OST-068: Smok'n
05-06-2020, 03:03 AM
Post: #1
OST-068: Smok'n
[Image: AEU86 AE86 - OST-068: Smok'n]


OST-068 is a smok'n Blacktop, its burning oil.....

[Image: AEU86 AE86 - OST-068: Smok'n]



particularly from #4 exhaust valve (wet exhaust port)

[Image: AEU86 AE86 - OST-068: Smok'n]



Why is it smoking???

1 too many valve seals........... Sad He is lucky that the extra seal didn't cause any damage other then burning some oil

[Image: AEU86 AE86 - OST-068: Smok'n]


My client was a little embarrassed, but it was decided he wanted more power anyway, AND besides those seats(2nd photo in post - above), and valves (below)....

[Image: AEU86 AE86 - OST-068: Smok'n]

....have seen better days, so I'm building another 20V engine. Wink




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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06-01-2020, 10:31 AM
Post: #2
OST-068: Smok'n
So what's the plan for this engine overall?
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06-01-2020, 10:36 PM (This post was last modified: 06-02-2020 12:15 AM by oldeskewltoy.)
Post: #3
OST-068: Smok'n
(06-01-2020 10:31 AM)decryphe Wrote:  So what's the plan for this engine overall?


The plan...

the bottom end of the engine gets a complete rebuild, with new Toyota 81.5mm Blacktop pistons, rings, and new bearings. Additionally the bottom end will get fully balanced. The deck height will be set to provide a squish: minimum of .032" (max of .036").

The head has already (previously) been machined .004", I'll be taking about .004" to drop chamber volume about 1cc from before all machine work.

The chambers in this head are the best I've seen in any of the Blacktop heads I've worked - No chamber work will be needed Thumbs up!

Now as nice as the chambers are... some of the ports are not so nice.

poor port alignment (core shift) here

[Image: AEU86 AE86 - OST-068: Smok'n]


and here....

[Image: AEU86 AE86 - OST-068: Smok'n]



Fixing said poor alignment

[Image: AEU86 AE86 - OST-068: Smok'n]


and showing a comparison of 2 intake ports - before and after work

[Image: AEU86 AE86 - OST-068: Smok'n]



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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06-03-2020, 09:19 PM
Post: #4
OST-068: Smok'n
3 down........

[Image: AEU86 AE86 - OST-068: Smok'n]


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
06-04-2020, 09:11 PM
Post: #5
OST-068: Smok'n
It's so clean! Respect!

1982 - TA60 Carina 4dr sedan - fun cruiser
1983 - AE86 Sprinter Trueno - import project
2013 - Honda Civic sport - daily driver
2004 - AEU86 dot ORG - daily domain

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[Image: AEU86 AE86 - OST-068: Smok'n]
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Yesterday, 09:47 PM
Post: #6
OST-068: Smok'n
so... its been a while since I've updated... build is almost finished, just waiting on the new Cometic .036" 20V gasket.





old, and dirty, and look at the pock marks in the exhaust seats

Quote:[Image: AEU86 AE86 - OST-068: Smok'n]

port work complete - prior to valve job - exhaust seats still pock marked if you look closely

[Image: AEU86 AE86 - OST-068: Smok'n]


4 angle(exhaust), along with ground valves with back cut intakes

[Image: AEU86 AE86 - OST-068: Smok'n]

a bit closer view

[Image: AEU86 AE86 - OST-068: Smok'n]



Head is ready for re-assembled using Supertech springs

[Image: AEU86 AE86 - OST-068: Smok'n]


and as always... it requires small tools (tweezers required)

[Image: AEU86 AE86 - OST-068: Smok'n]




the bottom end got oversize(81.5mm) pistons, and a complete re-balance

[Image: AEU86 AE86 - OST-068: Smok'n]


along with a new MRP oil pan

[Image: AEU86 AE86 - OST-068: Smok'n]


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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