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Drilling Into Rb25 Head While Head Is On 25/30. Ideas.


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  • Gender:Male
  • Car(s):r33
  • Real Name:dan day
Hey guys,

Just thought I would throw this up for discussion.
Looking at drilling and tapping a hole for a remote oil feed for the vct on a 25/30 as it currently does not have one (internal vct mod doesn't work)

The head is currently on the engine and in car and was thinking of doing it in car.

The best strategy that i have come up with so far is:

drilling into head. grease covered drills and taps to catch the majority of the alloy and using compressed air from the other side of the drill location.

Not a real ethic way of doing things, but I am entirely open to ideas

Posted 11 February 2012 - 07:27 PM


  • Gender:Male
  • Location:Mackay
  • Real Name:Jono
My internal mod worked fine?

Posted 11 February 2012 - 07:31 PM

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R34 GTR V-Spec II - Almost stock. Powerfc, Standard turbos at 18psi, Tien Monoflex EDFC Suspension, Exhaust

R33 GTS-T - Stock RB25DET - 314rwkw, 720nm@3200rpm - Crashed because some loser didn't give way... 
My 300rwkw Adventures - http://www.skylinesa...rwkw-adventures
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  • Gender:Male
  • Car(s):r33
  • Real Name:dan day

My internal mod worked fine?


ive got 1.5 restrictors, working cam gear and working switch. just doesn't work xd
yours is the only one I have heard off that has worked

Posted 11 February 2012 - 08:16 PM


  • Gender:Male
  • Location:Mackay
  • Real Name:Jono
And my restrictors are only 1.3mm

Sorry to hear its not working.

Posted 11 February 2012 - 08:21 PM

f57d3186-a698-4ccc-a4fd-6a5e8fe165d1.jpgsausig.jpg
R34 GTR V-Spec II - Almost stock. Powerfc, Standard turbos at 18psi, Tien Monoflex EDFC Suspension, Exhaust

R33 GTS-T - Stock RB25DET - 314rwkw, 720nm@3200rpm - Crashed because some loser didn't give way... 
My 300rwkw Adventures - http://www.skylinesa...rwkw-adventures
My Water Methanol Injection Adventures - http://www.skylinesa...tallation-pics/


  • Gender:Male
  • Car(s):r33
  • Real Name:dan day

And my restrictors are only 1.3mm

Sorry to hear its not working.


All gud, need some brain storming on this for ideas

Posted 11 February 2012 - 08:23 PM


  • Gender:Male
  • Location:Balga, Perth
  • Car(s):HR31 coupe
  • Real Name:Jonathon
how exactly did you do the internal mod? what size holes did you drill and exactly where did you drill them etc, how have you tested the solenoid? unless theres somehow not enough pressure it should work fine.

Posted 11 February 2012 - 08:33 PM


  • Gender:Male
  • Car(s):r33
  • Real Name:dan day

how exactly did you do the internal mod? what size holes did you drill and exactly where did you drill them etc, how have you tested the solenoid? unless theres somehow not enough pressure it should work fine.

1.5mm(from memory) drill bit through the sealing wall of the brass bung.
Using a working solenoid and I can turn it on off via vipec.

I am 100 % sure its because of the lack of oil pressure due to recieving it from the lifter gallery

Posted 11 February 2012 - 09:00 PM


  • Gender:Male
  • Location:Auckland New Zealand
  • Car(s):S1 WGNC34 Stagea RB30/25
  • Real Name:Bob
I think you will have to remove the head (or maybe the whole engine) as you only need a tiny bit of swarf to block your oilways - or you could get fine particles circulating in your oil supply.

Posted 11 February 2012 - 09:41 PM


Stagea 1996 S1 RS4T :RB30/25  76mm turbo back exhaust -http://www.sincocustoms.co.nz/ high rise manifold, Garrett GT3540R, Synapse 50mm w/g, Walbro GSS 341 lift pump, Bosch 044 from surge tank, 550 DeatschWerks injectors, Hybrid fmic, Greddy copy FF plenum, Tomei sump baffle kit, Link G4 ecu.



Oil restrictors and crank collars for sale: http://www.skylinesa...-crank-collars/

 


  • Gender:Male
  • Car(s):r33
  • Real Name:dan day

I think you will have to remove the head (or maybe the whole engine) as you only need a tiny bit of swarf to block your oilways - or you could get fine particles circulating in your oil supply.

That is not an option. someone who has seen the insides of the of a 25 head does the oil return from the vct (when vct off) go directly to vct drain on side of head (2 bolt flange with metal return to sump)
not via anywhere else?

Posted 12 February 2012 - 07:56 AM


  • Gender:Male
  • Location:Wollongong, NSW
  • Interests:Cars, Cruising, Friends (Not necessarily in that order)
  • Car(s):ECR33, VTSS S2, FG XR6T
  • Real Name:Matt
That drain isn't just for VCT, it is just a straight out drain.

Don't drill the head on the block. You're risking some MAJOR damage...

Posted 12 February 2012 - 05:24 PM

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  • Gender:Male
  • Car(s):r33
  • Real Name:dan day

how exactly did you do the internal mod? what size holes did you drill and exactly where did you drill them etc, how have you tested the solenoid? unless theres somehow not enough pressure it should work fine.


have you done this/seen it work?

Posted 12 February 2012 - 10:00 PM


  • Gender:Male
  • Location:Balga, Perth
  • Car(s):HR31 coupe
  • Real Name:Jonathon
yer as far as i know myne works fine, havent actually run it on the dyno with it plugged and unplugged but i havent noticed a lack of midrange at all.

from memory i drilled a 1.5mm hole through the plug then another 1.5mm through the top. and block feeds are 2 x 1.6mm with a standard 25 pump

Posted 12 February 2012 - 10:13 PM


  • Gender:Male
  • Car(s):r33
  • Real Name:dan day

yer as far as i know myne works fine, havent actually run it on the dyno with it plugged and unplugged but i havent noticed a lack of midrange at all.

from memory i drilled a 1.5mm hole through the plug then another 1.5mm through the top. and block feeds are 2 x 1.6mm with a standard 25 pump


i don;t think anyone with a 30 bottom end notices a lack of midrange lol.
I've got a very similar setup. 1.5mm hole through brass bung. block feeds 2 X 1.5mm stock oil pump

Posted 12 February 2012 - 10:21 PM


  • Gender:Male
  • Location:Brisbane
  • Interests:Habitual modifier...
  • Car(s):R33 GTST, Chevy ASCAR Race
  • Real Name:Michael
Definitely a head off job if you want to do it properly, otherwise you will get swarf in your oil system, that much is certain.

Posted 13 February 2012 - 06:23 AM


  • Gender:Male
  • Car(s):r33
  • Real Name:dan day
been trying to do alot of out of the box thinking to no avail. lol
ive spent a little bit of time to test and compare between my rb25/30 and 3 rb25's.

the 25/30 with internal vct mod does not pour as much oil out as the standard 25 setup (ive got 3 rb25's and they all push out more oil out of the vct solenoid plug when solenoid is removed

has anyone had a play with their inlet cam cam gear, is it possible to move the adjuster (for the cam advance) by hand?

i tried moving a spare cam gear that I had lying around and It was near impossible to budge it. this cam gear could be stuffed just a bit curious.


contemplating swapping over inlet cam gear over for a known working unit atm

Posted 15 February 2012 - 09:16 PM





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