Jump to content
SAU Community

Camshaft selection (RB25DE head/RB30 bottom)

InterC00l

By InterC00l,
in Engines & Forced Induction

 Share

Recommended Posts

InterC00l Rookie

InterC00l

Posted
Posted

Looking for cams for this engine setup. Preferably HKS's. Here in the US, it's impossible to find ANYTHING for the RB series. Are all RB series cams the same (critical dimensions, not lift/duration)? What I'm asking is, are cams for a RB20 head compatible with a 25 head? What about cams for a 26 head? Also, does the VCT affect anything as far as compatibility? I hope I'm not confusing you all too much, I'm new to the RB series. Also, if you could suggest shops that I could get these parts through, or even just part numbers to cams that will work (pref. HKS). Thanks

-InterC00l

Steve Grand Master

Steve

Posted
Posted

Hi, might be able to help with a couple of things,

HKS step one cams are compatible with NVCS, and will bolt straight up without any mods to the heads.

I am having fitted 256/8.8mm in and 264/9.0mm exh (both step one), which appears to be a good combo for the street and track, also will be fitting an adj exh cam gear to dial it in.

If you want to retain the NVCS, you cannot fit an adjustable cam gear to the inlet side.

HKS cams can be bought through www.greenline.jp at quite reasonable prices, but the us has HKS dealers, cant they order them in for you?

Sorry about part numbers, my cam boxes are in the workshop as my cams are being fitted and I am at home. I will try to remeber to get them next time I am down there.

RB26 cams are not compatible with NVCS also they are solid lifter, RB25 is hydraulic.

RB20 cams - I know nothing:).

Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi Intercool, Steve covered most of it. RB20's are the same as RB25's except they don't have VVT. So you can use GTR cams in RB20's. Keep the lift under 9 mm and you won't have any trouble with using solid cams with the hydraulic lifters.

Our preferred camshafts for RB25DET are Tomei Poncams, they work very well with the VVT. There are accurately timed so we have found no advantage from using an adjustable camshaft pulley on the exhaust camshaft.

Hope that helps

InterC00l Rookie

InterC00l

Posted
  • Author
Posted

What about a solid lifter conversion? I believe Tomei makes one. Also, is it just the R32 RB25DE head that does not have VCT, or do all naturally aspirated RB25 heads lack VCT. I would rather run without the VCT.

As far as getting these in the US, I have people that can, but finding documentation on such items is dificult.

-InterC00l

Steve Grand Master

Steve

Posted
Posted

RB25DE from R32 does not have NVCS, from R33 it does.

If you want solid lifters and no NVCS, why not just use an RB26 head on your 3L bottom end. Probably easier and cheaper, plus you get the nice 6 throttle body plenum.

RB cams/NVCS specs are here: http://www.tomei-p.co.jp/_2003web-catalogu...haft-specs.html

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Unpeeling the Orange

      By MBS206 · Posted

      I'm normally copping my own abuse from neglecting my daily drivers. "Those suspension bushes will last a bit more", "Don't worry about the oil leak, just keep topping it up". The project cars I'm always doing things slowly on them as I'm wanting them to be done better, and neater, and nicer. Luckily I don't have to deal with 18 year old Matt's "Learning to wire" stuff in the project cars. And there's only one piece of wiring I'm displeased about in the Landcruiser, and it's about to be cut out... However, the box loads of parts that have been going through this place lately for the Landcruiser... Brake pads Brake Rotors Full handbrake overhaul Wheel Bearings Seals Swivel hubs Steering Boxes Half the suspension joints Shocks Air bags (Ones to go in the rear springs for towing) Water pump Timing kit Lower timing case Harmonic Balancer Radiator Lots of other little seals and shits Gas struts for the bonnet New power window switches And god knows what else I've forgotten... Ha ha ha I have my fingers crossed the pinion seals don't start leaking on the diffs, that the transfer case doesn't leak, and the gearbox input shaft doesn't leak, nor the rear main seal. As they're about the only seals I haven't replaced in the driveline! I'm seriously eyeing off buying new caliper rebuild kits front and rear brake calipers... I'll probably recheck all the valve clearances soon too, and hopefully, it should be all good and sweet to haul some long distance trips again!
    • GTSBoy
      Unpeeling the Orange

      By GTSBoy · Posted

      Every time I pull my 3x gauges out of the console and see the crack-addict way that I did the wiring, and I just can't bring myself to tear it all apart and "make it nice", because it is currently working. In fact, the last time I was in there I probably made it worse.
    • Kinkstaah
      Unpeeling the Orange

      By Kinkstaah · Posted

      The best part is when you own the car long enough that you look back and find your OWN ham fisted amateur shit!
    • MBS206
      Unpeeling the Orange

      By MBS206 · Posted

      The annoying part about neglect, is when you start to replace one thing, and find ten more broken things. Ham fisted monkey repairs you normally only find out about when trying to do something unrelated! Ha ha   Neglect you can kind of anticipate the huge costs to fix it all. Ham fistedness is normally a shock the first time your work on a new old car, as everything "looked" good before.
    • MBS206
      What brakes on R34 GTT(Europe)

      By MBS206 · Posted

      For DBA, check out their guide table here. https://dba.com.au/wp-content/uploads/2023/01/Direct_Replacement-Guide-2021.2.pdf   Additionally they have some other guides and info on how to make sure you choose the right pad.
×
×
  • Create New...