(Catching up...) OST-082: Nope, never again... at least not without all the parts
06-28-2022, 09:17 PM
Post: #1
(Catching up...) OST-082: Nope, never again... at least not without all the parts
[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]


[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]

It's a Honda......... a K24RBB2 head to be exact - from the TSX-S.


The client came to me wanting some porting work, and rebuilding on what essentially was to remain a stock (stock cams retained, stock springs**) head.



If you look carefully at the 2 panel of the head you'll note you can see many of the rocker assemblies ziptied - see below for why.



[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]


Without saying... this was the most complicated head I'd have the pleasure of working on. Note that I haven't actually disassembled the actual valves yet.... Huh

Here is the VTEC rocker assembly... and why they need to be bound together

[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]
[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]


and how oil is routed to engage/disengage VTEC

[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]



Porting begins.... for the most part the shape, and casting are rather good, and yet, some improvement is found....

(apologies for slightly different perspective/depth to the 2 photos)
[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]


The exhaust side sees some improvement as well (far right chamber shows change)

[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]



along with re-assembly - here is the torque pattern

[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]



and a before and after view....

[Image: AEU86 AE86 - (Catching up...) OST-082: N... the parts]



So, why the title?? (Nope, never again... at least not without all the parts) I HATE the Honda parts systems. You must order a part to find out if they have it.... I'll let that sink in...

My client tells me he has a K24RBB2 head - all well and good. What he doesn't tell me is the year - as he got it at the junkyard. Look again at the last photo showing the assembled head - note the extra room around the base of all the valve springs.....

My client picked up a 1st gen(05-06) RBB2 head, it came with a smaller valve spring then the later RBB2 heads. When I ordered springs, I ordered the ones that were for the later head, the springs were too big - they wouldn't fit my retainer and seat. When I tried to exchange the springs - I was SOL as the earlier springs had zero inventory in the USA. So my client got hit with a 20% restocking charge, and I had to order his springs from Japan. Now for more fun.... Honda in Japan only had 15 springs on the shelf, and it would be 12 weeks before the 16th spring became available...... Banging head Banging head Banging head Banging head


His head was ready from a porting, and machine work POV in about 6 weeks, parts took nearly 18 weeks SadSadSadSad

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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