Is this PI intake trashed?
01-09-2011, 06:36 PM
#1
Thread Starter
Join Date: Dec 2009
Location: IL
Posts: 44
Is this PI intake trashed?
well just got a PI intake used and am a little worried that there is some extreme wear. the inside of the intake channles leading to the top of the heads are really ruff and have like wrinkles in the inside of them and not smooth whatsoever except in certain spots. is this normal wear and tear or did this intake get fried lol.. could i sand this problem to fix it?
this is the smoothest one
this is the smoothest one
01-09-2011, 08:07 PM
#3
2nd Gear Member
Join Date: May 2010
Location: mississippi
Posts: 386
When my non-pi intake manifold cracked on me I purchase a new PI intake and the
inside of it looked alot smoother than that.It is possible that the PI intake you purchased
could have been used on a mustang that overheated.I notice that that PI intake
manifold has alot of carbon deposit build up on it.I wouldn't install that PI intake on my mustang.I would purchase a brand new PI intake manifold they are not that expensive
anyway.
inside of it looked alot smoother than that.It is possible that the PI intake you purchased
could have been used on a mustang that overheated.I notice that that PI intake
manifold has alot of carbon deposit build up on it.I wouldn't install that PI intake on my mustang.I would purchase a brand new PI intake manifold they are not that expensive
anyway.
01-10-2011, 02:02 AM
#8
Thread Starter
Join Date: Dec 2009
Location: IL
Posts: 44
I do not know cause the guy i bought it off of was told it was off a daily driver. i have started to sand it its helping but i dont think it well ever be perfect cause my fingers cant handle being cut so much. Where could i find an Extrude honer or possibley borrow?
01-10-2011, 05:10 AM
#9
When my non-pi intake manifold cracked on me I purchase a new PI intake and the
inside of it looked alot smoother than that.It is possible that the PI intake you purchased
could have been used on a mustang that overheated.I notice that that PI intake
manifold has alot of carbon deposit build up on it.I wouldn't install that PI intake on my mustang.I would purchase a brand new PI intake manifold they are not that expensive
anyway.
inside of it looked alot smoother than that.It is possible that the PI intake you purchased
could have been used on a mustang that overheated.I notice that that PI intake
manifold has alot of carbon deposit build up on it.I wouldn't install that PI intake on my mustang.I would purchase a brand new PI intake manifold they are not that expensive
anyway.
01-10-2011, 05:13 AM
#10
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
An extrusion hone (abrasive flow maching) device, capable of doing a V8 intake manifold, would be some 8 feet or so tall and weigh 4000+ lbs--something like this:
I do not know that the plastic intake could withstand the process.
The good news is that the ripples you observe do not impact the flow other than to perhaps improve it a bit. They will create boundary layer turbulence, which behaves as a liquid bearing that "lubricates" the main flow and wall of the intake--and reduces drag.
On a mirror smooth surface the speed of the fluid molecules is zero, as they stick to the surface, the passing molecules drag on these "stuck" molecules as they pass. On a roughned surface the turbulent boundary builds as a very thin layer of molecules recirculates between those that a stuck and the main laminar flow, reducing drag on the main flow.
This is why golf ***** have dimples, they would not fly half as far is they were smooth. It is also why pig-pong ***** seem to fly oddly; beyond that they do not weigh much, as their "spin" slows the boundary layer drag increases and they slow rapidly.
Forget 100mph fastballs too, if baseballs were smooth...
On a flow bench differences of 0.5 to 1.0%, between smooth and rough surface intakes are typical, and that is likely due to the slight enlargement of the passage ways caused by the polishing. Mirror finsh passages will always flow worse than rough finish if dimensionally idential parts are tested.
Google "porting and polishing myth" for more...
I do not know that the plastic intake could withstand the process.
The good news is that the ripples you observe do not impact the flow other than to perhaps improve it a bit. They will create boundary layer turbulence, which behaves as a liquid bearing that "lubricates" the main flow and wall of the intake--and reduces drag.
On a mirror smooth surface the speed of the fluid molecules is zero, as they stick to the surface, the passing molecules drag on these "stuck" molecules as they pass. On a roughned surface the turbulent boundary builds as a very thin layer of molecules recirculates between those that a stuck and the main laminar flow, reducing drag on the main flow.
This is why golf ***** have dimples, they would not fly half as far is they were smooth. It is also why pig-pong ***** seem to fly oddly; beyond that they do not weigh much, as their "spin" slows the boundary layer drag increases and they slow rapidly.
Forget 100mph fastballs too, if baseballs were smooth...
On a flow bench differences of 0.5 to 1.0%, between smooth and rough surface intakes are typical, and that is likely due to the slight enlargement of the passage ways caused by the polishing. Mirror finsh passages will always flow worse than rough finish if dimensionally idential parts are tested.
Google "porting and polishing myth" for more...