OST-034: Noir Crowning
08-06-2015, 05:27 PM
Post: #11
OST-034: Noir Crowning
I got a request........

[Image: AEU86 AE86 - OST-034: Noir Crowning]


More to come.... Hurray!

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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08-06-2015, 05:53 PM
Post: #12
OST-034: Noir Crowning
Oh man.... sweet..!
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08-06-2015, 06:19 PM (This post was last modified: 08-06-2015 06:21 PM by Bean.)
Post: #13
OST-034: Noir Crowning
Is it just me or does the 16V benefit more from porting than 20V regarding flow benefits?

AE86 ex-daily
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08-12-2015, 12:31 AM
Post: #14
OST-034: Noir Crowning
(08-06-2015 06:19 PM)Bean Bandit Wrote:  Is it just me or does the 16V benefit more from porting than 20V regarding flow benefits?

lets see.......

[Image: AEU86 AE86 - OST-034: Noir Crowning]


the intake side.....
[Image: AEU86 AE86 - OST-034: Noir Crowning]

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: AEU86 AE86 - OST-034: Noir Crowning]



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...... Hurray!

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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08-24-2015, 08:20 PM
Post: #15
OST-034: Noir Crowning
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: AEU86 AE86 - OST-034: Noir Crowning]

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: AEU86 AE86 - OST-034: Noir Crowning]


A bit more dramatic....

[Image: AEU86 AE86 - OST-034: Noir Crowning]



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

[Image: AEU86 AE86 - OST-034: Noir Crowning]



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........ Big Grin

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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08-26-2015, 11:53 AM (This post was last modified: 08-26-2015 11:53 AM by banpei.)
Post: #16
OST-034: Noir Crowning
That's a lot of area you gained! Huh

1983 - AE86 Sprinter Trueno - import project
2013 - Honda Civic sport - daily driver
2004 - AEU86 dot ORG - daily domain

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08-27-2015, 09:47 PM
Post: #17
OST-034: Noir Crowning
oldeskewltoy Wrote:[Image: AEU86 AE86 - OST-034: Noir Crowning]

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...... Big Grin


"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..... Hurray!

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
Find all posts by this user
09-04-2015, 01:46 AM
Post: #18
OST-034: Noir Crowning
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: AEU86 AE86 - OST-034: Noir Crowning]


reshaping the exhaust port - maximizing flow
[Image: AEU86 AE86 - OST-034: Noir Crowning]


3 ports down.... one to go
[Image: AEU86 AE86 - OST-034: Noir Crowning]



more to come..... Hurray!

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
Find all posts by this user
09-08-2015, 06:33 PM
Post: #19
OST-034: Noir Crowning
[Image: AEU86 AE86 - OST-034: Noir Crowning]

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
Find all posts by this user
09-09-2015, 01:36 AM
Post: #20
OST-034: Noir Crowning
[Image: AEU86 AE86 - OST-034: Noir Crowning]

[Image: AEU86 AE86 - OST-034: Noir Crowning]



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


More to come....... Hurray!

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
Find all posts by this user


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