ArlingtonRV
Well Known Member
I am experiencing problems with the lower cowl and the #2 exhaust pipe. Pictures can be seen here: http://www.hangara13.com/Cowl.html.
I first noticed this after the engine was run on the ground for about 15 minutes (third time it was run). At the time the exhaust tube was in contact with the cooling duct, so naturally I figured that was the problem.
After repairing the cowl and moving the muffler to the right about 1 1/7" I had between 1/16 and 1/8 clearance between the tube and the duct. I can't figure out how to get any more. I thought it would be adequate. After about 15 minutes again I had heat damage to the duct.
Engine temperatures (oil, CHT, EGT) are well within the green and both CHT and EGT on the left side are slightly lower than the right. I'm a little confused and concerned.
I was a little concerned about ground runs so I asked Van's whether they should be made with the bottom cowl on or off, I didn't like the idea of the oil cooler just laying on the muffler. They confirmed bottom cowl on.
I wonder if it has anything to do with the top cowl being off? It might be that the airflow just isn't right with the top cowl off.
What have those of you that didn't have problems do? I also have a question in to Van's on the same topic.
Thanks
I first noticed this after the engine was run on the ground for about 15 minutes (third time it was run). At the time the exhaust tube was in contact with the cooling duct, so naturally I figured that was the problem.
After repairing the cowl and moving the muffler to the right about 1 1/7" I had between 1/16 and 1/8 clearance between the tube and the duct. I can't figure out how to get any more. I thought it would be adequate. After about 15 minutes again I had heat damage to the duct.
Engine temperatures (oil, CHT, EGT) are well within the green and both CHT and EGT on the left side are slightly lower than the right. I'm a little confused and concerned.
I was a little concerned about ground runs so I asked Van's whether they should be made with the bottom cowl on or off, I didn't like the idea of the oil cooler just laying on the muffler. They confirmed bottom cowl on.
I wonder if it has anything to do with the top cowl being off? It might be that the airflow just isn't right with the top cowl off.
What have those of you that didn't have problems do? I also have a question in to Van's on the same topic.
Thanks