Doodle Posted February 25, 2004 Report Share Posted February 25, 2004 I just got my cylinders honed out and I got a new set of Wiseco pistons. When I read the instructions on installing the pistons it said to make sure and chamfer the ports. My question is how do I do this and what tool do I need to do this? Any help appreciated. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted February 25, 2004 Report Share Posted February 25, 2004 ive never heard of such thing. what would installing the pistons have to do with the ports?? wait till you get a few more responses before doing anything. i would even like to hear what one has to do with the other. Quote Link to comment Share on other sites More sharing options...
Doodle Posted February 25, 2004 Author Report Share Posted February 25, 2004 ive never heard of such thing. what would installing the pistons have to do with the ports?? wait till you get a few more responses before doing anything. i would even like to hear what one has to do with the other. According to Wiseco's instructions every time you hone out a cylinder you should chamfer all the ports to rid the cylinder of any "burrs". Quote Link to comment Share on other sites More sharing options...
scotts96fast Posted February 25, 2004 Report Share Posted February 25, 2004 yep,You shound grind the ports so the rings won't hang up on them.just honing the cylinder I'm not sure if you need to grind the ports????For sure if you bore them out!! Quote Link to comment Share on other sites More sharing options...
Creole Posted February 25, 2004 Report Share Posted February 25, 2004 I did mine and it didn't have a real burr just a sharp edge. Use a fine file and just break the edge. Quote Link to comment Share on other sites More sharing options...
GEEZR Posted February 25, 2004 Report Share Posted February 25, 2004 I remember when I bored and honed my cylinders there were sharp edges to chamfer out of the port areas.I used 240 grit emery cloth. I only chamfered the horizontal edges and not the vertical ones since the pistons move parallel to the vertical ones anyway. All in all it was a pain in the effen ass but I did it. I just wanted to bolt the top end back together and ride the SOB. Quote Link to comment Share on other sites More sharing options...
Meat Posted February 25, 2004 Report Share Posted February 25, 2004 most machine shops will chamfer the ports after they bore. Whenever you have your juggs bored to the next size, ask the machinist to chamfer the ports. You absolutely must have the port edges chamfered, the sharp unchamfered port edges will act like a scraper and will eventually damage the pistons. But the main purpose of chamfering is to prevent the rings from snagging on a port, by easing the ring back into its groove. Chamfer the ports with a VERY SLIGHT BEVEL, tapering in toward the port tunnel. Chamfer the top and bottom of all the ports, starting at the side of the port and progressing towards the center. Keep the bevel uniform. I was taught that the top of the exhaust port should be chamfered so that the sides are chamfered slightly and progressively get higher toward the center of the port. You can use a hand file, but a fine rotary stone does the work faster. Lightly file off the sharpness from the edges of sides of the port window, then work the top and bottom of the ports starting at the side of the port and working towards the center. You don't need a big huge bevel around the ports, just take off the sharp edges and feather it out so it uniform and neat. If your have any doubts about your ability to chamfer your own ports, by all means have your machine shop do it for you after the bore the jugg. Quote Link to comment Share on other sites More sharing options...
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