OST-054: 3 rib with snap
01-10-2019, 01:07 AM
Post: #1
OST-054: 3 rib with snap
[Image: AEU86 AE86 - OST-054: 3 rib with snap]


OST-054's owner is "local" (no shipping). The first head he brought to me, back in early December, had seen an "attempt" at changing the squish pads Crying He had bought the head a few years ago as the one he would build - he wasn't too happy once I showed him the flaw

At this time I'd like to STRONGLY recommend that if you "try" to port a head, and you don't know what you are doing... STOP. In the past 3 years I've bought 3 heads that had to be scrapped because of very poor "attempts"..... that runied the casting Facepalm If you are going to try... just make sure that head isn't sold on.......


So my client disassembles his engine to get me his current head... and it too has seen a hand inside it. On this one it wasn't "fatal"..... the roof of the port has seen some "work"... along with a lot of "smoothing" inside the exhaust port.

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


This type of work (tapering port roof) I try to reserve for ITB equipped heads to try and and match the angle of the ITB adapter. In this case some care was used by the previous "porter" so that this head could be re-used.

disassembled, prior to cleaning

[Image: AEU86 AE86 - OST-054: 3 rib with snap]



This head has been machined once as well

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


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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01-11-2019, 07:00 PM
Post: #2
OST-054: 3 rib with snap
what should the head size be if it hasn't been machined before?
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01-12-2019, 01:34 AM
Post: #3
OST-054: 3 rib with snap
(01-11-2019 07:00 PM)kazi Wrote:  what should the head size be if it hasn't been machined before?


116mm


work begins..... #4 on the left...

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


Oh... as the title states... this is a 3 rib, and my client manage to find a set of high comp TVIS pistons 13103-16030, the same pistons I used in OST-050.

[Image: AEU86 AE86 - OST-054: 3 rib with snap]

His short block is being built at a local machine shop - with my technical assistance.


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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01-12-2019, 11:46 PM
Post: #4
OST-054: 3 rib with snap
oldeskewltoy Wrote:work begins..... #4 on the left...

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


from another forum Wrote:Short turns look beautiful.



and #3 and #2

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


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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01-15-2019, 12:08 AM
Post: #5
OST-054: 3 rib with snap
[Image: AEU86 AE86 - OST-054: 3 rib with snap]


Intake side finished... on to the exhaust side 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
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01-16-2019, 08:10 PM
Post: #6
OST-054: 3 rib with snap
oldeskewltoy Wrote:on to the exhaust side

3 down so far.....

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


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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01-18-2019, 02:47 AM
Post: #7
OST-054: 3 rib with snap
oldeskewltoy Wrote:3 down so far.....

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


and now the exhaust side is done.....

[Image: AEU86 AE86 - OST-054: 3 rib with snap]




and from a slightly different perspective...

[Image: AEU86 AE86 - OST-054: 3 rib with snap]




Next is getting the chambers deshrouded.....




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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01-18-2019, 08:06 PM
Post: #8
OST-054: 3 rib with snap
Not sure if I didn't pay enough attention the last many times or did you get a lot faster?

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AE86 ex-daily
[Image: AEU86 AE86 - OST-054: 3 rib with snap]
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01-22-2019, 07:07 PM
Post: #9
OST-054: 3 rib with snap
(01-18-2019 08:06 PM)Bean Wrote:  Not sure if I didn't pay enough attention the last many times or did you get a lot faster?

Sent from my MHA-L29 using Tapatalk

not really faster.... In this case I waited till I got the head back from the machine shop after cleaning to begin posting.



oldeskewltoy Wrote:Next is getting the chambers deshrouded.....

simple progression photo....

[Image: AEU86 AE86 - OST-054: 3 rib with snap]



and a little before and after before it gets its 3 angle

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


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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01-28-2019, 07:03 PM
Post: #10
OST-054: 3 rib with snap
[Image: AEU86 AE86 - OST-054: 3 rib with snap]


the head is back... briefly... so I can check and set chamber volumes....

[Image: AEU86 AE86 - OST-054: 3 rib with snap]

Now it is back @ the machine shop about to get .016" taken off to set the chamber volumes @ 35cc. A 35cc chamber, along with the proper squish should net my client a static compression ratio of about 11.0:1.


Mix in a set of Cat cams 252/222 8.5mm lift cams, and this engine should pull (make power) to low/mid 8000s


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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