OST-054: 3 rib with snap

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oldeskewltoy
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OST-054: 3 rib with snap

Postby oldeskewltoy » Wed Jan 09, 2019 3:17 pm

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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 :cry: 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 ruined the casting :evil: 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.

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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

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This head has been machined once as well

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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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User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1811
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-054: 3 rib with snap

Postby oldeskewltoy » Fri Jan 11, 2019 3:36 pm

from another forum wrote:what should the head size be if it hasn't been machined before?

116mm


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

Image


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

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


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!

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1811
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-054: 3 rib with snap

Postby oldeskewltoy » Sat Jan 12, 2019 1:47 pm

oldeskewltoy wrote:

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

Image



from another forum wrote:Short turns look beautiful.




and #3 and #2

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!

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1811
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-054: 3 rib with snap

Postby oldeskewltoy » Mon Jan 14, 2019 2:06 pm

Image


Intake side finished... on to the exhaust side 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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User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1811
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-054: 3 rib with snap

Postby oldeskewltoy » Wed Jan 16, 2019 10:10 am

oldeskewltoy wrote:
on to the exhaust side




3 down so far.....

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!

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1811
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-054: 3 rib with snap

Postby oldeskewltoy » Thu Jan 17, 2019 4:47 pm

oldeskewltoy wrote:3 down so far.....

Image




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

Image




and from a slightly different perspective...

Image




Next is getting the chambers deshrouded.....




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!

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1811
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-054: 3 rib with snap

Postby oldeskewltoy » Tue Jan 22, 2019 9:09 am

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



simple progression photo....

Image



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

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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