exahust port.


intake port.


combustion chamber.


'nother intake port.


spring.

 

Looks real nice.. Who did the work and what did it cost? Im looking to get some port work done myself.

 

looks very good....but only the dyno will tell!

 

Isn't the chamber/intake port smoother than one would want (for carbon and fuel atomization reasons?)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">Isn't the chamber/intake port smoother than one would want (for carbon and fuel atomization reasons?)</TD></TR></TABLE>

From what I can see, yes... Not saying that this head wont perform well because Ive seen heads with similar finishes on the intake side do quite well... Sometimes things that make sense dont always make sense :::shrugs:::

Im no export head porter but have ported a few heads in recent months... I always try and leave the intake ports with an 80 grit finish...

Exhaust ports, If I have the time/patience I finish with 120 grit and a flap wheel for the added "hey, I can see my reflection in there" silky smoothness

The work looks really good though, the ports seem to be fairly simetrical and there doesnt apear to be anything noticable to the eye that would give hint to an amature porter... Looks really mean very little in the actual performance of a head though... All you can really do by looking at a head is look for imperfections, theres no way to really judge the performance by eye...

 

Looks like Dpr's work

 

I wouldn't think it would be DPR's because the chamber is not blended into the valve job, most top pro porters would not let this go out the door like that.
And, if you put that head on a big turbo car you run the chance of cracking the head with the divider that thin and sharp. You would be ok with NA however.
Looks good!

Rick, I agree with you but I use 60 grit in most apps. 80 is cool to 120 on the exhaust but I suck using the flapper so I don't do it and I haven't seen a case where it benefited me to do so.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">Isn't the chamber/intake port smoother than one would want (for carbon and fuel atomization reasons?)</TD></TR></TABLE>

from what i understood i thought the same thing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">Isn't the chamber/intake port smoother than one would want (for carbon and fuel atomization reasons?)</TD></TR></TABLE>

 

Mine

His

 

Curtis does some mighty fine work there Tbone

 

Curtis did not port my head, Dpr did. Curtis only did a valve job, replaced the valves and then some flow work. He also lied about the flow #'s and the motor made more power with the valves being bent. I have given curtis this long to make good with me and send me my so called 300+ cfm flow sheets but he wont. So now i will let the cat out of the bag. So when you guys look on his site and see the pic of my combustion chamber, dont be fooled, curtis didnt do the head Dpr did. I asked him to remove the pic from his site and he didnt.
Thanks Curtis....for the 350 v job and an extra 210 to blend the seats and flow work.(which was never done) RFD

JimJustice is the real deal

 

Sorry to bring up a bad point Tbone.DPR does good work then also.Curtis seems like a nice guy,I'm sure he'll take care of you in the end.

 

ports get coated with carbon in no time, so the finish really isnt as important as some make it out to be. finish it with 60 or 600, its all gonna be carbon smooth in a matter of time. thats all i have to say about that.

the combustion chamber...yeah, could be better, could be smoother, but for the application im running it is more than sufficient.

i did the work...and im not even professionally trained.

 

The intake ports shouldn't get coated in carbon.

The combustion chamber is supposed to be rough as well, from what I rear.

 

From what ive heard is that a polished surface retains heat. So by polishing the hell out of the ex port keeps the heat in the port and keeps the head cooler. But thats just what ive heard

 

the intake ports will get carbon build up due to the overlap in the cams.

the combustion chamber should not be rough. this will prevent smooth intake/exhaust charge, reduce flame travel. you want everything to be fairly smooth, but it doesnt need to look like a mirror, cause carbon is gonna coat it anyway.

 

Why would overlap cause carbon to go INTO the intake ports?

At overlap the exhaust should be exiting and increase the vacuum from the intake ports. I honestly have yet to pull a head/IM and see carbon buildup on the walls of the intake ports. I have only seen oil residue (due to the PCV system) and gas residue (because of the injectors of cource).


Further, smooth finish on the intake ports causes the fuel to pool on the smooth surface and fall out of atomization.

 

how long have you ran an engine before you opened it up? an engine with 40,000 miles will have carbon build up at the top of the plenum, and it will also be evident on the back of the TB butterfly.
open the hood on your dads car/truck, pull back the intake plastic, and wipe your finger on the back of the butterfly, ill put emoney down your finger comes out black.

smooth ports will cause the fuel to pool? maybe you are right, in one sense. all you need is 3 dimples on the intake port to disrupt the fuel spray, making sure atomization will occur.
in race engines, true race engines, laser injectors are ran. laser injectors spray on the back side of the valve, causing the fuel to atomize closer to the cylinder, and cool the valve at the same time. the ports on such an engine could be so smooth, an ant would slide off the sides.

now, i didnt post pics of my IM, so no one on this board can be certain of my setup. i could have my injectors sitting in such a manner as to where i dont need to worry about atomization even on a daily driven application.

 

The "carbon" you speak of is oil buildup due to the PCV system recirculating blowby vapors into the intake manifold. Its not carbon, which is a byproduct of combustion. And with the right catch can system, you can eliminate the oil buildup, which is obviously optimal.

3 dimples on the intake port (ie: the endyn trick) is not going to be a substitute for a proper intake port surface. That is more for transient response, than WOT fuel atomization.

 

[QUOTE

smooth ports will cause the fuel to pool? maybe you are right, in one sense. all you need is 3 dimples on the intake port to disrupt the fuel spray, making sure atomization will occur.
in race engines, true race engines, laser injectors are ran. laser injectors spray on the back side of the valve, causing the fuel to atomize closer to the cylinder, and cool the valve at the same time. the ports on such an engine could be so smooth, an ant would slide off the sides. [/QUOTE]

Laser injectors huh? I want to see a pic of a "laser" injector. I guess alot of cylinder heads have laser injectors because most manufactures place the injector facing the back side of the valve.

 

the only way an engine would not get a carbon build up is if it ran 100% volumetric efficiency throughout the rpm band. but since an engine doesnt run at 100% throughout its rev band, you get intake reversion, which results in spent gas (carbon) entering the intake manifold.
i know all about positive crankcase vents, and how they bring "oily air" into the intake flow because it is a smog necessary part...been to class, learned that. but what im talking about is beyong a simple pcv part.

"a lot" of cylinders dont spray fuel on the backside of the valve. a b16/b18c-r IM places the injectors so that they spray more towards the port floor. a laser injector sprays a line of fuel onto the backside of the valve, meaning the flat, valve itself, right at the base of the stem. in fact, the ports are more up/down than a daily driven engine, which gives the intake charge a more direct path to the cylinder.
take a formula 1 v10 engine for example. the intake ports are straight, pointing to the sky, or in actuality, to the variable velocity stack which has a laser injector placed in the very center. if you could draw a line from the center point of the injector downwards, you would see it intersect with the valve, the backside, at the base of the stem, to be more precise.

 

Not being able to fully fill the cylinders is not directly related to reversion.

And again, every head I have pulled has NOT has carbon in the intake ports, and the intake ports were still rough to the touch. And this is on engines that have had upwards of 150k miles.

 

dpr heads

 

whatever style, you win. carbon absolutely, positively never enters the intake side of the engine.

i guess im on my way to tell my professors they are full of ****, they dont know ****, but some kid on honda-tech knows all.