That started me to realizing that most Onans aren't installed as well as they could be by RV makers. Now I have a 2800 running at nearly full load at 56 db(a) 23' from the exhaust. I've only fudged a very little on Onan's installation guide. It's all due to a train of thought that you set moving some years back. Again, thank you!
As part of the improvements you made in your Onan's installation to quiet it, did you change the mounts to something similar to these isolation mounts?:
No, Phil, I didn't have enough overhead clearance in the compartment, or the patience to sort thru all the possibilities. I made my own 'isolation mounts' out of a sheet of firm rubber and some Home Depot neoprene washers, like so:
The Tiger's Onan is mounted on top of a pair of flat steel straps. The 4 DIY washers go between the generator and the strap at the bolt points. Using the neoprene washers and flat steel washer, I put slightly longer bolts in from the bottom, and only just snugged them... they're held in place by Loctite to keep from crushing the rubber and neoprene.
They made a noticeable difference in interior noise & vibration, and probably a little in exterior noise.
Jim, "Very funny, Scottie. Now beam down my clothes!"
'06 Tiger CX 'C Minus' on a Silverado 2500HD 4x4, 8.1 & Allison (aka 'Loafer's Glory')