OST-034: Noir Crowning

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oldeskewltoy
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OST-034: Noir Crowning

Postby oldeskewltoy » Tue Jul 28, 2015 9:10 am

:mrgreen: - A package gets dropped at my door.......


Image

No one has told me they sent me anything.....


I open up the box.... it's a head, that much is pretty obvious (size, mass)... but it is well disguised


Image


I manage to remove the tape and get most of the shirts removed... one thing is certain... its 20V....

Image

the heads chambers have been taped over... but a view @ the ports reveal.....

Image

We have a Blacktop head... I've been talking with a client for about 6 weeks concerning his blacktop head... he never did tell me it was on the way...


OST-034: Noir Crowning aka Blacktop ;)


Image

More to come...... :mrgreen:
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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trigun402
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Re: OST-034: Noir Crowning

Postby trigun402 » Tue Jul 28, 2015 7:04 pm

Yes, another head to watch. :)

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marin86
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Re: OST-034: Noir Crowning

Postby marin86 » Tue Jul 28, 2015 10:45 pm

I enjoy your work. Look forward to watching this one

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Thu Jul 30, 2015 10:27 am

thanks guys........... :D


so once unwrapped and set up on the bench.... inspection begins....

Over all the casting quality has gotten much better. Although there still is port-bowl-seat shift, the shift amount - at least in this head, is minimal.

There is one REALLY, and I mean REALLY odd ball bit........ the 3 intake valve seats have NO semblance of an even 3 angle...

Image


Looking into the Blacktop service manual the 3 angles are suppose to be 30, 45, 60. Well the throat cut - 60 degree cut, in essence is the bowl angle and so the back of the port (highest pressure area) has no effective throat cut, while if you look carefully, the throat cut at the short radius is so small, it also becomes more or less insufficient... and the the throat cut between the two... is nothing short of an extreme change - from a width @ the back of the port of almost 5mm, to the width at the short radius of the port of less than 1mm.


I'll been inquiring with a few people as to the best way to address this....

One thing is certain - the factory put a lot more effort in to making the bowls and seats as smooth a transition as the factory could do... the bowl machining marks you see are not by me... those are all factory machining


Adding some more info....

The heads thickness measure.....

Image

My dial caliper is likely off by .001"


and getting a chamber volume

Image


and it is very close to SamQ's 37.8cc measurement.... I'm closer to 38cc

Image



Further inspection......

Image

shows a few issues on the exhaust side... look @ those casting marks.... as they travel from the bowl to the port. Also the small "step" in the machining/casting hurts flow, especially at lower lifts.




More to come........ :mrgreen:
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Mon Aug 03, 2015 6:25 pm

oldeskewltoy wrote:There is one REALLY, and I mean REALLY odd ball bit........ the 3 intake valve seats have NO semblance of an even 3 angle...

http://ost.ebeans.ch/albums/userpics/10005/intake_3_angles_-_throat_cut_offset2.jpg


I'll been inquiring with a few people as to the best way to address this....

One thing is certain - the factory put a lot more effort in to making the bowls and seats as smooth a transition as the factory could do... the bowl machining marks you see are not by me... those are all factory machining



I've spoken with a few people concerning the oddly shaped seats, Although oddly shaped, the back cut will aid filling, and so it should remain.... and it shall





I begin on #4, since the bowls already merge pretty well with the seats, my biggest task is a to "build" a short radius, to minimize the intake guides, and guide bosses, and to gently straighten port/bowl mismatches.

Image

#4 is on the left... you can also see where I've done some mild blending, in the chamber, of the factory machining marks.




And to the exhaust on #4(left).... I seem to remember the info "out there" saying the Blacktop had 35mm exhaust port outlets.... I measured these, they come in around 33.6 ish mm.

Image

The ported one is about 33.75mm..... besides the re-taper, I've also "rebuilt" the shape of the guide bosses to minimize their effect on flow past them. I've also added a minor radius to the exhaust guides to further minimize flow disturbances

The view from the chambers...
Image


Image
With #4 mostly finished(right)... #3 has been cleaned, and #2(left) is still a bit "carbon coated". As I did with the SR20 head, I'll be doing with this one. I'll be mounting this on the flowbench a bit later this week so that I can test the 3 chambers/sets of ports all on the same day, and under the same conditions. This will allow me to quantify the port work.


more to come..... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Tue Aug 04, 2015 9:01 am

from another forum wrote:That said, it will be interesting to see the tool you conjure to actuate the valves during flowing.


thank you for your contribution.... :)

Image




additionally.... I've made a casting of a port before... and after....

Image


it will help me see the "positive" of my porting/removal. Kinda like these....

Image



more to come........ :mrgreen:
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Wed Aug 05, 2015 8:58 am

Image

Image

Image
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

PDB
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Re: OST-034: Noir Crowning

Postby PDB » Wed Aug 05, 2015 12:32 pm

Nice idea [emoji106]


Sent from my iPhone using Tapatalk

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Thu Aug 06, 2015 8:33 am

I got a request........

