So I was talking to TurboKev and we were debating the S2000 cylinder. We are looking into porting, polishing ......... to get better flow with FI. I argued that a $3000 port and polish with valves..... wont net you much if you are evaluating on dollars per horse power. My feeling has always been to port the head myself. I bought a good book several years ago on porting and spent some time working with a local porter. I personally would not pay over a $500 to have a head ported based on the goals I want. I have found in the past there are only marginal gains between a mild port and wild port. The biggest differences are going to come from the mild port and oversized valves. In a mild port you will deshourd the valves, clean up the intake and smooth the exhaust then gasket match, all which an amateur can do safely. For a wild port the expert will know where they can remove material effectively and how far they can go. Don't get me wrong a professionally ported head will outflow the mild head but dollar for dollar unless you are racing the car competitively it is not worth it.


That being said, what do you think the F20/22 head needs and what have you done? Please feel free to share items like, valves, valve seats, valve angles, springs, spring seats, oringing...................

 

The f series heads are very efficient from the factory. That said it can be cleaned up some and oversized valves installed. I think sideways has one fs in the fs section or you could ask him about his experience.

 

Thats what sparked this discusion. $3k seems very steep in my mind but I am sure not everyone will agree.

 

did the port and polish myself and netted around 15hp NA.. dyno proved
i also ported the IM .. oversized valves arent that needed ..its good if you bore the block to bigger displacement..
Have no time to post pictures of the port..
Maybe later.
stefce

 

There is a lot more to ported heads than most realize. Bowl shaping is extremely important and it is easy to upset the flow with incorrect porting changes.

http://www.vtec.net/articles/view-ar...rticle_id=6500

 

I agree that it is more complicated in the Wild version. This is why CNC heads are so nice, once a head is developed they can for all entisive purpses make a perfect head. As your article states it is important to show an even flow and increased flow. My argument is based on $ / HP gained.

 

yeah i c where ur argument comes from but when you wanna push your kit to the limit and more a ported head will help you hit your power goals.

 

It all depends on your power goals and what engine safety you are looking for. You can gain the same hp as a 3000 dollar port job by turning the boost up 2 pounds, but if you are maxed out and are just looking to squeeze a few more out then you are going to have to go with a port.

 

[quote name='ChefJ' date='Jan 26 2009, 10:09 PM']It all depends on your power goals and what engine safety you are looking for.

 

^^^^ ughhhh... Let me tell you my situation.. I assumed the same thing that you are telling everyone..... 50.. 60.. 70.. hp increase.....

I just installed my ENDYN head and intake manifold that was supposed to net me 15-17% more power.... WELL.... lets just say... we installed the head (Looked great from the outside) and had my tuner mess around with the maps on the dyno! We did have to add a little bit of fuel to the midrange but nothing on the top end... After it was all said and done... we gained MAYBE 10rwhp...

I emailed larry and didnt get necessarily a straight answer, basically said cam position tuning would help etc...

So now I have 2500 invested in this head that is essentially doing nothing for me.... I am still on stock bore 87mm and can only go up to effective 8psi with my blower... thats it!!!

So when it comes to headwork... lets list some machinists that actually iknow what they are doing......

I still think ENDYN is a good shop even after I didnt gain anything... he seems like a smart guy... and his website is SUPER BAD ASS... but... I just didnt see the results....