Port polishing

[iH welker]

Just wondering what a port & polish job would cost on a 4 cyl.
Head ? Also looking for someone south of St. Louis mo. to fix one or any information where to send one !!!

 

[Little Big B]

(quoted from post at 02:45:55 11/24/12) Just wondering what a port & polish job would cost on a 4 cyl.
Head ? Also looking for someone south of St. Louis mo. to fix one or any information where to send one !!!

Give me a call, I've done numerous 4cyl IH heads with testing on a flow bench.
Derek Holdren 605 929 279seven

 

[buickanddeere]

Mirror smooth on the intake side is not a good idea. It flows less than a textured surface and puddles fuel.
They put dimples on a golf ball to disturb the airflow for a reason.

 

[iH welker]

Derek where you located ? I'm asking because my phones on the blinks it sounds like you can do what I'm looking for on my iH head!!

 

[ISEKI1610]

texture of a golfball is for resistance to air flow-to be able to hook or curve the flight. seams on a baseball are for the same reason. unlike a poolball which has table friction for hook,slice or curve. if your hit makes for centrifical spin then the airtraction will help distance,no divits on the spaceshuttle,or airplane nosecones.a perfectly propelled smooth has less resistance,but with the arch of swing,it's impossible to hit a perfect ball. the Question is what centrifical force is created in the airflow, unlike a gun which can be detonated and travel a perfect line. point of discussion is a multiple of side effects to be considered ( no wall has NO FRICTION 0r RESISTANCE. NEWTON's 2nd LAW of PHYSICS. Keep it simple polishining is always better than not.

 

[Little Big B]

(quoted from post at 21:24:04 11/25/12) Derek where you located ? I'm asking because my phones on the blinks it sounds like you can do what I'm looking for on my iH head!!

About 30mi north of Sioux Falls SD. What head are you looking to get work done too?
Derek Holdren

 

[buickanddeere]

Half true.
A mirror polish does not flow as well as a slightly textured surface.
And most certainly the puddling of fuel on a mirror smooth surface a textured surface . Is a factor in port to port fuel distribution. And bogging during throttle and rpm transitions when droplets of fuel instead of most/vapour flowing into the ports.
Vaporized fuel burns. Liquid fuel doesn't. The micro turbulence along textured port walls mechanically mixes and vaporizes the fuel.

 

[Anonymous-0]

(quoted from post at 13:08:26 11/27/12) Half true.
A mirror polish does not flow as well as a slightly textured surface.
And most certainly the puddling of fuel on a mirror smooth surface a textured surface . Is a factor in port to port fuel distribution. And bogging during throttle and rpm transitions when droplets of fuel instead of most/vapour flowing into the ports.
Vaporized fuel burns. Liquid fuel doesn't. The micro turbulence along textured port walls mechanically mixes and vaporizes the fuel.

a good test of this is to toss a glass of water on a slick finished concrete floor and observe the puddle . Now do the same on a broomed finished concrete floor and observe the puddles. Polishing does remove material and its the material removal that helps not the slick surface . Polishing aluminum pistons does help reflect the heat back into the cylinder even after carbon builds up .if you feel the need to polish thats were it pays off .

 

[buickanddeere]

Try blowing the water along the smooth and broomed/textured
floor with high velocity air flow.
The water on the smooth surface will run along in droplets .
The water on the textured surface will break up into an airborn
mist and vapour.

 

[bassndeere]

I've heard and followed this argument/discussion for many years. But all the input seems to be on liquid fuel, gasoline. What about adding LPG to the mix/discussion. It's a vapor already. Smooth or textured?

 

[buickanddeere]

LP fuel, polish all you want.