View Full Version : Porting my KA24DE head (pix)

07-30-2005, 12:51 PM
Thought I'd show some pics of my new project motor.

07-30-2005, 12:57 PM
Chamber #1

07-30-2005, 01:00 PM
Intake #1 polished

07-30-2005, 01:03 PM
Exhaust #1 polished.

Is it wrong I get a stiffy when I look at this?

07-30-2005, 01:29 PM
Looks good... wanna do the heads on my Maxima engine? They're even already out of the car. ;)

07-30-2005, 05:54 PM
dibs on the next port job by thunder chicken!

07-30-2005, 10:01 PM
I might do a few on the side from time to time.:D

Here's a few before pics.

07-30-2005, 10:17 PM
Exhaust stock

07-30-2005, 11:22 PM
what is the benefit of this kind of polishing? and does it have to be perfect or just kinda smooth?

07-31-2005, 07:18 PM
I've always been told for the combustion chamber & exhaust side runners you want a near mirror finish to resist carbon build up & prevent hot spots.

On the intake side you want a smoother then stock finish, but not too smooth, to keep some kind of turbulence & so fuel won't puddle in the runners.

I also shave down the valve guides to help expediate more flow.


07-31-2005, 09:20 PM
sure ... good enough answer for me ... so it doesn't have to be perfect then ? what did you use to grind it down?

07-31-2005, 09:35 PM
Does it have to be perfect? As long as you stick with the basic shape & design of the area your working on, you'll be fine. Every guy that does this kind of work is not attempting to re-engineer, or correct the original design. Only to smooth & transition what mass producing a head has left behind.

I use a carbide steel cutter, aluminum dioxide grinding stones for material removal & shaping. Standard abrasives 80 & 120 grit cartridge rolls for smoothing & polishing.

Final polishing I use fine grit cross buffs fo' that pimpn' bling finish!

How are those MR coilovers doing?


07-31-2005, 09:59 PM
they are workin better now that I think I have them setup right. I'll find out just how good they are working no the 6th at auto-x .... you should try it sometime .. it's a blast

07-31-2005, 11:36 PM
yeah, just getting rid of the casting flaws from mass producing these things. ive also heard that a mirror finish will also cause the fuel sticking to the sides. well done, sir :devillook