nismo.capri Posted January 5, 2007 Share Posted January 5, 2007 Interesting. No Filters FTW. Love those types of writeups and dyno pics to prove. Its awsome when someone puts the time and effort on a dyno up for everyone to see. Yup! ....Autospeed is great for that Quote Link to comment Share on other sites More sharing options...
peteretep Posted January 5, 2007 Share Posted January 5, 2007 incase I didnt read that right, did he try it with sock filters or no? interesting reading though, I never thought that would have made so much difference Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted January 5, 2007 Share Posted January 5, 2007 incase I didnt read that right, did he try it with sock filters or no? No sock filters because "Mike believes that sock-type filters wrecks the flow into the belllmouths, so he intended using an airbox over them" interesting reading though, I never thought that would have made so much difference Imagine you have a sphere under water and it's had all the air sucked out of it. What happens when it pops? The pressure of the coloumb of water above it fills the void. It's the same with a NA engine, an engine doesn't suck air in. It creates a low pressure area that allows the air pressure to fill the cyl. So the only thing a NA engine has to push the air in is atmosphereic pressure of 14.7 psi (at sea level). This is why you want an intake that is the lest restrictive as possible and allows the air to flow well. Ever little bit of friction adds up.... Quote Link to comment Share on other sites More sharing options...
Hemi Posted January 5, 2007 Share Posted January 5, 2007 BUT you need some turblence to stir the fuel up effectialy yes?? , hence the reason you dont polish your intake port but do with your exhaust ? id like to know why on some trumpets they have a sheet of steel sitting at the entrance to them (someone should know what im talking bout) apparrently it smooth the air turbulence at the mouth of the trumpets? Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted January 6, 2007 Share Posted January 6, 2007 BUT you need some turblence to stir the fuel up effectialy yes?? , Nope.... but you are on the right track hence the reason you dont polish your intake port but do with your exhaust ? The reason intake ports are left ruff is to create a layer of turbulance just on the surface of the port. The boundry layer of turbulence is like air bearings that the laminar flow rolls on. With polished ports the first layer of molecules adheres to the wall and does not move significantly. The rest of the flow field must shear past which develops a velocity profile (or gradient) across the port.. Same reason golf balls have dimples id like to know why on some trumpets they have a sheet of steel sitting at the entrance to them (someone should know what im talking bout) apparrently it smooth the air turbulence at the mouth of the trumpets? Yep and some heat sheilding Quote Link to comment Share on other sites More sharing options...
Hemi Posted January 6, 2007 Share Posted January 6, 2007 ahhh ok cheers for that Quote Link to comment Share on other sites More sharing options...
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