid and tore it apart to use the engine on lighter mower. It would be worth some bucks now. Did use 16 to one oil, so here is silent mower with a smoke cloud coming out from under it. I love lawnboy.
Rod
Rod
2x and talking 100 yards away.
And grain dryers for miles.
There's a rail line several miles away and I can hear the trains lumber on through on a quiet wind free evening.
In simple terms a small engine is like a thin bell, along with the thin sheet metal attached to it in some cases. If you want them to be quiet it will need about 300 more pounds of material weight and like others say liquid cooling. But then it won't be a small OPE engine anymore. 
I'm 7 miles each way from the rail tacks and sometimes you can hear them if the wind is blowing my way. Use to be able to hear the whining semi truck tires on the interstate 6 miles away but they really fixed those tires.
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- Feb 20, 2022
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Kohler single cylinder K321 is one of the loudest pieces of equipment I've ever used. Single hearing protection is barely sufficient, I started using double for hour long mowing.
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