Headwork... DE vs HR flow testing
08-24-2009, 07:54 AM
#1
Headwork... DE vs HR flow testing
So here is a thread for those of us that are considering headwork on our VQ's. This is what I am having done to my heads and I will share a general cost (your cost may vary, I'm a repeat customer) and the before and after comparison flow test so you can decide if this mod is worth your duckets.
https://my350z.com/forum/forced-indu...gress-101.html
Posted by Dave @ HeadGames
http://www.headgamesmotorworks.net/
ok...finally some pics for your viewing pleasure! Waited on parts for a bit...
This is how a valve job is performed. Valve job is being performed on a Sunnen SGM1500 seat and guide machine. This machine is what most ProStock shops switched to a few years back. Most of you I am sure have never seen some of this stuff, so feel free to fire questions off.
The Sunnen machines are a fixed pilot machine, meaning the pilot is fixed into the valve guide and the machine centers off of it. This is the pilot with spring
This is a cutter body, and the cutter that makes the valve job. You have heard the 3 angle, 5 angle valve jobs...you can get all 3 or 5 on one cutter or 3 or 4 and make the other angles yourself with cutters.
This is the intake being cut
this pic illustrates the finished angles on the left and no so finished on the right. We are doing this on a stock size valve. Take note, the area under the valve is crucial to flow, as much as the angles. Blending by hand is surely needed to get this right. Going to a oversize valve exasperates this, and few get it right. Bigger is not always better!
this is a typical radius cutter...note the top angle, the 45 or "seat" angle and the radius.
stock exhaust seat....
Radius seat...
Next up...blending, lash, milling and flow testing!!!!!!!!
https://my350z.com/forum/forced-indu...gress-101.html
Posted by Dave @ HeadGames
http://www.headgamesmotorworks.net/
ok...finally some pics for your viewing pleasure! Waited on parts for a bit...
This is how a valve job is performed. Valve job is being performed on a Sunnen SGM1500 seat and guide machine. This machine is what most ProStock shops switched to a few years back. Most of you I am sure have never seen some of this stuff, so feel free to fire questions off.
The Sunnen machines are a fixed pilot machine, meaning the pilot is fixed into the valve guide and the machine centers off of it. This is the pilot with spring
This is a cutter body, and the cutter that makes the valve job. You have heard the 3 angle, 5 angle valve jobs...you can get all 3 or 5 on one cutter or 3 or 4 and make the other angles yourself with cutters.
This is the intake being cut
this pic illustrates the finished angles on the left and no so finished on the right. We are doing this on a stock size valve. Take note, the area under the valve is crucial to flow, as much as the angles. Blending by hand is surely needed to get this right. Going to a oversize valve exasperates this, and few get it right. Bigger is not always better!
this is a typical radius cutter...note the top angle, the 45 or "seat" angle and the radius.
stock exhaust seat....
Radius seat...
Next up...blending, lash, milling and flow testing!!!!!!!!
08-24-2009, 10:29 AM
#4
Thanks Chris!
ok...after the valve job is completed this is what your left with. Now, just a FYI this is not true from anyone who does a valve job. This particular valve job takes a lot of material out in the bowl area, meaning not all valve jobs are created equal. The angles and widths of the angles change or vary from job to job and so does the work involved to make them a enhancement versus just a status ques. This is where flow bench work comes in, and the knowledge of how different angles effect the air.
what your looking for is the material left behind from the bowl cut. It is a angle cut that will be blended into the short side and bowl area. It's the shiny part towards the guide
We take a grinder with a carbide bit to blend it in by hand. Surely not something your local speed shop usually has the knowledge to do correctly..in this arena, it can make or break the gain you could see. Too much and it flows like big cup and too little is like a straw. And their is even some that when blended it doesn't work as well. This is where a flow bench comes in handy!
And this is a side by side comparison...
Same is done to the exhaust side...this helps blend the bowl into the radius, so it is a radius from the short turn to the chamber.
It's then sanded with a 60grit cartridge roll...finished product
next up....lash!
ok...after the valve job is completed this is what your left with. Now, just a FYI this is not true from anyone who does a valve job. This particular valve job takes a lot of material out in the bowl area, meaning not all valve jobs are created equal. The angles and widths of the angles change or vary from job to job and so does the work involved to make them a enhancement versus just a status ques. This is where flow bench work comes in, and the knowledge of how different angles effect the air.
what your looking for is the material left behind from the bowl cut. It is a angle cut that will be blended into the short side and bowl area. It's the shiny part towards the guide
We take a grinder with a carbide bit to blend it in by hand. Surely not something your local speed shop usually has the knowledge to do correctly..in this arena, it can make or break the gain you could see. Too much and it flows like big cup and too little is like a straw. And their is even some that when blended it doesn't work as well. This is where a flow bench comes in handy!
And this is a side by side comparison...
Same is done to the exhaust side...this helps blend the bowl into the radius, so it is a radius from the short turn to the chamber.
It's then sanded with a 60grit cartridge roll...finished product
next up....lash!
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08-24-2009, 08:01 PM
#10
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See! Right there is an example of why HeadGames deserves their own thread! If this was integrated into Cass's thread we'd have more than likely not have been blessed with the link to such a beauty! (the girl ain't that bad either!)
Ahaha
Darren
Ahaha
Darren
08-25-2009, 12:04 PM
#15
Dave does awesome work and you've made a wise, well informed choice! I'm running HeadGames heads on three cars I currently own, G35, EVO, and STI - all of them have produced crazy gains...!
See Dave at work here...
And yes, Dave's hands really do move that fast, no camera tricks or video speed increasing...
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See Dave at work here...
And yes, Dave's hands really do move that fast, no camera tricks or video speed increasing... <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/timSs9XsiEA&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/timSs9XsiEA&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
Last edited by Philthy; 08-25-2009 at 12:06 PM.
