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How to make a small engine quiet?
Posted by: Dakota
Date: June 29, 2008 07:04PM
Between couple of lawn mowers, riding tractors, trimmer and blowers, I have all manners of small engines, all of them unnecessarily loud. I don't think the engineers spent anytime on noise reduction. What can I do after the fact?
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Re: How to make a small engine quiet?
Posted by: mattkime
Date: June 29, 2008 07:14PM
convert them to electric?







VTPKL it!
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Re: How to make a small engine quiet?
Posted by: N-OS X-tasy!
Date: June 29, 2008 07:14PM
Install a small muffler.



It is what it is.
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Re: How to make a small engine quiet?
Posted by: Rick-o
Date: June 29, 2008 07:16PM
I just turn the volume up on my Shuffle! Drowns out almost *all* of that annoying motor noise and I can hear some great tunes in the process!

*Disclaimer my 50 year old ears have been exposed to 30+ years of factory noise. Do not try this if your ears are young!





“There is no greater calling than to serve your fellow men. There is no greater contribution than to help the weak. There is no greater satisfaction than to have done it well.”

- Walter Reuther
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Re: How to make a small engine quiet?
Posted by: Jack D.
Date: June 29, 2008 07:20PM
WHAAATTTTT????? I CAN"T HEAR YOU.....





- Jack D.




New tasteless sig coming soon!
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Re: How to make a small engine quiet?
Posted by: olnacl
Date: June 29, 2008 07:42PM
Some time ago, a Walker Muffler Company rep gave a talk on exhaust silencers. According to what he said, they first create a muffler that is as close to absolute quiet as possible, then engineer the sound (noise) the customer desires back in. In the case of small engines, the noise level is designed to cover the mechanical noise of the engine.



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Re: How to make a small engine quiet?
Posted by: lafinfil
Date: June 29, 2008 07:45PM
Do they have a correct working muffler ? (except 2 strokes - way noisy by nature)

If the engine is not under cover (as on a lawn tractor) other than a properly sized working muffler
there isn't a lot more you can do. Look at the specs for the engine. Most manufactures have them online
(although you may have to dig a bit) and see if you can add a bigger muffler.

As far as tractors - many of the newer ones use a twin cylinder engine running at a high RPM
using the minimum muffler that they can get by with. Sometimes these can be upgraded
without effecting performance with excessive back pressure.

My neighbors all have newer ones (lots of different brands & engine specs) and they are all loud
even when sitting at idle. Manufacturers use more HP at a higher RPM and give no thought to sound suppression.

You often will find older designs are much quieter - running at lower RPM.

you look at the old tractors running old Kohler K series engines (Deere's, Cubs, Wheel Horse, Bolens etc ...)

I have had a number of 30 year old + riders (garden tractors if you please)
Deere's running a 10 to 12 HP Kohler single lung. The last one I rebuilt (2 years ago)
I was shocked that the muffler was $65 - but it's a big muffler 12" long - 5 " diameter
and a deflector on the end that directs sound away from the operator.
Looks like it belongs on a small car.

Between that & the "quiet design" side shields (again on an early '80's tractor) I can sit on it at idle and hold a conversation
and at full throttle mowing the deck noise is louder that the engine.

So that said - a lot of it is design and engineering - which have seems to have gone down hill.

You can try adding some sound deadening material under the hood (like used in car doors)
That and a muffler upgrade may quiet it down a bit.







Edited 1 time(s). Last edit at 06/29/2008 07:48PM by lafinfil.
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Re: How to make a small engine quiet?
Posted by: Grateful11
Date: June 29, 2008 07:56PM
Quote
mattkime
convert them to electric?

Sounds like a plan. Check these out:

[www.mytractorforum.com]

These haven't been made in quite some time.

[www.elec-trak.com]



Grateful11
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Re: How to make a small engine quiet?
Posted by: lafinfil
Date: June 29, 2008 08:01PM
I saw an electric one for sale on craigslist a few months ago - Sears I think

I think the hum of the charger would keep you awake !
Good point on the electric though - maybe convert some of the smaller ones lthat are 2 stroke to
electric or battery versions.







Edited 1 time(s). Last edit at 06/29/2008 08:03PM by lafinfil.
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Re: How to make a small engine quiet?
Posted by: Don Kiyoti
Date: June 29, 2008 08:26PM
rick-o is there some kind of obscure point you're trying to make with that picture? or is it your (much too large) sig?





[picasaweb.google.com] [www.flickr.com]
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Re: How to make a small engine quiet?
Posted by: M>B>
Date: June 30, 2008 01:03AM
Ear @#$%& or ear plugs!

A selection of plugs here...

[www.etymotic.com]

I use them when operating loud machinery or at concerts!
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