I've done alot of searching and reading on ht and d-series but I'm not really coming up with the answers im looking for. . .

i used my IM and ex gaskets and marked the ports so I know what to remove. . .

on the ex side - looks like I need to remove alot
on the IM side it looks like I barely need to remove anything. . . ???

I read that your not supposed to remove material from the floor of the port. . . is this true for in <U>and</U> ex?

I'm kind of not sure how much is too much and how little is pointless. . . I kind of feel like I'm just scraping off a thin top layer. . . .


I don't want to ruin my only head that has just been machined but I also don't want to waste time if what I'm doing isn't really going to make a differance. . .

 

Please don't attemp this....this takes alot of experience to get even close to right.

 

you basically need to port it out so it makes the air flow smoother....for instance, it wont do much good to port out the sides and top necessarily without shaping the bottom to cohede with airflow....

the whole idea is to make the engine be able to take in more air. thats pretty much it. as long as it flows better rather than worse.

and i just made no sense. get a bigger grinding wheel, 40 grit i think it is to start with, then progressively move to finer grinds, then polish it out.

check it out.....these guys know their stuff...look at the shine....
http://m24x.zeroforum.com/zero...age=1

 

well I have already started . . . all I've done is enlarged #1 and 2 exhaust ports. . . so I will atleast have to enlarge the other two to match. . . should I only being doing the top and sides? or bottom too?

 

you kind of have to look at the way air is being pulled in from the intake manifold...try to visualize the air flowing in from the runners, and look at the head itself...then try to picture what areas are blocking airflow, and would allow more air to pass if they were removed...

i started to port my b16 head with ITR mani, and the sides of the head were a little narrower than the mani, so i widended them up some, and took some off from all around. not sure if it helped or not yet, where its a new build, but im pretty sure the air will flow much smoother now.

its also important to make sure that the head and mani are matched, so the edges wont restrict the passage.

 

I have never ported a head my self but Im pritty shure you need to leave some of the edge's, just check it out before you hack it up. try to find some old picks of people's port work for refrence.

 

cool - thanks alot - I'm port matching right now and just smoothing things out and cleaning it up a bit - nothing major - just a little bigger than stock

 

yeah your supposed to leave the in side relatively rough and the ex should be smoother. . . right now im on the exhaust - it's a pretty time consuming project - but thanks for the info guys

 

go to that link and look at those ports....thats how you want them to look....

IM Rocket or MAXCFM about it, they can give you good pointers on it.

 

yeah i think mine looks pretty good - but no where near that good

 

those guys are hardcore....i try to talk to rocket as much as possible just to get as much taken in as i can...

 

&lt;---(Shaking head)

 

haha....i wish c-speed had a factor on their compression ratio for millage...

 

well had to run out and get a mask because of all the dust - but the ex is pretty much done - i basically just port matched and smoothed it out a bit - i'll try to get some pics up here in a little bit

 

well i dont know how to post pics but i got a couple

 

dude hook it up.....

 

so you already enlarged the ex. ports? in wich way did you enlarge them?
where?

so could seriously fak some **** up, ask the water passages


Modified by mmuller at 2:17 AM 3/19/2005

 

hmmm....where did that come from???

 

I port matched intake and ex. then opened up the exhaust ports just a little and smoothed them out real good. nothing major just a little cleanup work

someone tell me how to post pics and i'll get some up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by soLSvtec12kcraze &raquo;</TD></TR><TR><TD CLASS="quote">haha....i wish c-speed had a factor on their compression ratio for millage...</TD></TR></TABLE>Just subtract it from the head gasket thickness.

 

improving on flaws is always good; smoothing out, blending throats, blows, etc.
now on for porting..i would not realy mess with it.
did you take out material out of the port floor? short turn radius?


dont go wild or you gonna pierce the water passages


Modified by mmuller at 2:22 PM 3/19/2005

 

Check out this link for an awesome N/A D series build!!! https://honda-tech.com/zerothread?id=1139538 It may give you some ideas about DIY porting.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tjbizzo &raquo;</TD></TR><TR><TD CLASS="quote">Just subtract it from the head gasket thickness. </TD></TR></TABLE>

word, but then how would i compensate for cc volume....?

Bojangs says to add .1 of compression for every .010 milled.....

12.5:1 is right where i want to be...

 

no, on the intake side i just matched the opening (to match my gasket) and ex i did the same with a little smoothing and blending. that's about it, i decided against the serious port as this is a mostly street car (little auto x)

 

it cant do anything but help right??