DynomaxVT muffler on rx anyone?
 

Have anyone used the DynomaxVT on a RE? According yo their customer service, a 4.0L+ would be the recommended for a RE. Still, need some input from others ;-)

"The valve in the VT muffler will work properly with a rotary engine. You will want to use the over 4.0L model for the rotary engine.
-Adam Stacy @Dynomax"

Tnx

Th...the founding who?

try it and let us know, the proof would be in how long it lasts at rotary exhaust temps

That's the one thing I think they didn't added to the equation.

That might be why they recommended the 4.0+L system.

The fiberglass will burn out quickly. Rotary exhaust pulses and heat tend to crack lightly- built exhaust components. Still, would be an interesting experiment. Here's a dead muffler pic from Rotary Aviation. (The muffler was not made by them):

Attachment 191947

that broke for different reasons and isn't really relative

^ He speculates as to why but doesn't have a definitive answer. Normal, pistion-engined airplanes get away with that sort of mounting scheme (external to the cowl) without appanent difficulty. EU noise regulations result in many Pipers, Cessnas, etc being retrofitted with external mufflers like that.

Regardless, of the specific example, cracking is a problem. See the BHR experience with the Moroso Spiral-Flow as another example of a piston-ok muffler that doesn't work on a rotary. Charles didn't have any pics of the destruction that I remember though.