Rottler P69 Porting a Lima Head

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andyofcolumbusmerkur
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Rottler P69 Porting a Lima Head

Post by andyofcolumbusmerkur »

"Excellence does not require perfection." H.James
john keefe
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Re: Rottler P69 Porting a Lima Head

Post by john keefe »

Very cool, especially considering how long it takes to get even close to that with hand porting the head alone. I wonder if those cut-ridges will get smoothed out with a finer bit/stone. IIRC, though, there's a long-standing debate whether leaving those ridges improve flow by inducing tumbling around the valves for more even entry into the chamber, vs. ultra smooth (e.g., Extrude Honing).
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andyofcolumbusmerkur
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Re: Rottler P69 Porting a Lima Head

Post by andyofcolumbusmerkur »

It's suppose to make it flow better, like the dimples on a golf ball.
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andyofcolumbusmerkur
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Re: Rottler P69 Porting a Lima Head

Post by andyofcolumbusmerkur »

Sorry that wasn't the video with the dimple finish, this YB head has the dimple finish, like a golf ball.
https://www.youtube.com/watch?v=Sofy4tuvJ5c
:headbang
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