OST-070: 7AGE for an N2 Levin
08-16-2020, 01:51 PM
Post: #11
OST-070: 7AGE for an N2 Levin
I think that's a good question. There is an issue with the 4AGE in transverse configuration where you get an oil surge on long right turns. That's why there are baffles available to stop the oil from being pushed in the wrong direction causing oil starvation at the pickup.
Can the same thing happen on a longitudinal installed engines?

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-070: 7AGE for an N2 Levin]
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08-17-2020, 10:18 PM
Post: #12
OST-070: 7AGE for an N2 Levin
(08-15-2020 10:49 PM)Vaptor Wrote:  What is the advantage of the MRP's wet sump, compared to a normal AE86 sump?

3 distinct advantages: 1) Volume... the MRP pan holds 5 quarts, the largest stock pan holds 4, and some 4AG pans holds only 3.5. 2) built in windage tray as well as baffles/trap doors to keep oil around the pick up. 3) extra bungs built in.

The most important of these, without a doubt, is the extra quart of oil.




cleaned and prepped, and epoxied... note oil pan and oil pump have previously seen duty as painting fill ins

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


now the block waits 3 weeks for the coating to fully cure.

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]



also re-did the crank pulley

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


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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08-18-2020, 04:59 PM
Post: #13
OST-070: 7AGE for an N2 Levin
from another forum Wrote:Epoxy instead of paint?

Have you heard of ceramic coating a block, for shedding heat? I was talking to someone at a shop who has ceramic coated parts for me, was getting some ideas. I was thinking about ceramic coating the 4A block that I've been using as a guinea pig (smoothing out the inside casting, etc).

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]

same product that I used on OST-050. It is far thinner than paint, and yet once cured far more durable. The look also replicates the original block when new.

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]



I have heard of ceramic coatings on all kinds of engine parts. Typically the 4/7 A blocks don't usually have cooling issues. I have looked into other coatings as well, but this is the most cost effective for what I'm trying to deliver.


more to come... Big Grin

Dan -

You can |Sad .... OR you can ask for help!!!

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08-19-2020, 06:46 PM
Post: #14
OST-070: 7AGE for an N2 Levin
(08-13-2020 08:48 PM)oldeskewltoy Wrote:  
(08-11-2020 09:48 PM)Vaptor Wrote:  Looking forward to this build, please post as many details as possible, also about the block assembly, would be nice to have a good build tread about a 7AGE, as I am going to build one for my car Dodgy

Will you be using a 4AGE Oil pump?

yes... with a few minor modifications (more later)

and now its later....

The OEM oil pump will have a number of modifications to help this mild mannered beast stay lubricated. As I've done before, this pump got mildly ported, smoothing the transition at the entrance to the pump(3), tapering the exit from the pump body(2), and gently working the inner radius of the pumps exit(1).

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin](photo from OST-053)

I also installed the SQ pressure relief valve spring kit (Australia)

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


Along with all of those mods, this pump also need one or 2 more......

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]

The 7A block, being taller, has the oil galley slightly further out then the 4A. The 7A pump matches the outlet, but has a few "flaws", the pump gears are not as thick, (so they can't use Toda pump gears) and it fits the "wrong" lower timing cover.

The 4AG pump has a flaw as well....(when using with a 7A block), the outlet isn't in the correct location.


So beginning with a 4AG pump I added 2 more radii, one inner(on the block), and one outer( on the pump) to remedy that

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


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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08-19-2020, 08:54 PM (This post was last modified: 08-19-2020 09:47 PM by Vaptor.)
Post: #15
OST-070: 7AGE for an N2 Levin
Prepared my own Oil pump, with port matched it with the Block, and did Pos 2 and 3, also got the SQ Spring, but pos 1 I did not do.

As I understand it, you have rounded the inner rough edge, to get a smother rounding. Correct?

Restoring my AE86, all the way... Going JDM style Big Grin
http://www.aeu86.org/viewtopic/ae86/p/150463#150463
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08-22-2020, 07:58 PM (This post was last modified: 08-22-2020 07:58 PM by oldeskewltoy.)
Post: #16
OST-070: 7AGE for an N2 Levin
(08-19-2020 08:54 PM)Vaptor Wrote:  Prepared my own Oil pump, with port matched it with the Block, and did Pos 2 and 3, also got the SQ Spring, but pos 1 I did not do.

As I understand it, you have rounded the inner rough edge, to get a smother rounding. Correct?

removing machining marks, and providing a "softer" radius at the entrance.



The head gets a deburr....

intake side...

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]



and the exhaust side

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


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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08-23-2020, 08:44 PM
Post: #17
OST-070: 7AGE for an N2 Levin
Oh... and of course... big valves need big seats

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


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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08-27-2020, 06:31 PM
Post: #18
OST-070: 7AGE for an N2 Levin
So... after about 6 hours working #1 - all on the intake side.... I decided to do a casting for comparison

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


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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08-29-2020, 07:14 PM
Post: #19
OST-070: 7AGE for an N2 Levin
... and an exhaust port capable of much greater flow........

[Image: AEU86 AE86 - OST-070: 7AGE for an N2 Levin]


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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08-29-2020, 09:26 PM (This post was last modified: 08-29-2020 09:28 PM by Vaptor.)
Post: #20
OST-070: 7AGE for an N2 Levin
The Exhaust gasket you are using here, what specific model is it, and from what company?

Restoring my AE86, all the way... Going JDM style Big Grin
http://www.aeu86.org/viewtopic/ae86/p/150463#150463
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