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
Find all posts by this user
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
Find all posts by this user
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
Find all posts by this user
11-19-2019, 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
11-21-2019, 02:37 AM
Post: #15
OST-062: Mixed Breed Autocross Whip
from another forum Wrote:Looking at that engine compartment again. Is there a reason for using a turbo manifold?? Clearance issues? Wouldn't a stock Corolla mani do a better job?


I BELIEVE a tube header can be made, but nothing available will fit. The Datsun uses a worm and roller type steering, and the steering arms (pitman arm, tie rod sections, and center link) interfere with anything off the shelf. While not desirable, this seems to "work".



3 down..........

intake...

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


exhaust...

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



and chambers......

[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
11-26-2019, 01:37 AM
Post: #16
OST-062: Mixed Breed Autocross Whip
from another forum Wrote:Maybe a FWD mani would do better, with the way turns back into the block would give the clearance to the steering box. At least it would have a better blended exhaust flow and remove a 180* bend. Fabbibg the downpipe would give a chance to tune the exhaust a bit as well. Just need a mani and downpipe flange.
Wish I could find an old car like that. Buddy has a Mango I've been trying to talk him out of.


I friend (whom passed away about 4 years ago) had a Datsun 1200 coupe with a 4AGE and a "proper" header... he had to have it built... and then some of the primaries were longer then others.... All the existing exhaust manifolds just don't fit.

4 chambers deshrouded

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



4 intakes....

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


and 4 exhausts....

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



Its off to the machine shop for a fresh 3 angle, back cut the intake valves, and machine the surface .010"



more to come....... Big Grin

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
11-26-2019, 06:55 PM
Post: #17
OST-062: Mixed Breed Autocross Whip
from another forum Wrote:OST just out of curiosity how far can you deck a 4age block?

To be honest... I have no idea... I'm sure you can take as much as .020", maybe more. How thick is the thickest gasket??? Cometic has a .120" thick gasket.....?????


I've been told the block only needed .009" to get that area perfect again..... photo below shows corresponding bad area in head.

[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
01-01-2020, 12:30 AM
Post: #18
OST-062: Mixed Breed Autocross Whip
More to come.... soon.


I've finally gotten the major components back, the remanufactured short block with .003" piston down from the deck

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


as well as the head - ready for assembly

[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
01-02-2020, 06:31 PM
Post: #19
OST-062: Mixed Breed Autocross Whip
from another forum Wrote:The DNJ pistons have worked out well for people's builds?

This is the second engine I've built that utilizes those pistons. OST-032, Skippy... that engine was also built using the DNJ pistons, Skippy's engine is now being used in a FX16 built for rally use.

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

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


Possibly Related Threads...
Thread Author Replies Views Last Post
  OST-068: Smok'n oldeskewltoy 5 595 07-13-2020 09:47 PM
Last Post: oldeskewltoy
  OST-064: Breathing on a 3 rib oldeskewltoy 15 1,759 04-06-2020 05:37 PM
Last Post: oldeskewltoy
  OST-066: I get all wavy (4AC content) oldeskewltoy 10 1,269 04-03-2020 04:29 PM
Last Post: Power_uP
  OST-063: Busy Boy oldeskewltoy 4 883 12-24-2019 01:55 AM
Last Post: oldeskewltoy
  OST-058: "Q" oldeskewltoy 8 1,497 10-22-2019 06:47 PM
Last Post: oldeskewltoy

Forum Jump:


User(s) browsing this thread: 4 Guest(s)

Contact Us | AEU86 | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication