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Old 12-28-2012, 02:00 PM   #1
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Cool Porting the 99/00 BP head

This is the same head casting from this thread.
https://www.miataturbo.net/engine-pe...pection-70069/

The customer is building for boost, and wanted some porting done.

What the stock head looks like down the runners.



The tools used.

No! Fae... You can not use a sawzall for this!!

Setting the head to start on the roof of the runner.


A 50/50


Getting the roof and divider rough into shape.


The burrs were loading up with aluminum.
This happens with some heads, but not all.


I added some cutting fluid to the burr, I get a cleaner cut now.


Roughing the bowls into shape.




Smothing the bowls some
Attached Thumbnails
Porting the 99/00 BP head-img_1621.jpg   Porting the 99/00 BP head-img_1625.jpg   Porting the 99/00 BP head-img_1627.jpg   Porting the 99/00 BP head-img_1632.jpg   Porting the 99/00 BP head-img_1628.jpg  

Porting the 99/00 BP head-img_1631.jpg   Porting the 99/00 BP head-img_1633.jpg   Porting the 99/00 BP head-img_1635.jpg  
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Old 12-28-2012, 02:25 PM   #2
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Loving this info and pictures. Thank you.

Subscribing.
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Old 12-28-2012, 02:32 PM   #3
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I'm working on a spare head at home now. This is inspiring to say the least.

Looking back through your older threads again, I really enjoy the new camera too.
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Old 12-28-2012, 02:36 PM   #4
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Any chance there is a flowbench in the shop?
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Old 12-28-2012, 02:41 PM   #5
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What should I expect to pay for "some bowl work" and what are some of the cheap, easy things to do for an NA engine?
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Old 12-28-2012, 02:51 PM   #6
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Very nice work; but why don't the manufacturers start with this shape in the first place and just leave it rough vapor honed? Castings wouldn't cost any more, would they? And look at the metal they would save.....
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Old 12-28-2012, 03:03 PM   #7
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Quote:
Originally Posted by 18psi View Post
Loving this info and pictures. Thank you.

Subscribing.
Glad you are enjoying them!

Quote:
Originally Posted by Miater View Post
I'm working on a spare head at home now. This is inspiring to say the least.

Looking back through your older threads again, I really enjoy the new camera too.
I am a little better set up than the avarage home DIY'er for porting.

You can Thank Aaron for handing me a better camera, and givin me a lesson on how to use it.!

Quote:
Originally Posted by EO2K View Post
Any chance there is a flowbench in the shop?
<<<<---- Like the one in my avatar pic??? lol
Ill have to get a new base, and make an actuator.

The base I have is 4" one side and 4.250 on the other, doubfull I would get an accurate reading with it.

Ill look into Getting a proper sized base so I will be able to flow decently.

Quote:
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What should I expect to pay for "some bowl work" and what are some of the cheap, easy things to do for an NA engine?
The cheap and easy would be mill the head to get the compression up.

Some bowl work would help, but the casting is so rough in the runners, they need smoothed too,

Welcome to the rabbit hole... care to fall in????

On a NA engine, I would not work the bowls as heavy, there is no need for it, but getting the velocity up would help.
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Old 12-28-2012, 03:21 PM   #8
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Quote:
Originally Posted by BogusSVO View Post
<<<<---- Like the one in my avatar pic??? lol
Ill have to get a new base, and make an actuator.

The base I have is 4" one side and 4.250 on the other, doubfull I would get an accurate reading with it.

Ill look into Getting a proper sized base so I will be able to flow decently.
You sneaky bastard!

I'm not sure I've ever seen anyone post back-to-back numbers for hand porting on a BP. Hopefully you can get your base together before you rip through all the ports.
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Old 12-28-2012, 03:22 PM   #9
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Thanks. I'm not falling into a rabbit hole, I've done that. I'm trying to get a Miata back on the road and it looks like I'm going the junkyard route.
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Old 12-28-2012, 03:29 PM   #10
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Quote:
Originally Posted by olderguy View Post
Very nice work; but why don't the manufacturers start with this shape in the first place and just leave it rough vapor honed? Castings wouldn't cost any more, would they? And look at the metal they would save.....
The tool used to create valve seat has a big guide that creates the big step in the bowl. Ever seen a K20 port. That is how a company that obsesses over specific engine output more that how it handles, does their heads. FWD + Superbike ports or race car suspension design + head design that needs to wear a helmet.
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Old 12-28-2012, 03:32 PM   #11
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Quote:
Originally Posted by emilio700 View Post
The tool used to create valve seat has a big guide that creates the big step in the bowl. Ever seen a K20 port. That is how a company that obsesses over specific engine output more that how it handles, does their heads. FWD + Superbike ports or race car suspension design + head design that needs to wear a helmet.
When I see an OEM Honda head, I cry a little.
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Old 12-28-2012, 03:52 PM   #12
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Quote:
Originally Posted by olderguy View Post
Very nice work; but why don't the manufacturers start with this shape in the first place and just leave it rough vapor honed? Castings wouldn't cost any more, would they? And look at the metal they would save.....
They want to crank them out fast in production. The car makers will do what they can to shave .01 per unit, so another step in maching, all adds to the cost, in labor and tooling.

I doubt when the engineers that designed the head for the BP, even considered bolting a turbo to it, it was all about MPG.


Quote:
Originally Posted by EO2K View Post
You sneaky bastard!

I'm not sure I've ever seen anyone post back-to-back numbers for hand porting on a BP. Hopefully you can get your base together before you rip through all the ports.
I doubt that, But I have another head on the shelf I will try to flow befor I set it up on the porting table.


