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Rb25/30 Rb30det Vvt Internal Oil Control

psi

By psi,
in Engines & Forced Induction

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psi Experienced

psi

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Posted

Ok, I am wanted to run my RB30Det to look stock.

So, after I got an idea from someone on here, this is what I've started!

The first photo is of the welded oil gallery that feeds oil from the RB25 Block and supplies oil to the VVT.

The RB30 block only has a water jacket there and most people weld this hole anyway.

You could add a grub screw instead of welding, but I know that the weld is there for good and it is metal a very long way down the gallery!

The second photo is of the plug that is coming out (orange bit) to allow me access to the oil rail that feeds oil to the cam buckets..

I will be making a 'plug' that will fit in here next week (I hope!) and I will show a step by step account of how I did it all..

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fletch rb30
fletch rb30

33 and 34 vct activation is different. On 33 heads, the oil constantly feeds the front journal to lubricate it. The oil leaves the journal via the vct solenoid into the head. When the vct engages the

daisu
daisu

Just to get an idea of how it works, is this what is happening with the oil feed?

psi
psi

I've heard of a few plugs that refuse to play the game. I thought I would have that issue and got some brass just incase.. If you do break or mangle it, you will have to make a copy. Nice pics

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psi Experienced

psi

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While the head is apart, I got the die grinder up into the oil return ports.. the foto isn't real clear, but have a look in yours and you will see what I am on about, It looks like a monkey made the holes!

post-34369-1231401640_thumb.jpg

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted

this will be interesting, i've been look at the rb25 head and thought that if the timingbelt/gear wasnt in the way it would be a great place to supply oil to the vct, what sort of clearance are you going to have between the plug and cam gear?

psi Experienced

psi

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I am getting oil from inside the head. No external oil lines. Nobody will ever know its there!

The coloured plug is coming out and I am going to machine a new plug out of brass to go back in there.

The new plug will get oil from the oil rail that supplies oil to the cam buckets.

The new plug with have a hole in it and the VVT will work as per normal.

No where for oil to leek, keeps things neat and tidy because there is nothing to look at!

The new plug will be hidden behind the cam gear,

you would only ever see the plug if you took the cam gear off and actually see the end of the little brass plug..

fletch rb30 Enthusiast

fletch rb30

Posted
Posted

The plug you want to pull out is pretty long, its a bit tricky to get out but can be done easily once you have done it once. You need to drill right through it with a 2mm then 5mm and tap to 6mm to get a bolt ina nd pull it out.

psi Experienced

psi

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The darker plug is the original unit. I could have used the original plug but I had tapped just a little too far into it when I removed it. The thick end of the plug is 12mm long. So, If you dont want to make a new plug, dont tap that far down.

I then drilled a 2mm hole down the cam buckets end (in the new plug) and then drilled a 1.5mm hole to allow oil into the passage where I wanted the oil! Jobs done, re-insert the plug and continue on your merry way!

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psi Experienced

psi

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Now for a few more pics..

the pink filled bit in the cam journal is where the oil is fed into the bearing (that now comes from my new mod), and the Green bit is where the oil is fed to the VVT..

The pink circle is where the new plug will be inserted.

The brass plug is the return oil passage from the VVT solenoid to the head.. not much exciting in there, but I just wanted to look in there!

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psi Experienced

psi

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ohh, I used a 3/16 bolt as a puller to pull the plug out. Its just a bolt I had in the tool box and I had a tap to cut the thread that matched. I spaced it out from the plug with a socket.. It wasn't overly hard to get out.

It was all a bit easy, and if I ever do it again, I reckon I could do the hole job in about half an hour! (now I know what I'm looking at!)

Cheers, I hope it helps a lot of others out!

fletch rb30 Enthusiast

fletch rb30

Posted
Posted
Now for a few more pics..

the pink filled bit in the cam journal is where the oil is fed into the bearing (that now comes from my new mod), and the Green bit is where the oil is fed to the VVT..

The pink circle is where the new plug will be inserted.

The brass plug is the return oil passage from the VVT solenoid to the head.. not much exciting in there, but I just wanted to look in there!

The green bit is the oil exit from the journal/vvt. If you look at the cam you will see a groove around it. the vvt solenoid blocks the return (green drain) and this pressurises the journal which pressurises the cam and pumps up the vvt mechanisim.

Nice job btw!

Have you welded up the oil feed in the head surface? you could insert a straight brass plug without machining the sides out of it and not need to weld up the oil feed in the bottom of the head surface.

psi Experienced

psi

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I was amazed at how quick it was to do.. If you dont drill and tap as far down the original plug like I did, you will be able to reuse the plug and drill the new oil holes like my new plug and re-insert it. It wont cost you a single dollar! All done (even if you stuff around) in well under an hour..

How great is that? No external oil lines or fittings or any possablity of anything leaking and having it all going wrong!

It keeps the VVT working as per normal, there is nothing on the outside of the engine to give the RB30det secret away (other than the height) and it will all look like it was made like that.

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted (edited)

where did you get the new plug from? nissan? EDIT: Just re-read it and you got one machined :angry:

So you drilled the 2mm whole in the bottom of the plug, but how far along did you drill the 1.5mm whole to feed the vct?

Well Done!

Edited by R34GTFOUR
psi Experienced

psi

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The thinner end of the plug faces the oil from the cam buckets oil gallery..

I drilled the 2mm hole in that end (as you will be able to see in the 1st foto). The hole is only long enough to clear the first part of the plug. In the second foto of the plugs, you will see the hole in the 'shaft' part of the plug. This is were the the oil will be feeding oil in from the cam bucket oil rail and into the port where we need the oil. The oil used to come in from the bottom (which I welded) up past the plug and then continue up into the cam bearing.. So, no the oil feeds in through the plug, & the rest of the oil system is untouched.. and I reduced the amount of oil going to the top end which everybody is also wanting to do..

Does that make sense?

Edit: If you want to do this mod, dont make my mistake and drill too far into the plug. Its only 12mm long in the thick end (this is the end that you will see) Only drill 8mm or so, tap it with a small tap (3/16 is what I did.. it works a treat, or something about that size) and then you can just reuse the same plug!

Edited by psi
  • 1 month later...
TriniGT Experienced

TriniGT

Posted
Posted

Damn!!!! Nice work, I am now embarking on this with a Neo R34 head on an RB26 block. Was wondering if you could just clip off the entire end of the plug and just let oil come in from the cam side totally and feed the VCT? Is that even an option rather than drilling the plug and then feeding it to the VCT setup? Any care to let me know what are the effects if this is done?

psi Experienced

psi

Posted
  • Author
Posted (edited)
Damn!!!! Nice work, I am now embarking on this with a Neo R34 head on an RB26 block. Was wondering if you could just clip off the entire end of the plug and just let oil come in from the cam side totally and feed the VCT? Is that even an option rather than drilling the plug and then feeding it to the VCT setup? Any care to let me know what are the effects if this is done?

Dont snip the end of the plug off! If you do that, you will end up with WAY too much oil in the port and also risk starving the cam buckets the oil they want!

I coppied (so to speak) the factory oil system, used same sized oil feed holes. This means that the solinoid works exactly as it did beofre on the RB25!

I left the photo's thumb nails on the forum, if you want them really large just click on the foto you want to look at and it will be page sized!

This helps with the people who are looking for the finer details..

Edited by psi

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