Im curious which companies are offering head porting and their price.

With the LNF being Direct injection we don't need to worry as much about turbulence in the intake manifold or runners so we should be able to port the living crap out of the head and intake as well as install a bigger throttle body with little adverse effect.

What are every ones thoughts on this. I think ZZP ported their head and gained almost 50HP.

 

^^thiis

 

Im not sure about the ported head. But I know they tested a larger TB and saw little to no gains.

 

changing the throttle body only isnt going to make much gains on any 4 cyl car. porting the head tho will definently increase airflow much much better.

 

I used to do some minor hand porting on eclipse motors. the awesome 4g63!!!!! but I mainly would just gasket match and go from there. I know one of the big draw backs from porting to much on a port injection engine is the mixture of air and fuel that occurs in the intake runners.
Well with DI it mixes in the combustion chamber. so we should be able to port almost as much as we want. Here is my reasoning.

Air flow is relative to CFM and PSI. So 25PSI in a 2inch pipe does not equal 25psi in a 3inch pipe.

That was actually a big deal with the DSMs. you didn't want to go bigger than 2.5 inch pipes or your psi would be to low to make usable power.

So if we opened the head up and the intake / throttle body and went to 3inch pipes with a larger turbo we could run the same or less PSI and make more power.

From what I have read PSI kills our pistons/rings and not CFM. So if we can open the air ways we can run the same PSI and get more power in return.

 

hmmm. makes me wonder. if were able to port our heads reallly well, what kind of power could be had with the stock turbo.

 

I would love a ported head!, sounds like a winter job! Also I think that a bigger tb gives your more of a gain on an sc rather than a tc.

 

I'm pretty sure zzp did some messing around with porting the LNF head and got mixed results. I don't think they ever flow-bench tested the head (stock or ported) to see exactly how much more or better it flowed over stock.. although I could be wrong on that part

 

if you port the lnf head, dont expect a turn key solution unless you have a degree in thermodynamics

direct quote from matt at zzp...

"We found that the combustion of the direct injection is seriously affected by altering the airflow into the cylinder. Basically, auto makers spend millions of dollars to get the injection pulse placed just right and the incoming air has a serious affect on it. While we can gaurantee big airflow improvements, the tuneability is decreased and combustion is not as efficient.

-Matt "

basically, you can get more flow into the chamber, but power gains would be negligible, and streetability would most likely be ****. But i am not speaking from experience, im only piggybacking off of what matt said, so if you wanna try, please go prove him wrong

 

I would think you would probably need to have a bigger turbo to see gains on either

 

ok so I hadn't heard that part from ZZP that they found that it messed with the combustion. Well that really sucks then because that was one of the way everyone gained about 30-40hp from the eclipses. Guess 20year old tech won't translate to 5 year old tech.

On that note then the only real way for the Lnf to gain power is to increase boost then along with cam timing etc. that a pretty big short coming in my mind. I guess its time I changed my plans from built LNF in 5 years to LS2

 

it will eventually believe me...

The next generation small block chevy is right around the corner, and guess what type of fuel system is used?

You got it, Direct Injection... if you want to make a lot of money, learn how to port a DI head, and then sell it to the vette guys in a few years

 

they do have head porting kits on ebay...

 

i know an easy way to port your head. it works on hondas. you just take a bag sand (the same **** u use to sand blast stuff) and put it in your intake while the car is running. itl port your head AND exhaust. double win!!!11!!1!one!!

 

Wasn't that a youtube video? Or was it on a forum?

 

yep, its from a forum

 

Yeah that was a great forum post just like this one So, Dont buy a VW - Honda-Tech

I always get my wheels off that way

 

yaaaa

 

[QUOTE=redcomet303;5257879 Guess 20year old tech won't translate to 5 year old tech.[/QUOTE]

Direct injection has been around since the 1940s on diesel engines. Honestly I'm surprised its taken this long to make the transition to gas. Being that you can tune the fuel amount very precisely it is very performance friendly. In the older style diesels all you had to do was crank up the pump and you got as much power as you wanted. The ported heads on diesels don't add alot of power either. Because they use such high boost.

We use quite alot of boost, especially tuned, for a gas motor. The lower pressure but high CFM probably doesn't fill the cylinder the same way, which I imagin is the problem is the problem.

And the Audi forum thing was almost as funny as a mustang forum guy who ran water through a hose into the fill cap on the valve cover to "flush out" the old oil from the oil pan... WHILE IT WAS RUNNING!!!