so, i bought this 44mm tial knock off vband gate, and pulled it down to port it a little, and tidy it up in general. i noticed that the valve only sealed perfectly (i'm fussy, it was good enough) in one orientation, and thus, i decided to lap the valve. no big deal. i decided to make short work of it by using a power drill to do it. no big deal. i decided to turn it backwards too.... big deal. the head of the valve was threaded onto the stem :-) its welded on now, and centred better, and seals perfectly no matter which way its turned.
moral of the story, if its a cheap one, check it out before bolting it on.
pics :
http://i50.photobucket.com/albums/f3...astegate-3.jpg
http://i50.photobucket.com/albums/f3...astegate-2.jpg
http://i50.photobucket.com/albums/f3.../wastegate.jpg
http://i50.photobucket.com/albums/f3...astegate-1.jpg
http://i50.photobucket.com/albums/f3...astegate-4.jpg
http://i50.photobucket.com/albums/f3...astegate-5.jpg
pics of the problem and solution :
http://i50.photobucket.com/albums/f3...astegate-6.jpg
http://i50.photobucket.com/albums/f3...astegate-7.jpg
http://i50.photobucket.com/albums/f3...astegate-8.jpg
http://i50.photobucket.com/albums/f3...astegate-9.jpg
http://i50.photobucket.com/albums/f3...stegate-10.jpg
http://i50.photobucket.com/albums/f3...stegate-11.jpg
in order ...
looks ok
threaded surprise
drilled and counter sunk
ready to weld
welded
ground clean
might pay to check the dodgy ones thoroughly if you buy em ;-)
fred.