I just came back from a drive and I’m wondering why my 3.0L I6 engine which has roughly 385HP is relatively quiet besides a low growl compared to my extremely loud lawnmower which as a tiny 6HP single cylinder? Would the muffler of my car make that much of a difference?
In: Engineering
Using long lengths of pipe for the exhaust filters out a lot of higher frequencies from the engine and reduces the noise. Anyone who’s ever ran an engine with any exhaust knows what I’m talking about. Even with headers only, it’s still very noisy.
On push mowers, there’s only a small canister-shaped exhaust or maybe something a little longer but not by much. The ones they have are far too short to muffle the sounds from the engine.
I’m not sure how much this factors in, but cars have a lot of plastic in the interiors and that might play a role in muffling the sounds but the main factor at work is the length of the muffler.
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