HI all. I am almost completely done gutting out an H23 intake manifold for my 91' accord. Here is the results,




I used a jig saw and some rotory cut off wheels. What I need to know now is what I can use to polish the manifold (not the runners). I found this kit on the online action site (ebay lol) for a good price. Will this do the job or is it made from the wrong materials? It claims its for polishing metal,



http://www.ebay.com/itm/130391083317...84.m1497.l2649


Will they work?

 

Those will not work well on your manifold. They look like soft metal/jewelers polishing tools.

You should be looking for cartridge roll abrasives with 80-120 grit.

Standard Abrasives


You should be able to find smaller 5-10 piece kits at your local hardware or auto parts store for $10-$15.



You cut those divides really low.... your going to want to do a lot os smoothing on those square edges.

What did you do with the IAB plate and upper plenum? Did you gut them as well?

 

Same with the plate and the plenum, I did cut them out.

Are you sure those won't work? Thing is those abrasives don't look like I can manuver them very well, unlike those burrs I posted.

Using a jig saw allowed me to cut them that low. It was a hassle but it worked out once I got the . Its 2x as powerful as the dremel and half the price.

Those bits wouldn't fit the tool I have. Its 1/8".

I posted were for,

-Rotary tool accessories, felt-tipped, 12 pieces.
-Smooth and refine surfaces by using these felt buffs to polish metal, ceramics and glass.
-Ideal for smoothing interior surfaces, there are twelve interchangeable pieces for the rotary grinding and polishing tool.
-Kit includes: 4 flat cylinder felt burrs, 3 cylinder pummel felt burrs, (1) 10mm echelon felt burr, (1) 10mm reversed echelon felt burr, 2 triangle felt -burrs and (1) 10mm kettledrum felt burr.
-All with 1/8" (3mm) Mandrel



What about these?



I know what you're probably going to say. The sand paper bits are the best. thing is the ones I have are short and stubby, not long like the ones in the pic. The ones you posted are for die grinder probably... Guess I'll just have to find some for the rotary tool.

Would have liked to use an alternative method though.

 

I told you what I have been using for the past 5 years without any issues. if you can find something that works better for you go at it!

If I can get in and work in an area the size of an intake port I think you should be ok moving about in that hole.

 

Nice work Ghost,
And I agree with you the sandpaper flap wheels
are whats needed, the felts are fine to finsh
with

 

Check out the build log in his signature, the thing is beautiful.

 

Yeah that does look gnarly. I heard though that you don't wanna port the runners cause you want turbulance for the air/fuel to mix. I'd imagine this is true.


that looks almost too good for you to have only used the sandpaper wheels, are you a sorcerer or something?

 

maybe for an old carb'ed motor where there is actually fuel in the runners, but on port fuel injected engines like the ones being discussed you really want to avoid turbulence right up to the point where the air and fuel enter the chamber.

he must be, those look like magic!

 

The top 4 intake port pictures are all finished with 80 grit cartridge rolls. The bottom one is a polished exhaust port. I used cartridge rolls to get it started then went up to 2000 grit by hand.


As stated above.... Turbulence is not required in a multi-port fuel injection manifold. The fuel is pretty much sprayed at the backs of the valves.... the fuel doesn't drop out of atomization as people try to tell you it will..... that is old carb, feeding fuel to your engine from 25" away, shyte!

You still want to keep it rough enough to maintain a small boundary layer to promote quick air movement. The key there is to try and keep it as uniform and consistent as possible!