Quote:
Originally Posted by hustler View Post
Thanks. I'm not falling into a rabbit hole, I've done that. I'm trying to get a Miata back on the road and it looks like I'm going the junkyard route.
Thats understandable, at a min, have the basic checks done on the head before you bolt it into place.
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Old 12-28-2012, 03:57 PM   #13
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Quote:
Originally Posted by emilio700 View Post
the tool used to create valve seat has a big guide that creates the big step in the bowl. Ever seen a k20 port. That is how a company that obsesses over specific engine output more that how it handles, does their heads. Fwd + superbike ports or race car suspension design + head design that needs to wear a helmet.
+100
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Old 12-28-2012, 06:00 PM   #14
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Quote:
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Thats understandable, at a min, have the basic checks done on the head before you bolt it into place.
Well, my machinist won't buy a tap to make sure the threads are good on my spark-plug hole so he expect me to pay money for the rebuild (if the valves are bent), then diagnose the spark plug hole problem. I can't dump $700+ into new valvetrain into a bad core, so I'm not really sure what to do at this point. Maybe time to give up.
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Old 12-28-2012, 06:05 PM   #15
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Default Exhaust side

Looking down the exhaust runner, stock
Working the roof and divider of the runner.

Keep in mind the head is upside down.




Getting it rough in, and thinning the divider a little bit.



I can only port for about an hour or so at a time, keeping controll of the grinder is key.
Attached Thumbnails
Porting the 99/00 BP head-img_1636.jpg   Porting the 99/00 BP head-img_1637.jpg  
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Old 12-28-2012, 06:31 PM   #16
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Lets say I wanted to mess around with a trash head, what does a decent set of bits like these cost? Where to buy?
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Old 12-28-2012, 07:04 PM   #17
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Quote:
Originally Posted by hustler View Post
Well, my machinist won't buy a tap to make sure the threads are good on my spark-plug hole so he expect me to pay money for the rebuild (if the valves are bent), then diagnose the spark plug hole problem. I can't dump $700+ into new valvetrain into a bad core, so I'm not really sure what to do at this point. Maybe time to give up.
That dosen't sound right, I could understand $40-50 to teardown and inspect the head and estimate write up, if you decided not to go through with the rebuild, or if the casting is beyond repair.

But not wanting to spend $25-$30 on a spark plug thread chaser????
Last tool on right


$700? That must be a full ST valve and spring kit w/Ti Retainers.

The machinist you are using must be too busy, or not intrested in doing your head build.

Quote:
Originally Posted by doward View Post
Lets say I wanted to mess around with a trash head, what does a decent set of bits like these cost? Where to buy?
Oh decent carbide burrs will run from $30 -$100+ each, depending on make, shape, length.

Then a porting kit with mandral and cartarage rolls is another $30-$60

On porting this head I have used 3 diffrent burrs.
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Porting the 99/00 BP head-img_1638.jpg  
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Old 12-28-2012, 09:17 PM   #18
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Exhaust bowls roughed in

Now the intake and exhaust runners and bowls are all roughed in.

Looks a bit ugly at this point.


Time to pretty it up a bit.
Getting the roof and divider smoothed out.


Now the bowl blended into the runner.
Attached Thumbnails
Porting the 99/00 BP head-img_1638.jpg   Porting the 99/00 BP head-img_1641.jpg   Porting the 99/00 BP head-img_1640.jpg   Porting the 99/00 BP head-img_1643.jpg   Porting the 99/00 BP head-img_1639.jpg  


Last edited by BogusSVO; 12-29-2012 at 05:37 PM.
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Old 12-28-2012, 09:25 PM   #19
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If I can find a cheap head, I may give this a go myself. I have some junk valves to work on the chamber too.
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Old 12-29-2012, 08:08 AM   #20
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I have no pictures from my portwork, but some flow numbers
Quote:
Originally Posted by NiklasFalk View Post
I have numbers from my VVT head stock and worked.
The flow values are at 10" water, CFM wet air followed by dry air.
Code:
Intake Port Original   Intake ported 34.0mm
 1.0mm   16.2  16.4     19.7  20.0
 2.0mm   35.7  36.3     41.0  41.7
 3.0mm   51.4  52.2     59.3  60.2
 4.0mm   69.8  71.0     75.3  76.6
 5.0mm   84.8  86.2     91.1  92.6
 6.0mm   99.6 101.3    105.6 107.3
 7.0mm  108.8 110.6    117.1 119.1
 8.0mm  114.9 116.8    126.2 128.2
 9.0mm  118.1 120.1    133.2 135.4
10.0mm  120.7 122.7    138.0 140.3
11.0mm  122.3 124.3    141.7 144.0
12.0mm  121.4 123.4    145.0 147.4
13.0mm  121.5 123.5    145.6 148.0

Exhaust Port Original  Exhaust ported
 1.0mm   12.5  12.7     12.5  12.7
 2.0mm   27.0  27.5     29.3  29.8   
 3.0mm   44.3  45.0     48.0  48.8 
 4.0mm   60.5  61.5     65.1  66.2  
 5.0mm   77.8  79.1     82.5  83.9
 6.0mm   89.8  91.2     92.2  93.8   
 7.0mm   95.9  97.5     98.0  99.7   
 8.0mm   99.1 100.7    102.8 104.5 
 9.0mm  100.9 102.     105.7 107.5 
10.0mm  102.7 104.4    109.9 111.8  
11.0mm  104.1 105.8    113.3 115.2 
12.0mm  105.2 107.0    115.9 117.8 
13.0mm                 118.2 120.2
You can "convert" the number to 28" H2O (e.g. Airflow Conversion Table, a factor 1.67)
No real need to work the exhaust much for a NA build, but going to three angle grind removed a vortex on the exhaust side and increased flow somewhat (words from my builder, I'm just learning to appreciate the knowledge).
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