OST-013: Massaging a virgin ;)
08-18-2011, 02:35 AM
Post: #1
OST-013: Massaging a virgin ;)
What have we here.... :cool:

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]



Let me introduce to you a virgin :eek:

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]


It is a brand new bare head - no valves, no seals, no wear! Work will begin on Monday Big Grin


This head is one of those being sold here: http://forums.club4ag.com/zerothread?id=93590

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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08-18-2011, 07:35 AM
Post: #2
OST-013: Massaging a virgin ;)
Thumbs up! lucky number 13 for me - looking forward to the progress Smile

general information - two weeks ago pismir had still one left, in case anyone is interested.

AE86 ex-daily
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08-18-2011, 10:26 PM
Post: #3
OST-013: Massaging a virgin ;)
Holy crap! Huh Thumbs up!

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-013: Massaging a virgin ;)]
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08-18-2011, 11:27 PM
Post: #4
OST-013: Massaging a virgin ;)
banpei Wrote:Holy crap! Huh Thumbs up!
you can say that again as I have another one of these being fitted with OS valves and worked by Loynings Huh

AE86 ex-daily
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08-20-2011, 02:55 AM
Post: #5
OST-013: Massaging a virgin ;)
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

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
08-20-2011, 07:16 PM
Post: #6
OST-013: Massaging a virgin ;)
Well.... here are some before photos......

intake ports... note @ the top of each photo the mismatched seat. Also note the casting flash

intake #1
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

intake #2
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

intake #3
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

intake #4
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]


The exhaust ports are always rough, note how the port walls are "crowding" the flow.

exhaust #1
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

exhaust #2
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

exhaust #3
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

exhaust #4 - note the mismatch size(one side is taller then the other) of the bowl from the right to the left in this port.... compare it to exhaust #3 and it is more evident
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]


Finally, chamber views. Note in these photos: 1) rough chamber edges(gasket mounting area) where the surface was machined. 2) the mismatched seats. 3) casting flash/flaws

chamber #1 - both views
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

chamber #2 - both views
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

chamber #3 - both views
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

chamber #4 - both views
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

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
08-21-2011, 12:01 AM
Post: #7
OST-013: Massaging a virgin ;)
the proverbial other forum Wrote:Are you going to cc the virgin chambers?

GREAT question....... and YES - that way I'll know definatively how large a truly stock combustion chamber is

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
08-23-2011, 01:37 AM
Post: #8
OST-013: Massaging a virgin ;)
Work begins by checking the combustion chamber volumes. To do this I use a burette

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

Chamber #4 measures out to 36.5cc.

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

The other chambers measure out to; #3 = 36cc, #2 = 36.25cc, and #1 = 36.25cc

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]


As I deshroud the chamber, I'll also be equalizing their volume. Here is a photo show chamber #4 deshrouded, #3 chamber in the photo is not yet deshrouded. The chamber walls have been highly polished

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

Bowl work begins, bowl #8 on the intake side is roughed to size. The factory production process is not perfect, so work is done to blend the bowls, valve seats and the chamber walls to allow maximum flow

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]


Working a bowl the key area is always the roof, here the bowl roof has been cleaned up, the guide narrowed some, and the guide boss has been narrowed substantially

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]


Finally for this post, a before and after on bowl #8

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

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
08-23-2011, 01:51 AM
Post: #9
OST-013: Massaging a virgin ;)
So now everyone can know that the stock chamber is between 36cc and 36.5cc, pretty cool to get proper CR Cool
Will you measure chambers after deshrouding ?

Also, can you show us the tool you use for the guide boss ?!
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08-23-2011, 02:22 AM
Post: #10
OST-013: Massaging a virgin ;)
Project D Wrote:So now everyone can know that the stock chamber is between 36cc and 36.5cc, pretty cool to get proper CR Cool
Will you measure chambers after deshrouding ?

Also, can you show us the tool you use for the guide boss ?!

I told my client that I would make sure all the chambers were balanced, so yes... I will have #s after deshrouding

I use a Dremel for all of the porting I do. The guide bosses were reduced using a round cutting bit

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

I then cleaned up after the round cutter with a few different round tipped abrasive bits

[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]

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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