Removal Of Block Oil Restrictors

[Cubes]

Hi ppls,

I am soon to rip the head off, replace valve springs, headgasket and oil restrictors.

I attempted to remove the oil restrictors out of a spare rb30e I have in the shed. I failed.

How are these removed? Is it possible to remove and install new without removal of the motor/sump?

I have seen other (non rb) blocks where the oil restrictor have a thread located in the top section of the restrictor, this allows easy removal.

[rob82]

Hi ppls,

I am soon to rip the head off, replace valve springs, headgasket and oil restrictors.

I attempted to remove the oil restrictors out of a spare rb30e I have in the shed. I failed.

How are these removed? Is it possible to remove and install new without removal of the motor/sump?

I have seen other (non rb) blocks where the oil restrictor have a thread located in the top section of the restrictor, this allows easy removal.

Drill and tap.

[Cubes]

Figured as much.

My main concern with drill and tap is leaving metal filings in the block.

I could grab a hoover or something as I drill or make an attachment to fit down the galley after its removed to suck out any possible filings but its always a worry.

Any suggestions?

[GTRgeoff]

No guarantee but very strong magnets like out of a broken hard drive. I've used them to drill and ezy out cam cap bolts that have broken.

[Cubes]

Hopefully I don't have to report that engine failure Geoff.

I'm going to rip the ones out of the vl block and see how far I can push the old restrictors down. If the galley doesn't taper or do anything silly I will push the old ones down and simply drop the new ones on top.

While on the topic.. I've been told the RB26 Tomei headgasket kits from nengun come with the restrictors. RB25/rb20 doesn't. Yet they have similiar price.

Is this really the case or do the tomei restrictors have to be purchased seperately?

Either way I'll drop nengun an email and post back my findings.

[Roy]

Hopefully I don't have to report that engine failure Geoff.

I'm going to rip the ones out of the vl block and see how far I can push the old restrictors down. If the galley doesn't taper or do anything silly I will push the old ones down and simply drop the new ones on top.

While on the topic.. I've been told the RB26 Tomei headgasket kits from nengun come with the restrictors. RB25/rb20 doesn't. Yet they have similiar price.

Is this really the case or do the tomei restrictors have to be purchased seperately?

Either way I'll drop nengun an email and post back my findings.

Can you use a 26 gasket with a RB25DE head?

[Cubes]

You can indeed.

The rb26 head bolts are slightly larger, this is the only difference between the headgaskets.

[Bl4cK32]

and the r32 rb26 head doesnt run vct either. oil/water galleries would be similar to r32 rb25de? Cylinder size is the same...

Solid lifters are always a bonus.....

Wonder if i should sell my fully rebuilt and ported head, and go the gtr head....? Depends...

[Cubes]

All depends on Money Darren.

[Bl4cK32]

yer well im living in my happy place where money is no problem

Now, time for another Beam....

[MonstaS4]

I just punched the old restrictors down and put the tomei's on top. So no, the gallery dosen't taper.

[Roy]

and the r32 rb26 head doesnt run vct either. oil/water galleries would be similar to r32 rb25de? Cylinder size is the same...

Solid lifters are always a bonus.....

Wonder if i should sell my fully rebuilt and ported head, and go the gtr head....? Depends...

This is where i am confused. I can get VG30DETT lifters for lsightly cheaper then what Tomei sell their kits for. It would be cool to run 260/10.25mm cams.

The theroy say that solid cams will make more power because they accelerate open/closed quicker, they are lighter etc. But the cost of doing it, only to have to shim/long term maintenance etc...well????

If i spend the same money on the combustion chamber and ports, and stuck with the 260/8.5mm cam ( a cheaper option),how much less power, if any, would it make????

Does having large lift cams hurt velocities/cylinder filling at low rpm like large duration cams???

oh, and this is on topic as ,umm, because when you run oil restrictors, ...well the hydraulic lifters also use oil

[discopotato03]

Hi all , correct me if I'm wrong but aren't the oil restrictors made of brass ? I seem to remember AJ removing one from an L series block by screwing a self taping screw into it and pulling it out with a slide hammer . I dont think the interference fit is real tight .

Cheers A .

[Bl4cK32]

Does having large lift cams hurt velocities/cylinder filling at low rpm like large duration cams???

I think this may answer some q's Roy.

http://www.overboost.com/story.asp?id=1132

Especially the 2nd to last paragraph, that says : Synchronizing lift with piston speed keeps airflow at optimal velocities through the ports

[proengines]

If you're just pulling the head off and fitting the restrictors just tap the original restrictor down with a pin punch and put the new one in on top of it.

[Cubes]

Awesome.

I'm a happy man.

I've since discovered the tomei restrictors are 1.5mm.

RB30 are 1.8mm

RB26 are 2mm

RB20/25 are 2.4mm

Thanks.

One last question... Does the rb26 tomei headgasket kitcome with 2 restrictors?

Running the hydraulic head I need to keep the two.

[proengines]

Awesome.

I'm a happy man.

I've since discovered the tomei restrictors are 1.5mm.

RB30 are 1.8mm

RB26 are 2mm

RB20/25 are 2.4mm

Thanks.

One last question... Does the rb26 tomei headgasket kitcome with 2 restrictors?

Running the hydraulic head I need to keep the two.

nope, they come with one. They are a very easy thing to make though.

[Cubes]

No drama's... I am able to get my hands on another easy.

Proengines.. Whats your view on 2 x 1.5mm restrictors?

Obviously I won't hold you to anything you say as I doubt any one has actually tested, so its an unknown.

But technically speaking, does the hydraulics really need much more oil over its big brother solid?