Jump to content
SAU Community

Recommended Posts

RB26 Head questions

Hey guys, I have tried to do some research and I can not seem to find the right threads to answer my questions. I'm currently doing a rebuild on my RB26 head and have a few questions.

My current parts list I have is

Brian Crower single spring & titanium retainers,

Supertech valve guides,

Brian Crower +1MM Intake & +1MM Exhaust valves,

Kelford 280 10.5mm lift cams

And what I can not find is if it's acceptable to reuse the OEM Valve Keepers/Locks and what the OEM Camshaft Studs are rated to. Are these MUST have things when doing the head?

Link to comment
https://www.sau.com.au/forums/topic/468066-rb26-head-questions/
Share on other sites

What collets does BC specify/recommend for their valves?  Are OEM compatible?  Check with your supplier.

Camshaft caps are held by bolts.  Any reason they won't work properly?  Are there even studs available?  The items being held only have rotary motion.  Not reciprocating, and there isn't the pressure of combustion trying to dislodge things.

If you establish a plan with your chosen engine builder things can potentially run smoothly as the parts are matched and fit for purpose.  There's been some very good discussion regarding RB26 cams/heads and what can be achieved with surprisingly mild cams combined with the right turbocharger system spec.

I see Tomei does list studs.  The blurb generally indicates they are for fairly extreme lift and rpm eg 12mm lift, 10000rpm.

No real indication of what service this head is being put to.

I stand by comments regarding a discussion with the person chosen to build the thing.  Come up with a total combination fit for purpose.  "Maybe" these things are a useful/necessary item in OP's case.  Doubtful IMO though at a few hundred $$ not much in the overall scheme of a build.

Any particular reason why your going BC valves springs and retainers? For a fraction more you can get a full supertech valvetrain package and dual springs.

 

Also, whats the intended use for the car as those cams are not ideal for a street car

Any particular reason why your going BC valves springs and retainers? For a fraction more you can get a full supertech valvetrain package and dual springs.
 
Also, whats the intended use for the car as those cams are not ideal for a street car


There's a few machine shops in Canada that have had good luck with Brian Crower springs/ retainers plus there spring specs like coil bind/seat height/spring pressure were closer matched to the Kelford springs that they recommend for there cams. And the stiffest single spring supertech offers is 60lbs which might be to soft. And trying to avoid dual springs and you need to bed the cams in with only 1 spring then add the 2nd spring later.

Cam choice is based off my turbo size and 900whp goal. Its a weekend street/drag car.

Just do the cam cap studs. I did, I just felt it was a bit of insurance and a small cost given what the rest of the engine was worth

Crower are very quick to respond to emails so shoot them off an email about the other stuff. I am sure they will answer in no time at all and give you an answer that will be 100% reliable ;)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • GTSBoy on your suggestion on another thread I had a look at those injectors and ended up getting them because of the quality.  Got the expensive ones.  
    • Hey guys been looking everywhere to try and find the correct gtr hood latch support part number but only found the first half and when I search with that number it sends me to an r34. The first part I found was 62515. If anyone could help me with the rest then I’d really appreciate it. Or if there’s some alternative hood latch support that would work even better cause I can’t find any for sale. (Searched on upgarage, partsouq,buyee,rhdjapan) 
    • If you've only done the upper control arms on the rear, AND you have changed their length (by more than about 1mm) to set the camber you want, then you will definitely need/want to install traction arms also. Adjusting the camber arms on their own WILL introduce bump steer and make the car unpleasant to drive. Most owners have no idea that their car could behave infinitely better than what they put up with. I'm not entirely sure what the Stageas need, but I am thinking that unless you have massive front spring rates and pretty soft rear springs, you have waaaay too much rear bar. Oversteer city, in my estimation. Combined with possible excessive bump steer from maladjusted arms, that could be a recipe for nastiness. ATR43SS2 is not a highflow. It is an outright replacement turbo. It's a little bit bigger than the largest highflow profile that Tao does. Probably a solid 300rwkW turbo where the bigger highflows will be about 30-40rwkW less. Nevertheless, we're only talking about ~300 rwkW, which is well within the abilities of the stock ECu to run with a Nistune on board. I would do so without hesitation - and I will be doing so when I get my finger out and actually get the injectors and AFM installed. But, if you would prefer to drop a whole lot more money on the ECU side, then I suspect you're looking at Haltech. The Haltech fanbois here will all spout on about all the available engine protection you can have, that you can't have with the Nistune option. And they're right. But it doesn't really come for free either. You will spend more money on extra sensors and the like, plus the work to install them. If the engine was built and therefore represented a big investment to protect, then I'd say definitely do it. If you view the current (and forever into the future) shortage of replacement engines as something to prompt similar protection, then also, do it. If you see a destroyed RB25 as an opportunity to put in a Mercedes or other V12 (like I kinda do)... then your perception of the risk/reward might differ. These are good injectors. You can also get a "better" set of the same with more flow matching, for more $$. 1000cc is where you will want to be. You will need an R35 AFM and adapter tube if you want to stay with Nistuned stock ECU. Otherwise, if going Haltech, you can ignore. As for intercooler. Just about anything will do. You're only talking about ~300rwkW. Just put a big core in there. Be aware that return flows do add significant pressure drop and will cost power and will make the turbo work harder to achieve the same goals. If you can manage a proper crossflow, do it. I'm keeping my very good return flow because I'm only expecting to be in the ~250rwkW range, and will live with whatever outcome I get.
    • I have a heap that i have collected if you want some authentic ones still. Pm me if your interested!
×
×
  • Create New...