rb 30 & rb 26 oil restrictors

[exXU1]

RB 30 has 2 x 2mm in block, rb26 has 1 x 2mm at balancer end and a pin prick size one at crank end.

Have put 1.5 in at balancer end on rb30 ( going to have 26 head on her) what size would be best at other end---- Blank , 1mm 1.5 or put standard 2mm in?

For your oppinion.

[Sydneykid]

One oil feed is plenty.

[exXU1]

One oil feed is plenty.

Can always rely on you !

THankyou

[Fitzpatrick Speed Works]

Dave & Gary,

Dave after I taked to you about this i looked at my spare rb30 and noticed that you are right they are 2mm, however on my good engine the one I was basing my opinion on the oil feeds are only 1.2mm??? Gary have you ever seen the rb30 with the smaller oil feeds, I had a look at a few others today and they are all bigger (2mm), and I know I didnt change them so this is really weird!!!! Not complaining just trying to work out why so if it is a production thing I will look fo more motors or this model...

[Cubes]

My RB30's oil restrictors were exactly 2 x 1.8mm.

The RB20DET's were exactly 2 x 2.4mm.

I took a pic after an oil change today.. On idle it looks like there's plenty of oil on the cam lobe.

I poured the 4.5ltrs in to the motor as quickly as the 5ltr container would allow. It didn't over flow and drained in to the sump super quick.

Much quicker than the rb20det used to as the rb20det would to overflow if I poored oil in too quickly.

[exXU1]

Dave & Gary,

Dave after I taked to you about this i looked at my spare rb30 and noticed that you are right they are 2mm, however on my good engine the one I was basing my opinion on the oil feeds are only 1.2mm??? Gary have you ever seen the rb30 with the smaller oil feeds, I had a look at a few others today and they are all bigger (2mm), and I know I didnt change them so this is really weird!!!! Not complaining just trying to work out why so if it is a production thing I will look fo more motors or this model...

Daniel , yeh that does seem a little un unusual!

Please don't think i am doubting your observations , but it easy to over look these small but important things .

I am going 1.5 in each one.

[Fitzpatrick Speed Works]

Yeah I think that is the way to go Dave. You have to ask around on these things especially considering there seems to be variances in the blocks themselves!!

[OFENSV]

One oil feed is plenty.

what about with the rb25det head, is 1 enough? i have used the 2 standard rb30 ones and having the problem with the cam covers overflowing with oil at high rpm. did 1 run at the drag day yesterday and my catch can was full and over flowing

[exXU1]

One oil feed is plenty.

what about with the rb25det head, is 1 enough? i have used the 2 standard rb30 ones and having the problem with the cam covers overflowing with oil at high rpm. did 1 run at the drag day yesterday and my catch can was full and over flowing

<{POST_SNAPBACK}>

Gees that's no good!

You went one , but what size? 1.5 or larger.

[Sydneykid]

One oil feed is plenty.

what about with the rb25det head, is 1 enough? i have used the 2 standard rb30 ones and having the problem with the cam covers overflowing with oil at high rpm. did 1 run at the drag day yesterday and my catch can was full and over flowing

<{POST_SNAPBACK}>

The RB25DDET cylinder head has 3 oil feeds, one for the VVT and the 2 others as found on all RB's. For the R32 RB25DE cylinder head on the RB30 bottom end, I used one feed (the rear one) and blocked off the front one. In ~5 years it has never put any meaningfull oil in the cacth can and the cams are in perfect condition.

[exXU1]

what about with the rb25det head, is 1 enough? i have used the 2 standard rb30 ones and having the problem with the cam covers overflowing with oil at high rpm. did 1 run at the drag day yesterday and my catch can was full and over flowing

<{POST_SNAPBACK}>

The RB25DDET cylinder head has 3 oil feeds, one for the VVT and the 2 others as found on all RB's. For the R32 RB25DE cylinder head on the RB30 bottom end, I used one feed (the rear one) and blocked off the front one. In ~5 years it has never put any meaningfull oil in the cacth can and the cams are in perfect condition.

<{POST_SNAPBACK}>

So your recommendations for the RB 26 head on a rb 30 bottom end , with a 1.5 oil restricor on the front is what with the second one towards the fly wheel ?

[williamsf1]

slightly off topic, but I'm curious to know if there is some way of restricting the flow of oil to the head and consequently out of the engine down to the catch can! as the track has shown the G loading slide it out just nicely!!!

I was thinking to place some type of element (foam?) in the pipe to the can to stop the majority of this....

I don't want to have to take the head off

cheers....

oh and RB26DETT

no idea why this now has me with a RB25!!!

[OFENSV]

did a cylinder leakage test today and all cylinders came up less then 10% leakage so looks like im going to have to remove the head off and block off one of the oil feeds.

i am running an external oil feed to the vct

one thing i dont understand is why doesnt this happen with the rb25, i believe they have larger oil feeds then the rb30 and yet it never had any problems with filling the catch tank in one drag run.

[OFENSV]

if i block off the front feed, wat size should i run in the back one?

[MonstaS4]

Sorry to hijack, but are these restrictors readily available or are they only availible at Nissan dealers. Are they easy to get out?

[exXU1]

Sorry to hijack, but are these restrictors readily available or are they only availible at Nissan dealers. Are they easy to get out?

<{POST_SNAPBACK}>

Cost you about $4.00 each from a nissan dealer , 1.5 mm are available from tommie, .

If you are putting in a smaller restrictor then all you have to do is knok the larger one in and then install the smaller one . Other way round , drill out , much softer than the block , be care full though then use an easy out and remove.

[MonstaS4]

Thanks exXU1, i'm having some blowby issues and as soon as i rule out rings as the problem, i think the head will come off and smaller restrictors put in.

How do i go about blocking one off?

[OFENSV]

are you using an r33 rb25 head with vct?

i believe you just tap a thread and use a grub screw to block it up.

[MonstaS4]

Yep i'm using the VCT head.

I guess the grub screw is the way to go. Is any of this possible without a full dissasembly. If i need to do drilling and tapping, i can't see any way of stopping swarf entering oil galleries.

[exXU1]

Thanks exXU1, i'm having some blowby issues and as soon as i rule out rings as the problem, i think the head will come off and smaller restrictors put in.

How do i go about blocking one off?

<{POST_SNAPBACK}>

Can order blank from nissan , takes about 2 weeks ex japan ,$6.00.

I used a pencil magnet at drilling face and and one in the oil hole in block , when finished use air line to blow up from side block port up thru the area just drilled , lower magnet down the gallery just in case, happy , insert restrictor.