Posted by Bob M on February 12, 2009 at 09:02:18 from (151.190.254.108):
In Reply to: Intake noise posted by Dan Homan on February 12, 2009 at 02:02:49:
Dan – Like Dieselpaul suggests not much noise comes from the intake. Only under full load (ie. with carb throttle plate wide open) will you get noise you can even distinguish from other engine sounds.
You don't say what engine is on your Murray but this applies to all air-cooled engines: Aside from the obvious the exhaust, noise comes from the cooling (flywheel) fan and from general mechanical (valve mechanism) clatter.
These noises can be attenuated by partially surrounding/shielding the engine with sound deadening material. But you must leave PLENTY of space for cooling airflow! Look at an enclosed air cooled standby or RV generator for ideas how manufacturers accomplish this.
Your cheapest solution however is to install the quietest muffler you can find, then simply operate the engine at the lowest RPM's possible. Ie run the machine in a high a gear with the engine running at or just above idle.
Good luck – it sounds like an interesting and useful project!
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