Image


More to come.... :mrgreen:
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Tue Aug 11, 2015 3:24 pm

Image


the intake side.....
Image

paper towel in exhaust port is acting as a "cork", remember these are used valves, in used seats, and stuffing the opposite port to the one being test allows for honest figures.




The numbers @ 28".......


Unported Intake -
  • .050 - 58.15
  • .100 - 110.87
  • .150 - 146.30
  • .200 - 168.30
  • .250 - 180.08
  • .300 - 186.65
  • .350 - 191.22
  • .400 - 194.10

Ported Intake -
  • .050 - 60.02
  • .100 - 114.30
  • .150 - 149.20
  • .200 - 177.33
  • .250 - 185.47
  • .300 - 192.33
  • .350 - 197.78
  • .400 - 202.35

There is a glaring error on one reading, can anyone find it??? I likely over adjusted one valve, What should it read (about/approximate)??


setting up to do the exhaust side
Image



Unported Exhaust -
  • .050 - 32.45
  • .100 - 65.52
  • .150 - 90.95
  • .200 - 110.12
  • .250 - 122.80
  • .300 - 130.25
  • .350 - 135.48
  • .400 - 140.43

Ported Exhaust -
  • .050 - 35.38
  • .100 - 65.88
  • .150 - 93.73
  • .200 - 113.50
  • .250 - 130.63
  • .300 - 139.92
  • .350 - 146.33
  • .400 - 151.20


More to come...... :mrgreen:
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Mon Aug 24, 2015 11:18 am

Nearly a 2 week delay...

I had a talk with my client, he is hoping for an exhaust to intake flow ratio approaching 80%. This is going to be extraordinarily difficult because the stock Blacktop flows about 61%, and the first attempt at porting the exhaust side did improve things, now 67%, but a further gain of 13% seems a long goal at best.

My first attempt at porting the exhaust was limited because I didn't have a gasket to know where my edges were, and I didn't want to port beyond the gasket, for doing that would cause serious flow issues. So the initial porting on #4 exhaust was from about 33.6 to about 33.7, because not knowing the exhaust gasket left me a bit in the dark.

My client sent me the OEM gasket

Image

Port on far right is #4, even with the gasket in the "down" position, there is still some room available in the port roof, and room all the way around the port.

So now that I had a gasket, work begins on #2 exhaust port. Redline is the gaskets edge.



Image


A bit more dramatic....

Image



The stock Blacktop gasket outlet is 36mm. Port #2 is now out to 34.8mm

Image



Later this week I'll get this on the bench and see what if any improvement there is over the first numbers.


More to come........ :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Thu Aug 27, 2015 12:35 pm

oldeskewltoy wrote:Image

Later this week I'll get this on the bench and see what if any improvement there is over the first numbers.

The numbers @ 28".......

Ported Exhaust (#4 - port on left) -
  • .050 - 35.38
  • .100 - 65.88
  • .150 - 93.73
  • .200 - 113.50
  • .250 - 130.63
  • .300 - 139.92
  • .350 - 146.33
More to come...... :D



"New" exhaust port readings, #2 port - on right
  • .050 - 34.98
  • .100 - 65.03
  • .150 - 93.67
  • .200 - 113.32
  • .250 - 131.88
  • .300 - 142.53
  • .350 - 150.92

The reason testing stopped @ .350 was my client is limited to 9mm of lift (.354")



So now the intake @ .350" is @ 197.8cfm, while the exhaust is now @ 150.9, the exhaust to intake flow ratio is now a tick over 75% at peak lift, and over the lift range the exhaust to intake ratio is now about 71.5% (was 61%)


More to come..... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Thu Sep 03, 2015 4:54 pm

a few views of working the exhaust side.....


minimizing the guide boss, and tapering the guide - both to minimize their effect on the outgoing exhaust flow
Image


reshaping the exhaust port - maximizing flow
Image


3 ports down.... one to go
Image



more to come..... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

trigun402
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Re: OST-034: Noir Crowning

Postby trigun402 » Thu Sep 03, 2015 9:40 pm

All the hard work and time. So much of it.

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Tue Sep 08, 2015 9:27 am

trigun402 wrote:All the hard work and time. So much of it.


I try........

Image
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Tue Sep 08, 2015 4:34 pm

Image

Image



Now to finish up the intakes and the chambers....


More to come....... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Fri Sep 11, 2015 2:46 pm

#2 on left and #1 on the right

Image

On the intake side all I did was knock back the guides, and guide bosses, and made the bowls round to fit/follow the valve seats.... OH I also added a very gentle short side radius.... and opened up the bowls a bit as well.

Image

Here we are with 4 chambers, 4 exhaust ports, and 3 intakes finished... it got a bit too hot today, so I'll finish on Monday.

Image



More to come.... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-034: Noir Crowning

Postby oldeskewltoy » Tue Sep 15, 2015 11:31 am

oldeskewltoy wrote: OH I also added a very gentle short side radius.... and opened up the bowls a bit as well.





Image

and a bit closer of a view of the worked short radius compared to the unworked side
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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