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I did a muffler experiment. I used a beautifully designed polaris muffler.
The experiment is in my signature thread somewhere.
Leaving the onan muffler in place, an additional muffler had no affect. No affect straight on, less than 2 decibel at a 45 angle.
The muffler onan uses is actually very good at muffling.
The loud sound isn't from the exhaust it's from the miserable cast metal fan they use on the flywheel.
After some extensive-ish research I found a flywheel for 80 bucks I can buy, mill off the archaic miserable fan and then install an electric fan(I mean, if the damn generator is working the fan will be working, if the generator isn't, the fan won't).
Or
I've found Styrofoam board used as sound baffles will drop a bunch of staccato and mid range decibels off the fan. It leaves the bass. The noise is still there it just assaults less like a vacuum cleaner and more like a drumming.
But while building the baffle system, which is pretty easy:
I have since become convinced I can add a second alternator and run my v10 instead of the generator. It's quieter and my v10 uses just at/over three fifths of a gallon an hour, about what the onan uses.
So, for the investment in a second alternator(I already have a Biggish inverter and it stacks to go from 3k to 6k easily) I can sell the onan to recoup the alternator cost and wind up with a rather big storage area in the back, and a quiet smooth running v10 generating all of my elctric
I'm convinced generators are added to motorhomes because they're expected.
Since the advent of pure sine wave inverters a generator is kinda like a snapping turtle as a pet.
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