OST-062: Mixed Breed Autocross Whip
11-16-2019, 06:22 PM (This post was last modified: 11-16-2019 06:23 PM by oldeskewltoy.)
Post: #11
OST-062: Mixed Breed Autocross Whip
not a huge fan of 2nd gen largeport heads....... the flaws in this one are(were) pretty bad.... Sad

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]


The 2nd gen castings don't seem to have the same port alignment as the earlier heads.... not saying that all the early heads are good... just that the later gen seems to have more "bad" ones....



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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11-18-2019, 03:52 AM
Post: #12
OST-062: Mixed Breed Autocross Whip
a more familiar view.....

1 down... 3 to go.....

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]


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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11-18-2019, 08:25 PM
Post: #13
OST-062: Mixed Breed Autocross Whip
When I disassembled this engine, I had a real rough time removing the rear exhaust side head bolt. Once "broken" loose... it wasn't loose, it required me using the ratchet AND lifting the head at the same time to get the bolt free from the block. Once the head was free, the bolt had to be "gently" hammered free of the head using a drift. That head bolt may(likely) will need to be replaced. Special attention is being paid to making sure the threads inside are clean, and true

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]

So, the blocks surface back in that area is significantly "damaged", and a healthy block decking is in order to get the block true. Anticipate as much as .012" to be removed...........




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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Yesterday, 11:32 PM
Post: #14
OST-062: Mixed Breed Autocross Whip
from another forum Wrote:That .012" might work well enough. I found a lot, if not most, aftermarket pistons are machined for a .010" lower compression height. That's for a good clean up on the block.

We shall see.... Cometic has soo many different thicknesses, it should be no problem setting squish between .032", and .036"


Further progress on the head.... 2 down......

intake....

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]


exhaust....

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]


Chambers....

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]




Working short radius for #4 intake valve

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]




before and after (apologies for fuzzy after pic) both bowls ported, and chamber deshrouded

[Image: AEU86 AE86 - OST-062: Mixed Breed Autocross Whip]



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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