Rainy day here today so I pulled the cowling to see why the exhaust pipe was off centre. There is one attachment to the engine block and the clamp that goes with that hanger is supposed to secure the left side of the "Y" pipe and the left exhaust together The plans point this out and note a notch in the end of the pipe that should allow the outer pipe to be compressed to squeeze the inner pipe.
This keeps the main exhaust pipe entered in the tunnel.
As it turns out the clamp that I received would not compress the pipe enough to secure the two pipes together. I see no danger of the pipe actually coming loose but it definitely allowed the tail pipe to shift to the left as Scott noted in my first picture.
I was able to secure the pipe properly by inserting a shim half way around the pipe between the pipe and the clamp. This allow the clamp to tighten down properly on the pipe.
I do not expect this change to make any difference on sound or vibration.
Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average
speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger flying #153
St.Thomas, Ontario Canada, CYQS