OST-050 - A VERY special build

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oldeskewltoy
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OST-050 - A VERY special build

Postby oldeskewltoy » Thu Jul 05, 2018 11:40 am

Image



Image

Image

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-050 - A VERY special build

Postby oldeskewltoy » Thu Jul 05, 2018 12:18 pm

Some additional photos to later be used as reference for re-assembly.


Image Image Image
Image 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-050 - A VERY special build

Postby oldeskewltoy » Fri Jul 06, 2018 10:45 am

from another forum wrote:Care to share the plan for this beauty?




Well... a few things to point out.... a few of the pics showed Japanese text, and for those who were looking carefully they also saw no EGR, and they saw a MAP based EFI. So this engine is JDM.

But not just any JDM engine, this one is rather rare as this one was came from, and will be going back in..........

a Black Limited.........

(photo below edited)
Image


400 cars were produced. This rebuild... with a few tricks, will be going back into the Black Limited it came from.




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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Re: OST-050 - A VERY special build

Postby aukword1 » Fri Jul 06, 2018 12:31 pm

Very cool! Is this the engine that you need the bluetop cam covers for?

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oldeskewltoy
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Re: OST-050 - A VERY special build

Postby oldeskewltoy » Fri Jul 06, 2018 5:42 pm

aukword1 wrote:Very cool! Is this the engine that you need the bluetop cam covers for?


yes.......
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-050 - A VERY special build

Postby Rogue-AE95 » Fri Jul 06, 2018 8:28 pm

Number 50 is indeed something special :idea:
'88 Corolla All-Trac

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Re: OST-050 - A VERY special build

Postby oldeskewltoy » Mon Jul 09, 2018 5:12 pm

Rogue-AE95 wrote:Number 50 is indeed something special :idea:


;)



dismantling begins........

Each and ever piece coming off the engine gets tagged and bagged........ (some new parts also in frame)

Image



With the head off the block, it now goes out to get cleaned and checked, one thing is certain... this engine has 9.4:1 pistons. There is something else certain in this view.... ???

Image



bearing numbers noted... can you see which crank it has??

Image


.... and the head disassembled, nice looking cams....

Image




especially considering this...... now no more (except deburring the rest of the head)

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-050 - A VERY special build

Postby oldeskewltoy » Wed Jul 11, 2018 10:06 am

oldeskewltoy wrote:
(except deburring the rest of the head)




Intake side....

Image


The whole head....

Image

from another forum wrote:
... but they did (Germany) indeed get two versions: one leaded (gobbling up Super Benzin) and one unleaded variant with a catalytic converter...


https://www.banpei.net/wp-content/galle ... -small.jpg - third column second line down 124PS vs 116PS

oldeskewltoy wrote:I wonder......... the unleaded one - 9.4:1, the leaded one 10.0:1???



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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Re: OST-050 - A VERY special build

Postby oldeskewltoy » Fri Jul 13, 2018 2:54 pm

Been a while....

part of this build is a complete restoration of the engine back to the condition(appearance) it was 32 years ago. And in that vain I've notice that the block[s] I've worked never looked like they carried paint originally.... and apparently they DIDN'T!

From 2 very reliable sources I've found out that Toyota didn't paint their engine blocks back then, but had the blocks phosphate dipped, that is how Toyota treated the blocks. So in that vain, this block is getting a very similar treatment, the coating on this block will mimic the original, but be a bit harder, longer lasting.

Along with the blocks restoration, the head, including the entire intake, right down to the T/B, has been sent out to be soda-blasted. Once the head is back I'll begin the port work.

before....
Image

Soda blasting is similar to other surface cleaning(sand blasting, bead blasting) but is completely harmless and water soluble - cleans up with water. I'll have an after pic in about a week.


I did clean and test the AAV (warm-up valve under T/B)... it appears to work...

Image

with the block prepped for a new coating, and the head and intake off getting soda blasted... the internals wait on a familiar ;) shop cart...

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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Re: OST-050 - A VERY special build

Postby Rogue-AE95 » Fri Jul 13, 2018 4:19 pm

Are those stock rods with press-fit 18mm wrist pins? I can't remember if those 10:1 pistons had 18mm or 20mm pins.
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-050 - A VERY special build

Postby oldeskewltoy » Fri Jul 13, 2018 4:46 pm

Rogue-AE95 wrote:Are those stock rods with press-fit 18mm wrist pins? I can't remember if those 10:1 pistons had 18mm or 20mm pins.

The 10:1 pistons were available in BOTH 18mm, and 20mm wrist pins........


These are 18mm wrist pins...
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-050 - A VERY special build

Postby oldeskewltoy » Mon Jul 16, 2018 9:49 am

oldeskewltoy wrote:

These are 18mm wrist pins...




and a bit lighter too ;)

Image

I decided along with the new 10:1 pistons, that the light weight wrist pins will work nicely in this engine. The 23+ gram (nearly an ounce) saving will help allow the engine to accelerate/decelerate quicker, as well as lower the stress on the rod.


btw.....not sure anyone picked out the older design head gasket......... That type (from Toyota) hasn't been around in quite a while...



