Rb25Det Oil Restrictors?

[ricardo.benin]

Hi I was looking at my rb25det block and I tried to take a measurement on it any way my micrometer is is to big to measure the oil restrictors. So my question is I am trying to find out if these oil restrictors are stock or after market I came up to a number that seems to small to be stock, the measurement is around .055 which is about 1.40mm so I am not sure if these are stock or not. The number I came up with is probably off as I can not get a accurate measurement.

Thanks
Richard

[GTSBoy]

#1 tip. Buy some drill bits at 0.1mm step sizes to use as feeler guages. Relatively cheap way to measure really small holes.

Yes, restrictors in the 1.55mm range are almost certainly not stock. Have you read the oil control thread?

[Ben C34]

What micrometer where you using anyway? Do you mean vernier calipers? I haven't seen an internal mic that can measure that small.

[ricardo.benin]

I have read the oil control thread but blocking one feed and restricting the other does not sound like a good idea to me as I am running the car as a street car and hydraulic lifters. People say well the rb26dett has smaller restrictors and one oil hole blocked off but the 26 had solid lifter and not hydraulic lifters like the series 1 and 2 rb25det which means the lifters need a lot of oil. I am thinking of running a line from head to sump but not sure about the restrictors or blocking off a oil hole.

Hi Ben C34 I was using a vernier calipers.

Thanks

Richard

[GTSBoy]

There is a summary of sorts near the end of the oil control thread which brings together the best advice. The best advice does depend on usage - ie which oil pump and so on. So you have to read that stuff and apply to the setup you have in mind.

[KiwiRS4T]

Can't believe you're still thinking of running a line from the head to the sump after reading the thread.

Don't forget vct supplies some oil to the top but if you are not keen on blocking off one of the oil supplies you can do what I did - fit 2 x 1.0mm restrictors.

[ricardo.benin]

Hi KiwiRS4T do you have hydraulic lifters, BTW I like your idea on running 2 x 1.0mm restrictors, so do I put the 1.0mm restrictors in the middle and rear oil feeds. BTW when I looked at the restrictors on the tomei website it says do not use restrictors in conjunction with the hydraulic lifters which seems not to be correct.

Thanks

[KiwiRS4T]

Hi KiwiRS4T do you have hydraulic lifters, BTW I like your idea on running 2 x 1.0mm restrictors, so do I put the 1.0mm restrictors in the middle and rear oil feeds. BTW when I looked at the restrictors on the tomei website it says do not use restrictors in conjunction with the hydraulic lifters which seems not to be correct.

Thanks

Front and rear leave the VCT alone. What kind of oil pump are you using? What are you using the car for - track only? Street car? Circuit track days?

Actually mines on an RB30 block with an RB25DET head with hydraulic lifters and an external supply to the VCT.

Never mind Tomei get the restrictors from me!

[Ben C34]

It's funny you are ok running 2 1mm restrictors and against one 1.5 and the other blocked. It works out virtually identical surface area.

[ricardo.benin]

Hi KiwiRS4T I plan to run the car street only but I do want to try and make 500hp. Btw what is a external supply to the vct also I will buy the restricts from you once I find out exactly what size the restrictors I have right now are.

[Ben C34]

You only need the external supply due to the rb30 block not having a vct feed.

In your case it doesn't apply.

[ricardo.benin]

Oh ok

[89CAL]

Ive got the one blocked and the other is 1.5mm and I have no issues. I ran 15w50 and the lifters had a little noise for a few seconds after startup but switched back to 10w40 and it is happy as

[ricardo.benin]

I am probably going the route kiwi mentioned using 2 x 1mm restrictors instead of blocking off the one port.