This is a cylinder head work discussion thread. Please post your thoughts and experience on head works such as valve job, porting, polishing and results of such. How does VE work, peak VE and whatnot. Can too much porting be bad?

Any personal attacks, or belittling posts will get deleted.

Let’s share our knowledge, in a sophisticated way.

 

I'll start with this....read through it to get the basic terminology down and a basic idea of porting a honda head.
http://www.theoldone.com/articles/d16a_head/
http://www.theoldone.com/articles/b16a_head/

With hondas its not about going in a making all of the ports bigger and making everything as shiny as possible. Its more about the corners of the short angle radius and getting the area just before (or just after depending on where you are looking at the head from) the valve seat to be smooth and flow nicely with the rest of the port. In stock form there is a bit of a lip, ITRs have this lip removed and grinded down smoothly (this is what passes as a factory port job, b/c there isn't much else done to the ITRs compared to the b16s). And of course, the ever so important valve job....if i were low on cash and building an engine, i'd at least get a solid 3 or 5 angle valve job done.
Its easy to make a honda head garbage, and anyone doing a backyard port job usually just makes a mess (from what i've seen). I wouldn't dare port a head without a flow bench, or years and years of experience porting honda heads (such as gord bush).
But if you ask me, DOHC VTEC heads flow pretty damn good in stock form, and i've seen some pretty impressive numbers put down while using a non-ported head.

 

nice links andrew...if people are serious about getting porting done they need to do alot of reading on www.theoldone.com period.

 

Too much porting can definately be bad charles.

The problem with Head work is alot of people think its as simple as buying a dremel from CrappyTire and Grinding away. Its almost a guessing game, Yeah you could do this and make better numbers... but it would be a total fluke, or you would have to be pretty lucky. What Zeeman is saying is totaly correct, you could get your head P&P at ABC's shop down the road and get it back and make worse numbers than when the head was in Stock form.

Is too much porting bad? Yes. If your porting the ports in the combustion chamber, if you dont know what your doing and you overbore it... or the port isnt true your going to have valve issues. And the valves wont seat properly in the Combustion Chamber.... infact i have pictures of this.... let me post.

I remember reading a really good thread on H-T about how important the angles of your valves are rather than just porting the head. Ill try and find it...

NICE links btw Andrew

 

If you notice on the bowls on the intake side (would be the ports at the bottem of the picture) See the inconsistancies.

Look at how the lip is perfectly polished on the exhaust side (Top of pic) Its a perfectly polished circle all the way around.

Sorry about the blury pic

Andrew.. i called you yesterday and it keeps saying that this cellular customer is not setup.. did you change your number to get away from my annoying calls?

 

the intake valves are on top exhaust is on the bottom

 

Fack... Im too lazy to edit. Thank you Steve.

 

so did you get the valve seats replaced and/or cut and the valves cut when you fixed your head just recently bryce?

With the valves and valve springs/retainers installed pour some brake cleaner down the intake ports and see if it leaks past the valve, if it does really bad, i'd get a valve job done.

P.S.
your picture sucks bryce, even after i fixed it up in photoshop.

 

How come whenever i say SORRY for a bad picture. I still get ripped on.

Its a VERY VERY Tiny leak past the valve. So i left it yeah yeah i know its going to be probs down the road. But hopefully ill have another motor built by then. With my .. crank less chewed up gsr block.

Im thinking Stroker Kit. . .

 

np....i downloaded some of your tunes off of limewire...do i owe you money now?

 

hahaha.



Im surprised you found them on limewire.

 

found 3 tunes...

find you
wasted away
so don't

not bad tunes...good work dude

 

wow! i guess they are on there.. ive heard about it.

Thanks Steve!

 

all the power is above and below the valve seat. if my memeory serves correctly....thats it, port volume is of little importance in terms of power production.

 

So increasing the flow of your head OR improving the flow path of your head has no importance in terms of power production? All that matters is "the power and below the valve seat" ?

You are CORRECT in saying that somtimes the volume is not of importance but the improvement of the flow pattern/path is more important this is true! But in a agressive setup the volume may be increased when air flow is restricted. In some cases port volume is DECREASED to make gains...

 

Heres a Great link.
http://en.wikipedia.org/wiki/Cylinde...ort_components

 

So how much would it cost to have a basic P&P and 3 or 5 angle valve job done to a b16 head?

The flow rate and valve seats are equally important. Gotta be able to keep up the flow rate, and seal the combustion chamber.

 

$1100 - $!400 plus taxes anything less is fishy.

 

what? believe me, port volume on Honda heads is of little importance, especially in 1.6-1.8L motors. one day you'll overstand facts vs. opinion. alot of people don't know where to make the power.....but, there are plenty of people out there that can ruin your head in less than an hour. in your defense, i possibly don't comprehend your comment. can you elaborate a bit?

 

^^MPower

What im saying is in a higher out put engine the port volume WOULD be important. IN some cases (on a agresively built setup) 1.8 / 1.6 engines port volumes could show some gains but isnt actually nessicary. IMO the way the head actually flows is far more important than the volume of air flowing.