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-050 - A VERY special build

Postby oldeskewltoy » Wed Jul 25, 2018 11:32 am

Well... some good news, and some not so good news......

The not so good news first... The soda blasting was nearly a total waste of time, money, and energy. The manifold, t/b, and TVIS plates will all need to be glass beaded. :cry:

Glass beading means that the T/B, and the TVIS plates need to be completely disassembled prior to blasting to avoid the glass beads remaining and damaging the rotaional surfaces of these pieces. The AAV can not be fully disassembled, so I've been working with aluminum jelly to get the surface as "bright" as I can. Once the T/B come back, I'll see how close the two are to each other and "adjust" as needed.


I've recently found out that Toyota did not paint their blocks, but had them dipped into a black phosphate solution. This information comes from 2 highly reliable sources - one worked for TRD back in the early 1990s, the other is VERY well known to the Toyota, and 4AGE community.

So I spent a few days calling machine shops in and around the greater Portland area, and found no one doing phosphate dipping of engine blocks. There were a few smaller shops that did offer a black phosphate dip for hardware, but they couldn't physically dip, or coat the block. So with a phosphate dip out of the question, I found another solution...... :geek:

Image

This isn't flat paint, nor is it semi flat paint, in fact this isn't paint at all, it is far thinner then paint (.25-1.5 mils thick, vs 1.0-3.5 for most spray paints)


The only downside to this coating is its total curing time of 3 weeks!! :x



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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Re: OST-050 - A VERY special build

Postby Rogue-AE95 » Wed Jul 25, 2018 8:02 pm

Ceramic coating? If so, that should help the block shed heat.

I made the mistake of bringing a block to a local machine shop just for cleaning & inspection to make sure it was usable. I asked for it to be cleaned, and checked, but not painted... and got it back painted black. I wouldn't have minded if they had painted it silver, which is what I would have had done.
'88 Corolla All-Trac

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Re: OST-050 - A VERY special build

Postby oldeskewltoy » Thu Jul 26, 2018 8:48 am

Rogue-AE95 wrote:Ceramic coating? If so, that should help the block shed heat.



not ceramic......

Image

more of a 2 part epoxy...
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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Re: OST-050 - A VERY special build

Postby Rogue-AE95 » Thu Jul 26, 2018 4:19 pm

Interesting. I don't think I've seen something like that before.

And I don't think I've ever seen a 4A block with the "TEQ" logo before :idea:
'88 Corolla All-Trac

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Re: OST-050 - A VERY special build

Postby azndrifter50 » Wed Aug 01, 2018 11:03 pm

Keep it up! A very nice find and build!
Thanks,

Brian

Ae86 Ultimate
Master Mechanic and Master of the Custodial Arts
Los Angeles, CA

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oldeskewltoy
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Re: OST-050 - A VERY special build

Postby oldeskewltoy » Tue Aug 07, 2018 9:12 am

Rogue-AE95 wrote:Interesting. I don't think I've seen something like that before.

And I don't think I've ever seen a 4A block with the "TEQ" logo before :idea:


"teq" logo not that unusual on 3 rib blocks... - I've seen a few.


azndrifter50 wrote:Keep it up! A very nice find and build!



thanks!



finalllllllly... got the head, and manifold back............ remember, the "Before" views are after they were cleaned... "Before" just means before glass beading.


Exhaust side....

Image


Intake side....

Image



manifold - note the background lighting is far brighter in the before view....
Image


.... and its been 3 weeks for the block, so it goes back to the shop!!!



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-050 - A VERY special build

Postby oldeskewltoy » Thu Aug 09, 2018 2:43 pm

work begins.........

Image


a bit closer.....

Image


those same exhaust ports....

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-050 - A VERY special build

Postby oldeskewltoy » Tue Aug 14, 2018 9:13 am

A bit further....

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-050 - A VERY special build

Postby oldeskewltoy » Fri Aug 24, 2018 8:19 am

It has been a while... Had to finish up and ship the 1GG head out, but now work begins again on this head...


it was @ 1 down, 3 to go....

Image

Now @ 3 down 1 to go ;)


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-050 - A VERY special build

Postby oldeskewltoy » Wed Sep 19, 2018 8:29 am

I haven't forgotten about this build........

The head is now ported, and now has a fresh 3 angle - chamber volume are measured before machining.....

Image


and the volumes are.....

Image


So to get this chamber back down to about 36cc I'll have it machined .010". The block was decked .004", and I'm planning on using a .036" MLS gasket.



How much less distance (thousandths of an inch) will there be between the cams, and the crankshaft then there was originally?




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-050 - A VERY special build

Postby oldeskewltoy » Wed Sep 19, 2018 11:47 am

from another forum wrote:Roughly 0.025" or 0.64mm
Not too bad if you ask me and well within the adjustment of the tension pulley

Sent from my MHA-L29 using Tapatalk


What's a thousandth between friends.... :)

my #s: .005" + .010", + .011"(gasket difference)


Image

... and it appears to be a but under 2 degrees...



Is it retarded, or advanced??







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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