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R32 Rb25de Valve Spring upgrade

Prof_Finesser

By Prof_Finesser,
in Engines & Forced Induction

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Prof_Finesser

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Hello I had pulled the head off the rb25de from an r32 to check if oil was getting to the head and my buddy told me that these heads tend to float valves around 400whp so I decided that since the head was off again to get upgraded valve springs.  I've read on another post that it would take rb20 valve springs but can anyone confirm?  I'm going to be going with the super tech valve spring kit with retainers.  They have a kit for rb20 and 25.  

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https://www.sau.com.au/forums/topic/484328-r32-rb25de-valve-spring-upgrade/
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Prof_Finesser Enthusiast

Prof_Finesser

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39 minutes ago, GTSBoy said:

image.thumb.png.d6ecf052a37fd3aa05f431d19682b624.png

On the Kelford and other spring website it says rb25(with NVCS)  and they specifically have springs for rb20/rb25de(nonVCT) I went with the super tech valve spring kit for rb20.  I believe the ones on supertech are for rb25de are for r33 rb25s with vct

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Prof_Finesser

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On 8/29/2007 at 12:07 AM, Cubes said:

Ahh I was under the impression you went with the R32 RB25DE head. :D

Yes the R33's run 2 different length springs; they are a tad more than the r32 springs from Performance springs in QLD.

The factory springs may very well do the job with the r33's. The problem witht he R32's is that the springs they use in the R32 Rb25DE head are the same as they are in the RB20DET head. While they are fine controlling a smaller valve with the rb20; once you shove more weight behind from the rb25's head them they struggle. :S

Let us know the seat pressure just for my own curiosity. If need be shim them up a touch to get around 50-55 pounds.

this is what I also found earlier in the day

Prof_Finesser Enthusiast

Prof_Finesser

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14 hours ago, GTSBoy said:

Hmm. I guess this makes the thread good reference material for the possibly two or three people in the future who will try something similar with an R32 25 head.

yea I know most people don't really build these so.

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4 hours ago, GTSBoy said:

There never was that many of them in the first place, and it was all such a long time ago. Like hen's teeth. Most people, including myself, apparently, barely even remember that the R32 RB25 was closer to the RB20 than the R33 engines.

This was my first skyline I used to have a e36 m3 and getting this engine I did have to do some research about a couple things but not too much.  

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