OST-064: Breathing on a 3 rib

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oldeskewltoy
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OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Fri Jan 31, 2020 4:00 pm

Image



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

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oldeskewltoy
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Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Mon Feb 03, 2020 8:43 am

OST-064 "Cleaned"....

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After getting it cleaned, I deburred the casting

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And then before porting, I had it "tumbled" so the head now looks new, no discoloration do to oils, carbon, or coolants.

Image

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-064: Breathing on a 3 rib

Postby oldeskewltoy » Thu Feb 06, 2020 1:01 pm

Work begins.... One done...


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and a bit closer...

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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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oldeskewltoy
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Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Tue Feb 11, 2020 7:41 am

oldeskewltoy wrote:
Image



more to come.... :D



Image



Image


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2 down....

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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aukword1
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Re: OST-064: Breathing on a 3 rib

Postby aukword1 » Tue Feb 11, 2020 10:06 am

Great work as always! Quick question though, what does "tumbling" the head consist of? Is it similar to tumbling bullet casings?

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oldeskewltoy
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Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Wed Feb 12, 2020 7:52 am

aukword1 wrote: what does "tumbling" the head consist of? Is it similar to tumbling bullet casings?


Not sure (tumbling bullet casings...???) What "tumbling" means in this case is they have a large tool - it consists of a large cabinet, with a rotisserie that you strap the head too. The cabinet is closet, and it tumbles inside the cabinet. The media used is cast zinc shot.


a bit further yesterday..... 3 down....

Image



and an up close view inside on the exhaust side....

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!

aukword1
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Re: OST-064: Breathing on a 3 rib

Postby aukword1 » Wed Feb 12, 2020 11:16 am

Ah, thanks for the clarification. It's actually very similar to tumbling bullet casings for reloading ammunition except its a different type of media used. Very cool!

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oldeskewltoy
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Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Fri Feb 14, 2020 6:40 pm

oldeskewltoy wrote:
Image




4 down....

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
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Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Wed Mar 11, 2020 3:07 pm

and the internals.......

Image



crank on right has wankered key groove in snout

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
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Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Wed Mar 18, 2020 5:32 pm

everything is back in my hands for final assembly....

head, with fresh valve job (machined .008")...

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along with assembled short block - those are Molnar Tech 40/20 H- beam rods

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Does anyone see the remnants of a problem in the deck???

It took a great deal of decking to get the block suitable to accept a metal gasket.... so much so that our deck is now .018" (piston above the deck!)

Image

The "fix", Cometic C4166-051, that should set the squish back to .033", or just a tick above .8mm.......


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-064: Breathing on a 3 rib

Postby oldeskewltoy » Wed Mar 25, 2020 8:20 am

[QUOTE=oldeskewltoy;1110545]
along with assembled short block - those are Molnar Tech 40/20 H- beam rods

Image


More to come..... :D[/QUOTE]

Did(Do) you see it????

How about if I point it out.......

Image

A little extra clearance at the bottom of the bores to make sure the new rods clear during rotation


As often happens when you mix valves from one head, with a different head... and new cams......

Image

Getting the valves tipped so that they are in the middle of my shim bank sizes so I can set valve clearance to the thousandth(.001")


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
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Posts: 1999
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Wed Mar 25, 2020 8:22 am

oldeskewltoy wrote:along with assembled short block - those are Molnar Tech 40/20 H- beam rods

Image


More to come..... :D


Did(Do) you see it????

How about if I point it out.......

Image

A little extra clearance at the bottom of the bores to make sure the new rods clear during rotation


As often happens when you mix valves from one head, with a different head... and new cams......

Image

Getting the valves tipped so that they are in the middle of my shim bank sizes so I can set valve clearance to the thousandth(.001")


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: 1999
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Thu Mar 26, 2020 10:53 am

a nice 3 angle valve job... and back cut intake valve......

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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Rogue-AE95
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Re: OST-064: Breathing on a 3 rib

Postby Rogue-AE95 » Fri Mar 27, 2020 5:47 pm

I didn't realize those Molnar 40-20 rods required modifying the block. I had bought a set years ago from Orion, but I never used them.
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Thu Apr 02, 2020 7:46 am

Rogue-AE95 wrote:I didn't realize those Molnar 40-20 rods required modifying the block. I had bought a set years ago from Orion, but I never used them.

Not always... Loynings made clearance before.... as that is easier then finding out during assembly



fresh hone....

Image


and with the Cometic gasket fitted... NOTE: the front, and rear placement for the oil feed(front), and oil drain (rear)

Image


and with the head fitted

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: 1999
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-064: Breathing on a 3 rib

Postby oldeskewltoy » Fri Apr 03, 2020 3:10 pm

A step further....

Image


Doing a bit of custom fitting... the stock lower timing cover will not accommodate the T3 pulley snout (its broader - more diameter than stock), so the lower timing cover is "adjusted" so it will accommodate the T3 pulley

Image

Image


Once that detail is taken care of, the rest of assembly goes smoothly

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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If you see this text you are blocking our ads.
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