Jump to content
SAU Community

Neo Rb25 Valve Springs

R34GTFOUR

By R34GTFOUR,
in Engines & Forced Induction

 Share

Recommended Posts

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted

Hey everyone, just wondering if anyone that is knowledgable with the neo series rb25's can shed some light on this for me.

Im going to use my rb25de neo head on a rb30 conversion. I was intially going to change to valve springs since i was going to use a set of tomie pon cams (Duration: IN,EX 260 Lift: IN,EX 9.15mm) and after hearing all the people having trouble with r33 na heads with valves floating because of soft springs i thought it was a good idea. Anyway. i've since been lead to believe that unlike the r33's, the neo head uses the same valve springs for both the na and turbo setup, with only the cams themselves being different, so im asking myself will springs be needed?? So how far have people taken the stock neo valve springs? The 9.15 lift of the cams shouldnt be a problem, and the rpm limit will be at no more than 8000rpm so again that should be ok, but if i was running near on 1.8bar of boost with 500+awhp will the springs be upto the task?

Even if i wanted to stick some new valve springs in, im finding it hard to find springs for the neo head. The neo head as many of you know uses solid lifters, so the only springs i came across that might work at the r33 tomie spings rated to 10.25 lift but designed for solid lifter use. So im wondering if the springs are different between solid and hydrolic lifters, im wondering if r33 valve springs designed for solid lifter work with my setup?

:D

Link to comment
https://www.sau.com.au/forums/topic/210532-neo-rb25-valve-springs/
Share on other sites
R34GTFOUR Mentor

R34GTFOUR

Posted
  • Author
Posted
Performance Springs makes springs and retainers for NEO engine - I have them in my engine.

For the small outlay compared to the money you will be spending on the rest of the motor to make 500awhp - it isnt even worth considering whether to buy them or not.

cheers for the reply

i did a search and you recommended that mob in a few posts haha, which is good but a few people also said somethings that made me abit weary, I've still got about 6months up my sleeve before i start the build so i have a bit of time to sort it out. How much did they slug you for a set of springs if you dont mind me asking? I've seen anywhere from 300-600 for a set (tomie)

as soon as i sell my spare car i'll be msg you for some spool rods and cp pistons for the NEO :thumbsup:

Spoolup Mentor

Spoolup

Posted
Posted (edited)

I cant remember the price too be honest - maybe 300 - 400 for springs with the retainers to suit.

Depending on the comp ratio you are after, I can supply CP's and rods to suit the NEO with 30 bottom end.

Is this engine going in a R34GTFour ?

cheers for the reply

i did a search and you recommended that mob in a few posts haha, which is good but a few people also said somethings that made me abit weary, I've still got about 6months up my sleeve before i start the build so i have a bit of time to sort it out. How much did they slug you for a set of springs if you dont mind me asking? I've seen anywhere from 300-600 for a set (tomie)

as soon as i sell my spare car i'll be msg you for some spool rods and cp pistons for the NEO :thumbsup:

Edited by Spoolup
R34GTFOUR Mentor

R34GTFOUR

Posted
  • Author
Posted
I cant remember the price too be honest - maybe 300 - 400 for springs with the retainers to suit.

Depending on the comp ratio you are after, I can supply CP's and rods to suit the NEO with 30 bottom end.

Is this engine going in a R34GTFour ?

yep the gtfour :), i have a big lest of parts that i have written down to get, everything SHOULD slot in nicely. I'm getting a proengines 4wd adaptor, gt35r, already got the 6boost manifold, ported greddy copy plenum etc etc, the list is a long one :)

i'll definately be getting your rods and the low compression 8.2 CP pistons so with the less cc head that should bring it up to 9ish depending on hg (im waiting for you to do yours first to make sure its a-ok hahaha)

the only thing im uncertain on is the springs, i might give that mob a call this week and see what they can do.

:(

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

    • Duncan
      After market rear camber arm adjustment

      By Duncan · Posted

      Then, shorten them by 1cm, drop the car back down and have a visual look (or even better, use a spirit level across the wheel to see if you have less camber than before. You still want something like 1.5 for road use. Alternatively, if you have adjustable rear ride height (I assume you do if you have extreme camber wear), raise the suspension back to standard height until you can get it all aligned properly. Finally, keep in mind that wear on the inside of the tyre can be for incorrect toe, not just camber
    • V35Newbie
      After market rear camber arm adjustment

      By V35Newbie · Posted

      I know I have to get a wheel alignment but until then I just need to bring the rear tyres in a bit they're wearing to the belt on the inside and brand new on the outside edge. I did shorten the arms a bit but got it wrong now after a few klms the Slip and VDC lights come on. I'd just like to get it to a point where I can drive for another week or two before getting an alignment. I've had to pay a lot of other stuff recently so doing it myself is my only option 
    • Duncan
      After market rear camber arm adjustment

      By Duncan · Posted

      You just need a wheel alignment after, so just set them to the same as current and drive to the shop. As there are 2 upper links it may also be worth adding adjustable upper front links at the same time; these reduce bump steer when you move the camber (note that setting those correctly takes a lot longer as you have to recheck the camber at each length of the toe arm, through a range of movement, so you could just ignore that unless the handling becomes unpredictable)
    • V35Newbie
      After market rear camber arm adjustment

      By V35Newbie · Posted

      I got adjustable after market rear camber arm to replace the stock one's because got sick of having to buy new rear tyres every few months. Can anyone please let me know what the best adjustment length would be. I don't have the old ones anymore to get measurements. I'm guessing the stock measurement minus a few mm would do it. Please any help on replacing them would be fantastic I've watched the YouTube clips but no-one talks about how long to set the camber arm to.
    • GTSBoy
      Unpeeling the Orange

      By GTSBoy · Posted

      Heh. I copied the link to the video direct, instead of the thread I mentioned. But the video is the main value content anyway. Otherwise, yes, in Europe, surely you'd be expected to buy local. Being whichever flavour of Michelin, Continental or Pirelli suits your usage model.
×
×
  • Create New...