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DIY: Port and Polish
My idea of port and polish
Kinda a DIY:
One way to do it without a flow bench is by first disasembling the head, and cleaning the entire bare head. Then do you porting and polish by hand with 180 sand paper and oil for lubricant. Port out two ports at a time, constantly putting the valves springs and retainers back in to measure out big the port is.
How you do this is:
After putting the valves spring and retainers back in and making sure with a vaccum gauge (a vacuum pump works best but a hand vacuum pump will do just fine. Once you have 17-21 in/hg of vacuum on both ports you fill both ports with water to the top (level with the top of each port). Then measure by pouring out or removing the water in each port and measure the volume of the water. Once you have to ports that have the same amount of water in them you know that each port is the same size.
I know this sounds very time consuming and tedious to do but professional port and polishing does cost quite a bit. So for all those who are really motivation and like those small project like i do( ps this is a pretty good way (in my option) to do it for cheap.)
Let me know what you think!
Thanks!
The Honda head in these pictures is a B20 JDM head and its the first one did:
Kinda a DIY:
One way to do it without a flow bench is by first disasembling the head, and cleaning the entire bare head. Then do you porting and polish by hand with 180 sand paper and oil for lubricant. Port out two ports at a time, constantly putting the valves springs and retainers back in to measure out big the port is.
How you do this is:
After putting the valves spring and retainers back in and making sure with a vaccum gauge (a vacuum pump works best but a hand vacuum pump will do just fine. Once you have 17-21 in/hg of vacuum on both ports you fill both ports with water to the top (level with the top of each port). Then measure by pouring out or removing the water in each port and measure the volume of the water. Once you have to ports that have the same amount of water in them you know that each port is the same size.
I know this sounds very time consuming and tedious to do but professional port and polishing does cost quite a bit. So for all those who are really motivation and like those small project like i do( ps this is a pretty good way (in my option) to do it for cheap.)
Let me know what you think!
Thanks!
The Honda head in these pictures is a B20 JDM head and its the first one did:
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