Looks like you did a nice job! I know silicon carbide paper is black. Is Carborundom red? You can get floor sander paper from a roll so you don't have to stagger 8.5 x 11 sheets and eliminate the edges. What grit paper did you use? I think the floor sander paper in fine is somewhere between 120 to 220 which is close to the finish you want on the head. Did you do it wet or dry? How many times did you re-use the head bolts?Quote from: Mark(The Miser)UK on August 24, 2011, 07:36:54 amhttp://imageshack.us/g/222/tenthabradeka0.jpg/Here's a few pictures of the various stages of my 'hand' abrading my head some 3 years ago. Done due to a head gasket failure.Things to note are: My use of carborundum paper on 3 layers of plate glass, padded with sheets of newspaper to compensate for any 'sag'My use of a counter weight to offset the weight of the manifolds.My leaving of the manifolds on to avoid pre/post abrading, warping of head, and flexing cam holders.Each head pic denotes six traverses along the paper.Every 3 slides, head lifted and filings brushed away. I found this neccessary, else build-up of inconel grit scoured the rest of the head. Note symetrical abrading. Note part of head warping is for the inconel to twist and sink into the head.Note the abrading took the ears off the ex manifold too. No issues in 3 years. Took head off last year to do the rering. Reused bolts, as only torqued to 45 deg or less each time, as and when each bolt hit the plastic range.
http://imageshack.us/g/222/tenthabradeka0.jpg/Here's a few pictures of the various stages of my 'hand' abrading my head some 3 years ago. Done due to a head gasket failure.Things to note are: My use of carborundum paper on 3 layers of plate glass, padded with sheets of newspaper to compensate for any 'sag'My use of a counter weight to offset the weight of the manifolds.My leaving of the manifolds on to avoid pre/post abrading, warping of head, and flexing cam holders.Each head pic denotes six traverses along the paper.Every 3 slides, head lifted and filings brushed away. I found this neccessary, else build-up of inconel grit scoured the rest of the head. Note symetrical abrading. Note part of head warping is for the inconel to twist and sink into the head.Note the abrading took the ears off the ex manifold too. No issues in 3 years. Took head off last year to do the rering. Reused bolts, as only torqued to 45 deg or less each time, as and when each bolt hit the plastic range.
Very cool! How much was the warpage before you sanded it down?
Flawed.The file is going to be softer then the inconel, and the weight required to press in the tooling to form the knurl (not cut/scratch) would be immense. Crude cold forming, no?Props for the drawing, the engineering department at my previous employer could have used you. Much better then a dootle on a napkin (in crayon, even) I would normally get.Peen them in if your worried, grease them and slap them in if your like most on here. Used THE PROPER injector/nozzle for your make of car (tested) and be on with your day..02
Hand filing will not help all to much.It might help hold when peened, but thats about it.Knurling is a forming operation that presses material into a knurling tool. The pressing causes the texture, and also bring up to diameter, usually upwards or .005 (depending on material/depth and type of knurl)It's a bit touchy to do on a manual lathe on steel, let alone an exotic metal.