ORIGINAL: Terry Holston
The engine MUST be centered in the pipe with NO offset thrust( You mention 2 degrees), This is a NO NO, as it WILL cause hot spots in the pipe walls.................Get a new pipe.
LOL….. Terry he said 2 degrees and not 20. AFAIC 2 degrees are not bad. I wonder how many people would notice 2 degree offset with their naked eyes.
FWIW, I think Kevin W is on the right track with his assessment.