I found this very interesting, particularly since I have the same generator.
the level of detail he went to in soundproofing is remarkable, though I really worry about
how much back pressure he just added to that exhaust system.
Other than reduced power, how else can that damage your motor? Valves?
listen to how obnoxiously loud this thing is as delivered. I hide mine in an outside corner facing the woods.
I like to work in wood so think I might like to build this myself. I can't imagine the materials costing more than the 150 bucks he paid
for this. though Soundown insulation or other high tech stuff is very pricey. Lumber has come back down quite a bit, time to build again.
I grew up on a farm with an ancient large Onan LP generator, 1950 or so, I'm guessing 12-15kw, that had this same kind of flex metal exhaust piping, went through a hole
in the stone wall, no need for a flange, about four feet total, to a small car muffler outside, maybe a foot long. It made a nice muted sound. Gen was connected to
well pump in same building which fed three homes on the farm. Two 100 gallon tanks outside which local gas company filled. Today I don't think they'd come out.
And one 220V line down to my grandfather's home 100 feet away, underground, winding up on a panel
in his old concrete basement. Everyone else stayed in the dark but we had water. Towards the end the gen wasn't very reliable probably because it was never properly serviced.
I remember the milkshake ring on the oil dipstick, lot of condensation must have gotten in there. I had no idea. My father couldn't use an adjustable wrench so I didn't get taught much early on.
Thankfully he gave me other gifts... Milkshake ring on a dipstick is a cry for help.,
Those old Onans were the nicest soft green color, close to a Detroit Diesel green
Nice rounded almost art deco enclosures.