i want to know the benefits ?

also what are the disadvantages.

I am currently building h22

 

Add material to change port angle, fill in dead areas in port, shaping the short turn radius. It's different for each application.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Phil M &raquo;</TD></TR><TR><TD CLASS="quote">fill in dead areas in port</TD></TR></TABLE>

If its a dead area, stagnant, why fill it in at all?

 

to increase port velocity.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drift4jesus &raquo;</TD></TR><TR><TD CLASS="quote">to increase port velocity.</TD></TR></TABLE>
bingo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Phil M &raquo;</TD></TR><TR><TD CLASS="quote">bingo. </TD></TR></TABLE>

But its a dead area. Meaning, if you fill it in, the port doesnt "see" a decrease in CSA, how would velocity increase?

 

because the air is not fondling around in dead space anymore. it is pulled right through without misdirection(more velocity)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allnaturalb16 &raquo;</TD></TR><TR><TD CLASS="quote">because the air is not fondling around in dead space anymore. it is pulled right through without misdirection(more velocity)</TD></TR></TABLE>

So are the dead area's really dead/stagnant or are we experiencing tumble/turbulance/reversion here?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">

So are the dead area's really dead/stagnant or are we experiencing tumble/turbulance/reversion here? </TD></TR></TABLE>

exactly...turbulant air flow because that so called "dead" space is there. Dead referring to "too much" or "wrong" shape resulting in turbulance. which knocks down the velocity.

dead space i guess because it is killing your flow

 

Someone is thinking.

 

i love these threads .

keep it goign

 

as far as h22 i am not familiar with the cylinder head ports and would not be able to tell if you could benefit from this procedure.
also your build would definitely affect how much velocity is produced

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allnaturalb16 &raquo;</TD></TR><TR><TD CLASS="quote">as far as h22 i am not familiar with the cylinder head ports and would not be able to tell if you could benefit from this procedure.
also your build would definitely affect how much velocity is produced</TD></TR></TABLE>Well from what one porter has told me is that the floors of the h22 head should be raised up a bit in order to increase the velocity.

 

Brad from RLZ?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Professor15 &raquo;</TD></TR><TR><TD CLASS="quote">Well from what one porter has told me is that the floors of the h22 head should be raised up a bit in order to increase the velocity.</TD></TR></TABLE>

 

Several noted engine developers have stated this. I believe that the long turn side is a little too generous as well. Unless using oversized intake valves.

 

what is the price comparison between some welding and switching to oversize valves?

do oversize valves even completely solve the problem?

and..is there any advantage to running oversized valves? does it limit your cam selection?

like i said i have never even cracked open an H motor

and with a heavily modified motor (mainly big cams, but everything else also) does the turbulance seize to exist or become greater?

 

is the op even using this info?

he hasnt posted since the first post?

94vtirozguy where are you?

 

I see no reason for OS valves on an H street motor. Just my .02.

 

i have been reading the replies. Yes the h22 is going to be heavily built.

however i am not using oversized valves. The head welding is not a cost issue, just more of the upsaides and downsides of going the way of welding the head.

It will be driven on the street, however it will be going to the track as well. I am not running an off the shelf cam. i will get the specs tonight if that will help

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94vtirozguy &raquo;</TD></TR><TR><TD CLASS="quote">i have been reading the replies. Yes the h22 is going to be heavily built.

however i am not using oversized valves. The head welding is not a cost issue, just more of the upsaides and downsides of going the way of welding the head.

It will be driven on the street, however it will be going to the track as well. I am not running an off the shelf cam. i will get the specs tonight if that will help</TD></TR></TABLE>
You really need the head sorted out before you go and get cams ground,our H22a CRX that runs 10.83@123mph has NO port welding and use's std size valves and off the shelf cams,just my 2 cents worth.
Regards Dyno Dave

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dyno Dave &raquo;</TD></TR><TR><TD CLASS="quote">
You really need the head sorted out before you go and get cams ground,our H22a CRX that runs 10.83@123mph has NO port welding and use's std size valves and off the shelf cams,just my 2 cents worth.
Regards Dyno Dave </TD></TR></TABLE>

does that motor's head have porting or any type of valve grind? what has been done to it?

honda has very good designs and i cant really see a well built head needing welding until or maybe even before it is VERY built up beyond stock casting and parts involved.

and for the OP which porter says that welding should be done? if you can contact him i would like to see what and how the motor was built that he has seen this performed on and maybe a before and after. @10.83 do you really want .1 second for some welding? i cant see the welding helping much unless there really is a poor design in the h22 head