OST-050 - a VERY special build
08-15-2018, 04:50 PM
Post: #21
OST-050 - a VERY special build
(08-10-2018 10:45 AM)mad.matt Wrote:  That finish is cool! It's kind of like a Parkerized finish.


While doing the research on coating the block, I came upon this possibility AFTER I got the Eastwood kit. If there is a next time, I'll keep this (parkerizing) in mind.........


A bit further......

[Image: AEU86 AE86 - OST-050 - a VERY special build]



more to come.... Hurray!

Dan -

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

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08-24-2018, 05:25 PM (This post was last modified: 08-24-2018 05:57 PM by oldeskewltoy.)
Post: #22
OST-050 - a VERY special build
It has been a while... Had to finish up and ship the 1GG head out, but now work begins again on this head...


it was @ 1 down, 3 to go....

[Image: AEU86 AE86 - OST-050 - a VERY special build]

Now @ 3 down 1 to go Wink




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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09-19-2018, 05:30 PM
Post: #23
OST-050 - a VERY special build
I haven't forgotten about this build........

The head is now ported, and now has a fresh 3 angle - chamber volume are measured before machining.....

[Image: AEU86 AE86 - OST-050 - a VERY special build]


and the volumes are.....

[Image: AEU86 AE86 - OST-050 - a VERY special build]


So to get this chamber back down to about 36cc I'll have it machined .010". The block was decked .004", and I'm planning on using a .036" MLS gasket.



How much less distance (thousandths of an inch) will there be between the cams, and the crankshaft then there was originally?




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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09-19-2018, 06:26 PM
Post: #24
OST-050 - a VERY special build
Roughly 0.025" or 0.64mm
Not too bad if you ask me and well within the adjustment of the tension pulley

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09-19-2018, 08:45 PM
Post: #25
OST-050 - a VERY special build
(09-19-2018 06:26 PM)Bean Wrote:  Roughly 0.025" or 0.64mm
Not too bad if you ask me and well within the adjustment of the tension pulley

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What's a thousandth between friends.... Smile

my #s: .005" + .010", + .011"(gasket difference)


[Image: AEU86 AE86 - OST-050 - a VERY special build]

... and it appears to be a but under 2 degrees...



Is it retarded, or advanced??







More to come.... Hurray!

Dan -

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

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09-19-2018, 11:40 PM
Post: #26
OST-050 - a VERY special build
Retarded?!?

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09-21-2018, 08:11 AM
Post: #27
OST-050 - a VERY special build
Could also be advanced it depence on the installation or do I miss something?

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09-21-2018, 10:15 AM (This post was last modified: 09-21-2018 10:16 AM by Bean.)
Post: #28
OST-050 - a VERY special build
(09-21-2018 08:11 AM)d3nso Wrote:  Could also be advanced it depence on the installation or do I miss something?
The belt lenght between the markings for the crank pulley and the stock exhaust pulley is fixed. Reducing the distance by decking the block/shaving the head brings the pulleys closer together. To compensate the exhaust pulley will be pushed ever so slightly counter clockwise.
There for to correct this situation one would use an adjustable pulley.

Dan please correct me if I am wrong Smile

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10-03-2018, 07:16 PM (This post was last modified: 10-03-2018 07:21 PM by oldeskewltoy.)
Post: #29
OST-050 - a VERY special build
(09-21-2018 10:15 AM)Bean Wrote:  
(09-21-2018 08:11 AM)d3nso Wrote:  Could also be advanced it depence on the installation or do I miss something?
The belt lenght between the markings for the crank pulley and the stock exhaust pulley is fixed. Reducing the distance by decking the block/shaving the head brings the pulleys closer together. To compensate the exhaust pulley will be pushed ever so slightly counter clockwise.
There for to correct this situation one would use an adjustable pulley.

Dan please correct me if I am wrong Smile

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I've been waiting on more conversation (and to confirm for myself.... Confused Blush Wink )


most of the people I consulted didn't really know... they just knew to set up a timing wheel and let the mechanical condition of that particular engine determine how much timing to adjust... but many couldn't agree as to which way (advanced/retarded) it worked......

d3nso - is technically correct, you could move it a tiny amount the one way, or a much more significant amount the other.



now is it retarded, or advanced... photos frequently help me..... Dumb question

[Image: AEU86 AE86 - OST-050 - a VERY special build]

as Bean described... as in the view above, the pulleys (BOTH) move about 1.5-2.0 degrees counter-clockwise. Another thought though would be to keep the pulleys stationary, and move the crankshaft clockwise to take up the slack.....

[Image: AEU86 AE86 - OST-050 - a VERY special build]


moving the crank clockwise 1.5-2 degrees to take up the slack means we have retarded cam timing. To confirm, we go back to the cam pulley, and visually rotate to correct... we move the cam toward the "A" to correct for machining


A LOT more to come... pretty soon..... 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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10-03-2018, 07:22 PM
Post: #30
OST-050 - a VERY special build
I see my flaw I jumped right to thelast step to correct it.

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