MrNomad
Well Known Member
O-360 - RV9A - Vetterman exhaust with mufflers & heater shrouds on both sides.
The rite side muffler shroud routes air thru a scat tube to the heater located on the firewall.
The question is, where does the left muffler shroud get its air from and where does it vent? Carb heat will come from the standard source.
I thought about removing the muffler shroud on the left side but Clyde at Vetterman's nixed the idea. Vetterman's instructions tell you NOT to operate the engine w/o air going thru the muffler shroud.
How about building a scallop to capture the air passing thru the oil cooler and direct that warm air down to the shroud? It's better than nothing, but I don't want to restrict air passing thru the oil cooler.
I don't want to cut another hole in the baffle next to the oil cooler for a scat tube line cause that would decrease the amount of air forced over the cylinders and oil cooler.
Final thought: How about cutting a hole at the bottom of the left nostril alum shroud, attach a scat tube there allowing incoming air to travel down to the muffler / shroud? Will that reduce the amt of air rammed thru the left nostril and onto the left side of the engine?
I look forward to suggestions and ideas.
I plan to add a Dynon EMS with egt and cht so I can measure the difference between cylinders but that won't help determine if the muffler is being damaged.
I'd hate to plug up a muffler at 11.5
Barry
Tucson
PS: Thanks Jeff, for the great website.
The rite side muffler shroud routes air thru a scat tube to the heater located on the firewall.
The question is, where does the left muffler shroud get its air from and where does it vent? Carb heat will come from the standard source.
I thought about removing the muffler shroud on the left side but Clyde at Vetterman's nixed the idea. Vetterman's instructions tell you NOT to operate the engine w/o air going thru the muffler shroud.
How about building a scallop to capture the air passing thru the oil cooler and direct that warm air down to the shroud? It's better than nothing, but I don't want to restrict air passing thru the oil cooler.
I don't want to cut another hole in the baffle next to the oil cooler for a scat tube line cause that would decrease the amount of air forced over the cylinders and oil cooler.
Final thought: How about cutting a hole at the bottom of the left nostril alum shroud, attach a scat tube there allowing incoming air to travel down to the muffler / shroud? Will that reduce the amt of air rammed thru the left nostril and onto the left side of the engine?
I look forward to suggestions and ideas.
I plan to add a Dynon EMS with egt and cht so I can measure the difference between cylinders but that won't help determine if the muffler is being damaged.
I'd hate to plug up a muffler at 11.5
Barry
Tucson
PS: Thanks Jeff, for the great website.