OST-075: Blue(top) Hawaii
05-04-2021, 05:36 PM
Post: #1
OST-075: Blue(top) Hawaii
[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


After discussing this build with my client, he sent me his largeport head, and his Crower cams.

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]



Unpacked...

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]



cam covers removed....

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]



and fully disassembled, prior to getting cleaned, pressure checked, and tumbled

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]



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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05-05-2021, 10:11 PM (This post was last modified: 05-05-2021 10:12 PM by oldeskewltoy.)
Post: #2
OST-075: Blue(top) Hawaii
A closer look at the valves......

Once you get past the really bad one... do you see it?

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


The TVIS effect.... Valves 1, 4,5, and 8, the valves w/o the TVIS butterflies have far more build up.



[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]

... and this head has been serviced at least once before... head machined...


... and valve job?? Sad

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


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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05-05-2021, 10:45 PM
Post: #3
OST-075: Blue(top) Hawaii
Are those valve seats machined crookedly?

FABRICA MI DIEM, PVNC!
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05-06-2021, 07:05 PM
Post: #4
OST-075: Blue(top) Hawaii
(05-05-2021 10:45 PM)Ivan141 Wrote:  Are those valve seats machined crookedly?

Why yes.... yes they are [Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]. And don't ask how they did it... cause I don't even know.....

This is just another reason to get the head properly rebuilt....


So, on to deburring the head, and I found this [Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


simply amazing......................


Now, this is the cam card that came with my client's cams.....

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


anyone tell me what seems to be wrong???



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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05-06-2021, 10:51 PM (This post was last modified: 05-07-2021 09:09 AM by Bean.)
Post: #5
OST-075: Blue(top) Hawaii
The nomenclature is very strange to begin with and the visual aid isn't helping at all with the intake going full circle.

The duration @0.05 lift and the opening closing degrees don't add up for me. The intake calcutes to 212 but the exhaust ends up at 228. If I interpret the minus sign for the exhaust wrong I can get it to 212 but then there wouldn't be any overlap (on the contrary all valves would be closed for 8°). Also the ramp seems to be very slow/wide but that might just be me as I'm comparing it to Catcams which are known for a rather aggressive ramp angle.

I haven't wrapped my brain around engine related things for years and it's very late so I might be completely off Big Grin

AE86 ex-daily
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05-10-2021, 06:26 PM (This post was last modified: 05-10-2021 06:31 PM by oldeskewltoy.)
Post: #6
OST-075: Blue(top) Hawaii
(05-06-2021 10:51 PM)Bean Wrote:  The nomenclature is very strange to begin with and the visual aid isn't helping at all with the intake going full circle.

The duration @0.05 lift and the opening closing degrees don't add up for me. The intake calcutes to 212 but the exhaust ends up at 228. If I interpret the minus sign for the exhaust wrong I can get it to 212 but then there wouldn't be any overlap (on the contrary all valves would be closed for 8°). Also the ramp seems to be very slow/wide but that might just be me as I'm comparing it to Catcams which are known for a rather aggressive ramp angle.

I haven't wrapped my brain around engine related things for years and it's very late so I might be completely off Big Grin

from another forum Wrote:I'll venture an uneducated guess. A negative number for the exhaust valve closure, i.e. -8.0 BTDC. Perhaps a negative "before" degree reading equals "after"?

PS: Are you keeping the fishing line weight or returning it to the client?

In this case it is 8 degrees BTDC, otherwise as Bean mentioned we would be @ 228 if it were after TDC. A few things to remember most of the mild cams will close the exhaust valve BTDC, or close to TDC, while still at a certain lift point (either .040"/1mm, or .050"), seat to seat the valve still usually closes after top dead center - dependent on cam timing.

agreed, their timing wheel/diagram doesn't help either......

As to comparing them to Cat cams - yes, the Crower are far more mild a ramp, and offer only a minimal lift increase (7.75mm lift) over stock cams. The Cat cams I typically recommend for mild builds are 212 @ .040" (likely around [email protected]"), but with 8mm lift. So the Cat cams are a tiny bit shorter in duration @, much shorter in duration overall, and offer more lift. The Crowers will twist a few hundred more rpm.


But while all that is pertinent, that wasn't what I was after.....


This is what I was focused on..... Crower had HOT clearances... something you just don't get, and the FSM only has a reference for.... AND the reference is looser then Crower's spec - possibly making clearances too tight on the Crower cams.... [Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]





more to come....... Hurray!

PS - didn't keep the weight.... Wink

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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05-11-2021, 10:13 AM
Post: #7
OST-075: Blue(top) Hawaii
I seen the clearance thing but disregarded the 'hot' part entirely as the seemed in the ballpark for 'cold' - maybe another typo?

Have you tried contacting Crower - as there's some blurb about changed specs and stuff?

AE86 ex-daily
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05-13-2021, 10:10 PM
Post: #8
OST-075: Blue(top) Hawaii
(05-11-2021 10:13 AM)Bean Wrote:  I seen the clearance thing but disregarded the 'hot' part entirely as the seemed in the ballpark for 'cold' - maybe another typo?

Have you tried contacting Crower - as there's some blurb about changed specs and stuff?

I called, and left a message, as well as emailing them. No answer.....

Then I got the brilliant idea of doing a search on their website.... bingo.

Some changes - clearances no longer specified hot, some absent info - TRD single springs are no longer available, so no spring listed. Timing wheel better... but still inaccurate, or at least it doesn't represent actual timing.

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]



now 2 down.....

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


from a slightly different perspective

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


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
Find all posts by this user
05-13-2021, 10:52 PM (This post was last modified: 05-13-2021 10:55 PM by Bean.)
Post: #9
OST-075: Blue(top) Hawaii
I know it's tedious but in my opinion you would be best off to measure it yourself - if they did change the specs at one point who knows what version you have in hand.

EDIT: as for the illustration it looks intended as an abstract and not to the actual degree as 8° ATDC isn't anywhere close to what is pictured in either of the two drawings

AE86 ex-daily
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05-22-2021, 01:36 AM
Post: #10
OST-075: Blue(top) Hawaii
(05-13-2021 10:52 PM)Bean Wrote:  I know it's tedious but in my opinion you would be best off to measure it yourself - if they did change the specs at one point who knows what version you have in hand.

EDIT: as for the illustration it looks intended as an abstract and not to the actual degree as 8° ATDC isn't anywhere close to what is pictured in either of the two drawings

Agreed, I set clearances to .006" on the intake side, and .008" on the exhaust side.

As far as cam timing, that is in my client's hands - I did send him both cam cards - so he should be able to set them up.


From 3 down to 4 down.......

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]



And off to the machine shop where that horrible valve job went away....

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


Once back in my hands, a quick re-assembly... and checking clearances....

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]


A big swing is needed... 10 of 16 valves I can't get a clearance on.... so back to the shop to get them tipped - If you look to the far left you can see how much I had the intake valves tipped....


Now with clearances set - a set of faux cams is fitted to keep the shims/buckets in place during return shipping.

[Image: AEU86 AE86 - OST-075: Blue(top) Hawaii]

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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