Post by 190mech on Oct 26, 2014 18:42:09 GMT -5
Swirl polishing removes the rouhgness on the port side of the valve,the vertical lines from it keep any stress risers from causing valve head failure,it also increases flow slightly and helps keep crud from building up too.
I used my little home lathe to spin the valve,but a drill clamped in a vice will get the same results,did a Geo Metro intake valve(sorry,not much 4T stuff in my garage!).Here is the valve before work;
While the valve is spinning a stone on a Dremel is used for course cuts,note the angled stone;
After the course cut,a sanding drum is used for the medium cut,same angle;
Finally a Cratex wheel is used for the final cut/polish,same angle again;
The results are all machine marks are in an even pattern that does not create stress risers that could cause valve head seperation;
Alterations and other mods to this setup are welcome!!
I used my little home lathe to spin the valve,but a drill clamped in a vice will get the same results,did a Geo Metro intake valve(sorry,not much 4T stuff in my garage!).Here is the valve before work;
While the valve is spinning a stone on a Dremel is used for course cuts,note the angled stone;
After the course cut,a sanding drum is used for the medium cut,same angle;
Finally a Cratex wheel is used for the final cut/polish,same angle again;
The results are all machine marks are in an even pattern that does not create stress risers that could cause valve head seperation;
Alterations and other mods to this setup are welcome!!