OST-035: Silver Blaze
10-14-2015, 10:22 PM
Post: #11
OST-035: Silver Blaze
working the final port/bowl of this head...

[Image: AEU86 AE86 - OST-035: Silver Blaze]



[Image: AEU86 AE86 - OST-035: Silver Blaze]


and now with the head ready to go back and get it's exhaust only 3 angle, and a minimum re-surfacing - .001"


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
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10-21-2015, 08:41 PM
Post: #12
OST-035: Silver Blaze
Back from the machine shop... surface was machined .002", isn't that pretty, and ready to accept a metal gasket.

[Image: AEU86 AE86 - OST-035: Silver Blaze]


Now carrying the exhaust 3 angle(bowl closest), and as you can see the intake 3 angle is still good, so I used a tiny bit of lapping paste to get the intake seats and valves mated

[Image: AEU86 AE86 - OST-035: Silver Blaze]

Clover lapping paste on left, Permetex/NAPA valve grinding compound on right... think of the Clover as a polish

[Image: AEU86 AE86 - OST-035: Silver Blaze]


that polish helped reveal..... a tiny bit more performance may be available with a back cut on the intakes. That is for another day/head.

[Image: AEU86 AE86 - OST-035: Silver Blaze]

the red arrow is pointing to the top of the seat-valve contact point, so the dotted green lines represents a bit of room for a simple, clean back cut.



Finally, my client asked me if I could do something to better accommodate his use of ARP studs....

[Image: AEU86 AE86 - OST-035: Silver Blaze]

Look back at the first pic in this post to see the bolt hole before.....


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
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10-21-2015, 10:02 PM
Post: #13
OST-035: Silver Blaze
from another forum Wrote:I enjoy reading the detail in your threads but not being an engine builder guy I probably understand less than half of what you're saying...:confused:

What is the purpose/benefit of the multiple angles on the valve seats? Radiusing the openings for better flow?

Does the type of spark plug used during chamber volume measurement vary the reading? Or is something else used to plug the hole during measurement?

I use an epoxy filled spark plug with the ground electrode removed. This gives me a consistent measure. Yes - a "colder" plug will often times have a bit more room around the positive electrode, effectively increasing the chambers volume.

multiple angle valve seats - Air flowing past with minimal eddy currents. A steep angle on any of these faces and tiny eddy currents can cause poorer flow.

I've recently heard about a 7 angle... yes 7 angle valve seats... can't find a pic, but here is a 5 angle.... http://www.d-series.org/forums/attachmen...5angle.jpg

now if your machinist has the capability, this is what is often the top of the line for flow past the valve, it is a radius valve job - http://rennlist.com/forums/attachments/9...t-pic3.jpg the only flat surface on there is the small area where the valve contacts the seat, the rest is a radius

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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10-24-2015, 02:11 AM
Post: #14
OST-035: Silver Blaze
oldeskewltoy Wrote:another new tool on the way..........

[Image: AEU86 AE86 - OST-035: Silver Blaze]

I realized that I needed a new support system to assemble this head...

and so now that the port work, the valve job and the machine work are complete, assembly follows.......

[Image: AEU86 AE86 - OST-035: Silver Blaze]

the nut driver under the head was my seal installation driver today Wink


The 2nd new tool can be seen supporting the head.

so here is the 1st new tool (9/30/2015 post) up close, in "action"

[Image: AEU86 AE86 - OST-035: Silver Blaze]



and fitting the last valve....

[Image: AEU86 AE86 - OST-035: Silver Blaze]



assembled.... waiting for its owner.

[Image: AEU86 AE86 - OST-035: Silver Blaze]

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
10-24-2015, 09:08 AM (This post was last modified: 10-24-2015 09:09 AM by Bean.)
Post: #15
OST-035: Silver Blaze
We'll done, one happy person more Hurray!

AE86 ex-daily
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