The roughness in an intake helps with the atomization of your fuel and air. It creates turbulence. Now, porting and polishing equipment that oil flows through now that is different.
GM did huge amount of research on this a million years ago and found no noticeable power differences. Read the Smokey Yunick stuff from decades ago. Fuel injection offers the best atomization ever....wall finish really doesn't matter. Dimples, rough cartridge roll, smooth flap etc etc etc. If there was one perfect interior surface everybody would be copying it.
Nice job it's easier if you put lay out die on the inside for blending contours, when I did mine I used a straight grinder with a cartridge roll to knock down the heavy surface. Then more die to find low spots and work the short Radius in to cylinders. 180 grit then 220 grit with scotch pad ,you should have taken the gasket and put on front to scribe a line on inside to grind away more flow. You should leave everything loose , put altogether then tighten intake, tb,ac could you tell the difference?? I could when I switched to the S/S 55mm...
I'm not a master tech myself but this was kind of entertaining watching your videos and you learning as you go. Not trying to be offensive or anything and just finding your channel.
@@harleydave2316 all the Aluminum intakes are sand cast molds same as car intakes . If that were true the plastic intakes would be like that , I never built a Prototype plastic intake with sand blasting on the mold to give that texture hard to pull parts out of plastic injection molded parts.
If it was carburated you would leave it alone, The reason being you need turbulance to help keep air and fuel atomized as it travels to valve. With that said, I would still remove any casting lines. With fuel injectors spraying directly above valve you would polish the intake to increase volocity. as far as HP/TQ gains, none until the rpms are above 3500 to 4000 up to 6000rpms. you would be lucky to get more than 4 to 5 HP/TQ. At lower rpms there is no gain or loss. 4 or 5 HP/TQ is nothing to look down your nose at. A added benifit is it doesn't warp like the plastic intake and have vacum leaks.
Nice job. I'd much rather see all the fumbling, like I'll be doing, when I replace mine this week, than a perfect install. Better to learn by IMO. Everyone has different techniques. Thanks!
Those screws are hard to get to I'm going to do mine and have regular Allen wrenches I'm going to pickup the ones that you can use at an angle like u have for the front No other way lol Thanks for showing hiw u did it thumbs 👍
What you just did is dead wrong Bro,..the roughness in the material of the EFI body and the Heads themselves helps mixing an atomizing the fuel mixture. You could risk a “throw-flame” effect that will burn holes in your cylinder wall or piston and thats a damn fact…talking from experience ☝🏻☠️
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The roughness in an intake helps with the atomization of your fuel and air. It creates turbulence. Now, porting and polishing equipment that oil flows through now that is different.
You might wanna see where the injectors are, carb yes, fuel injected no.
GM did huge amount of research on this a million years ago and found no noticeable power differences. Read the Smokey Yunick stuff from decades ago. Fuel injection offers the best atomization ever....wall finish
really doesn't matter. Dimples, rough cartridge roll, smooth flap etc etc etc. If there was one perfect interior surface everybody would be copying it.
Nice. Hope you see some incredible gains.
Nice job it's easier if you put lay out die on the inside for blending contours, when I did mine I used a straight grinder with a cartridge roll to knock down the heavy surface. Then more die to find low spots and work the short Radius in to cylinders. 180 grit then 220 grit with scotch pad ,you should have taken the gasket and put on front to scribe a line on inside to grind away more flow. You should leave everything loose , put altogether then tighten intake, tb,ac could you tell the difference?? I could when I switched to the S/S 55mm...
I'm not a master tech myself but this was kind of entertaining watching your videos and you learning as you go. Not trying to be offensive or anything and just finding your channel.
I could be mistaken but I believe s&s doesn't polish the manifolds for a reason. Something about air velocity and proper mixture of the gas.
@@harleydave2316 all the Aluminum intakes are sand cast molds same as car intakes . If that were true the plastic intakes would be like that , I never built a Prototype plastic intake with sand blasting on the mold to give that texture hard to pull parts out of plastic injection molded parts.
If it was carburated you would leave it alone, The reason being you need turbulance to help keep air and fuel atomized as it travels to valve. With that said, I would still remove any casting lines. With fuel injectors spraying directly above valve you would polish the intake to increase volocity. as far as HP/TQ gains, none until the rpms are above 3500 to 4000 up to 6000rpms. you would be lucky to get more than 4 to 5 HP/TQ. At lower rpms there is no gain or loss. 4 or 5 HP/TQ is nothing to look down your nose at. A added benifit is it doesn't warp like the plastic intake and have vacum leaks.
Nice job. I'd much rather see all the fumbling, like I'll be doing, when I replace mine this week, than a perfect install. Better to learn by IMO. Everyone has different techniques. Thanks!
Hi how did you clean the manifold after polishing?? Great video
Those screws are hard to get to I'm going to do mine and have regular Allen wrenches
I'm going to pickup the ones that you can use at an angle like u have for the front
No other way lol
Thanks for showing hiw u did it thumbs 👍
I installed this
What you just did is dead wrong Bro,..the roughness in the material of the EFI body and the Heads themselves helps mixing an atomizing the fuel mixture. You could risk a “throw-flame” effect that will burn holes in your cylinder wall or piston and thats a damn fact…talking from experience ☝🏻☠️
Is the stock plastic one smooth or rough
Time for a new drummel