Porting and Polishing Experience
Rock Crawling
Joined: Apr 2008
Posts: 417
Likes: 41
Two primary goals, first, don't remove too much material that you breach a water jacket; two, you are seeking a smooth progressive transition from valve bowl to gasket matched port exit. Eliminate any bottleneck in transition and avoid removing too much in transition. Besides increasing the volume of the port flow, you are also seeking to maintain consistent velocity. Remove too much and the gasket is restricting flow. Remove too little and there is a bottleneck near the valve.
Two primary goals, first, don't remove too much material that you breach a water jacket; two, you are seeking a smooth progressive transition from valve bowl to gasket matched port exit. Eliminate any bottleneck in transition and avoid removing too much in transition. Besides increasing the volume of the port flow, you are also seeking to maintain consistent velocity. Remove too much and the gasket is restricting flow. Remove too little and there is a bottleneck near the valve.
I’ve watched some tutorials on how to port and polish, and in particular Eastwood has one. I am going to get a dremel to notch my thread chasers, and am really starting to consider port matching the intake and exhaust ports.
I am thinking to go into it as more of a polish and see how it goes with 80 grit. Stay away from carbide bits or the more invasive tools.
just using the sandpaper, and not bothering the valves, what is my risk of catastrophic error?
I am thinking to go into it as more of a polish and see how it goes with 80 grit. Stay away from carbide bits or the more invasive tools.
just using the sandpaper, and not bothering the valves, what is my risk of catastrophic error?
Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Catasrophic? Negligible, especially staying away from the carbides. The only thing that would truly destroy the head would be hitting a water jacket, and honestly even that can be fixed if you've got a friend that can TIG weld. Just a pain in the rear.
do you use a marker or do you have the machinists coating?
Last edited by CollieRover; Apr 7, 2018 at 03:25 PM.
