OST-054: 3 rib with snap
02-06-2019, 05:35 PM
Post: #11
OST-054: 3 rib with snap
Chambers down to 35cc, ready for re-assembly. Cams are Cat cams 252/222 8.5mm lift.

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


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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02-10-2019, 10:31 PM
Post: #12
OST-054: 3 rib with snap
14 of the 16 valves came in too tight for my shim bank (.001" variance from .110"-.125"), so I brought them back to the machine shop to get tipped (shortened) so they would be in my shim banks shim range.

[Image: AEU86 AE86 - OST-054: 3 rib with snap]

As you can see the valves got tipped by different amounts, from as little as .003", to a "big" .012".


Final assembly will have all the intake valves with a clearance of .008"(0.203mm), and all the exhausts clearances at .009"(0.228mm).

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
02-13-2019, 06:07 PM
Post: #13
OST-054: 3 rib with snap
from another forum Wrote:As many heads that you rebuild, take 25 minutes and make a holding fixture from small section of angle iron, that will bolt on to your bench grinder. As long as you set the valve stem square to a fine grit wheel, you can easily remove a couple thou by hand at a time. Just have a container of water handy for cooling the valve stem be measurement checks. Sure is better, then waiting on a machine shop, so you can finish the head assembly. davew


If tipping was the only thing I needed, something along those lines would work... but I've been thinking it might be time for my next equipment upgrade. My last significant change was switching from Dremels (yes plural - I used up about 6) to the Foredom 1/6hp SP hanging motor, and hand tools.

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


I been thinking it might be time for my own valve grinding machine.

[Image: AEU86 AE86 - OST-054: 3 rib with snap]


This would allow me to do some experiments on valve back cut angles, along with precisely tipping the valves. Now, a new kwik way will run me about $7000. I might find a good used one for about $4000-$5000. The keys are the stones, and the chuck - the chuck needs to be accurate to .0005" Huh

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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