substitute for port and polishing???

[Dutchmalmiss]

a friend told me that you can paint the inside surfaces instead of port and polishing to smoothen the flowing throughout the motor. is that bs? he told me about a nascar driver doing that

[Halz]

'port and polish' goes further than just smoothing out the surface, it would increase the cross section of each port by removing material.. Using some sort of paint, or ceramic coating, or whatever, could smooth things out, but it wouldn't increase the cross section. If anything, it would reduce it.. and there is the risk that whatever is applied in the intake, comes off and takes part in combusting in the cylinder
...tell him that a formula one driver told you this :rolleyes: ;)

[AlligatorBling]

When I put a performance cam in my fourwheeler I did some polishing on the intake valve with fine grit sand paper, I got it smooth as glass... it wasn't that hard for me because my fourwheeler only has 2 valves for the entire motor (yamaha 350 warrior)... this might be more time consuming for a 16 valve motor, lol....

[Dutchmalmiss]

hmm...what's the difficulty in using the sandpaper?

[AlligatorBling]

not really difficult, just very time consuming

[king_johnthegreat]

If you've got mad dough, you send your intake manifold and head to be Extrude Honed. The process is simply an abrasive media pumped under extreme pressure through the passageways of the manifold and head. There different steps/media involved in bringing out the smoothest and most finished surface possible, but in the end, there is nothing that will rival its performance. You can even have the parts gasket matched, and choose how much material overall to be removed. The real benefit is how thoroughly and evenly the job is done. The most intracate manifolds no longer need to be cut in order to be polished, either. For those without the dough, there is Standard Abrasives. They offer very affordable deluxe port/polish kits with everything needed to complete the job. All you need is a drill, but air tools do the job much faster. They even include instructions on how best to do the job, and which tools are for what effect. I would recommend these processes in this respective order.
John

[AceInHole]

Originally posted by AlligatorBling
When I put a performance cam in my fourwheeler I did some polishing on the intake valve with fine grit sand paper, I got it smooth as glass... it wasn't that hard for me because my fourwheeler only has 2 valves for the entire motor (yamaha 350 warrior)... this might be more time consuming for a 16 valve motor, lol....
you want the intake port to be rough, to aide in mixing atomized fuel with air flowing through the intake (unless you have a GDI car like the new 7-series).
you want the exhaust ports to have a mirror finish, so that carbon deposits won't build up as easily.

Standard Abrasives offers their guidance online:
http://www.sa-motorsports.com/diyport.htm