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2020+ Shelby GT500 Mustang
Polishing VMP APEX Predator Lid?
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<blockquote data-quote="CobraBob" data-source="post: 16987923" data-attributes="member: 6727"><p>I remember reading that back in the day when people started to port the Eaton for Terminators, but I can't find a thread and can't really remember the reason why it wasn't recommended. There's a reason why supercharger porters don't usually offer an inside polishing option, maybe above it being time consuming/expensive. I did find a post on a forum that was discussing whether or not polishing the inside of an intake manifold was good or bad. I thought this post was worth sharing since it kind of sheds a little light on whether or not polishing the inside of a blower is beneficial or not.</p><p> </p><p>"For everyone that thinks an intake manifold should be as smooth as possible, or as "smooth as glass," take a look inside Hogans Racing manifolds, Wilsons manifolds, port jobs, etc. You'll notice they'll keep a semi rough finish in the runners/plenum/ports. Typically something your finger nails will catch, but still feel somewhat smooth to the tips of your fingers.</p><p></p><p>As for it being VERY BAD, not exactly. Typically, a casted surface is too rough, therefore even polishing it to a "smooth as glass" finish will help performance. However, if polished with a semi rough surface, it'll help squeeze out some more power. I'm not saying your going to gain loads of power with a semi rough surface, but when it comes down to it, it'll yield greater results than a perfectly smooth finish.</p><p></p><p>Something else you want to keep in mind is the fuel. As well as injecting water/alcohol. A small amount of turbulence will help them mix with the air better. However, injector placement has a large effect on this as well.</p><p></p><p>Bottom line, a "smooth as glass" finish is typically better than a casted or extremely rough surface, <strong>and a <u>semi rough</u> finish will usually yield the best results</strong>.</p><p></p><p>Oh, and before someone brings up the extrude hone process, most racers only use this process to enlarge runners. They'll usually go back and rough the surface up some."</p></blockquote><p></p>
[QUOTE="CobraBob, post: 16987923, member: 6727"] I remember reading that back in the day when people started to port the Eaton for Terminators, but I can't find a thread and can't really remember the reason why it wasn't recommended. There's a reason why supercharger porters don't usually offer an inside polishing option, maybe above it being time consuming/expensive. I did find a post on a forum that was discussing whether or not polishing the inside of an intake manifold was good or bad. I thought this post was worth sharing since it kind of sheds a little light on whether or not polishing the inside of a blower is beneficial or not. "For everyone that thinks an intake manifold should be as smooth as possible, or as "smooth as glass," take a look inside Hogans Racing manifolds, Wilsons manifolds, port jobs, etc. You'll notice they'll keep a semi rough finish in the runners/plenum/ports. Typically something your finger nails will catch, but still feel somewhat smooth to the tips of your fingers. As for it being VERY BAD, not exactly. Typically, a casted surface is too rough, therefore even polishing it to a "smooth as glass" finish will help performance. However, if polished with a semi rough surface, it'll help squeeze out some more power. I'm not saying your going to gain loads of power with a semi rough surface, but when it comes down to it, it'll yield greater results than a perfectly smooth finish. Something else you want to keep in mind is the fuel. As well as injecting water/alcohol. A small amount of turbulence will help them mix with the air better. However, injector placement has a large effect on this as well. Bottom line, a "smooth as glass" finish is typically better than a casted or extremely rough surface, [B]and a [U]semi rough[/U] finish will usually yield the best results[/B]. Oh, and before someone brings up the extrude hone process, most racers only use this process to enlarge runners. They'll usually go back and rough the surface up some." [/QUOTE]
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Polishing VMP APEX Predator Lid?
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