RB25 oil feed, oil return, and coolant return thread pitch

Discuss the RB20, RB25 and RB26 series engines.
integra7
Posts: 122
Joined: Sun Oct 16, 2005 11:42 am
Car: 1995 Nissan 240sx

Post

does anyone know what the the block fitting sizes are for the following...

turbo oil feed: ??turbo oil return: ??turbo coolant return: ??

it looks like the oil feed is M12x1.25...

does anyone know the fitting sizes from experience???


User avatar
BoostFab
Posts: 3529
Joined: Wed Dec 03, 2003 8:23 am
Car: S13cp, S13fb, S14z
Location: Nismo Land
Contact:

Post

no one make such adapter

i do, however have some left....it will adapt oil feed port on the block and run -4 AN braided lines. email me if interested.

i will soon put together a turbo oil line kit ...

here's a related post: zerothread?id=140100


cvc9216
Posts: 304
Joined: Thu Mar 06, 2003 5:26 pm

Post

--turbo oil feed: M12x1.25--turbo oil return: I think it's 3/4 BSPT but a 3/4 NPT fitting is damn close and worked fine for me with some teflon tape (I used aluminum fitting instead of steel just to be safe)--turbo coolant return: M14x1.5


User avatar
kevsster
Posts: 32
Joined: Wed Aug 17, 2005 12:57 pm
Car: 90' 240sx

Post

I got some of the banjo bolts off a Z32 TT and they worked. There are a couple tho so you just have to make sure you get the right one. They were about 5 bucks from my local Nissan dealer. Same for the bolts on the turbo.

ehacker01
Posts: 157
Joined: Fri Feb 04, 2005 5:01 pm
Car: 1995 240sx
Contact:

Post

BoostsFed wrote:no one make such adapter

i do, however have some left....it will adapt oil feed port on the block and run -4 AN braided lines. email me if interested.

i will soon put together a turbo oil line kit ...

here's a related post: zerothread?id=140100
You can get a m12x1.25 banjo with either a -3 or 1/8" out from any motorcycle parts retailer. Autometer also makes a 1/8npt to m12x1.25 banjo adapter.

User avatar
BoostFab
Posts: 3529
Joined: Wed Dec 03, 2003 8:23 am
Car: S13cp, S13fb, S14z
Location: Nismo Land
Contact:

Post

ehacker01 wrote:You can get a m12x1.25 banjo with either a -3 or 1/8" out from any motorcycle parts retailer. Autometer also makes a 1/8npt to m12x1.25 banjo adapter.
the point is to get rid of the banjo entirely. my adapter is just that---no banjo to deal with.

Bluefire
Posts: 1130
Joined: Fri Jun 06, 2003 6:07 am

Post

Earl's has these fittings... since they are the same for the sr. They are adapters from metric to either -3 or -4, I forget. They also have adapter fittings for the water lines to -6. I know for a fact the earl's store in los angeles has them, but not sure if other stores will have them

-Bluefire

Bluefire
Posts: 1130
Joined: Fri Jun 06, 2003 6:07 am

Post

Oh and if for some reason they don't know what your talking about just tell them you need the adapters for the nissan sr20det motor. They are the same for the RB's

integra7
Posts: 122
Joined: Sun Oct 16, 2005 11:42 am
Car: 1995 Nissan 240sx

Post

cvc9216: thanks for the info, I assumed the oil return was 3/4" BSP but just wanted to confirm.

Boostfed is right....I don't want any banjo fittings at all. I want to use all AN fittings with Earl swivel seals and hoses. This is why I am looking for these adapters.

Anyways.....this is what I found....

oil return: 3/4" BSP to -10AN adapter at available at http://www.batinc.net, can't find anyone else that sells this. here's a direct link to the pdf file from their site: http://64.202.180.37/files/un816.pdf (second page, first item)

oil feed: M12 x 1.25 to -6AN adapter, Earl makes this fitting (part# 991945). You may not want to run -6AN because thats pretty big for an oil feed line, so you can get Earl's -6AN to -4AN reducer (part# 989464) and run -4AN lines.

coolant return: M14 x 1.50 to -8AN (part# 9919EFH)M14 x 1.50 to -6AN (part# 9919DFH)M14 x 1.50 to -4AN (part# 9919BFH)Just choose the one you want based on the hose size that you want to run. However, I will be running an aftermarkey turbo so I am looking to plug up this port in the block. So I plan to get the M14x1.50 to -4AN adatper and then get a -4AN cap.

Hopefully this will help someone else out. If I made any mistakes, please let me know so I can correct it.

cvc9216
Posts: 304
Joined: Thu Mar 06, 2003 5:26 pm

Post

Here is what I used:

oil feed: Greddy M12x1.25 to 1/8" BSPT adapter (available from SPLparts), then a brass 1/8" NPT to -3 adapter (NPT rethreaded to 1/8" BSPT)

oil return: 3/4 NPT to -10AN, http://cgi.ebay.com/ebaymotors...wItem

coolant return: M14x1.5 plug. I think I have some extras if anyone needs one

User avatar
BoostFab
Posts: 3529
Joined: Wed Dec 03, 2003 8:23 am
Car: S13cp, S13fb, S14z
Location: Nismo Land
Contact:

Post

Quote »oil feed: M12 x 1.25 to -6AN adapter, Earl makes this fitting (part# 991945). You may not want to run -6AN because thats pretty big for an oil feed line, so you can get Earl's -6AN to -4AN reducer (part# 989464) and run -4AN lines.[/quote]

Quote »oil feed: Greddy M12x1.25 to 1/8" BSPT adapter (available from SPLparts), then a brass 1/8" NPT to -3 adapter (NPT rethreaded to 1/8" BSPT)[/quote]why go through all that while my adapter is just one piece and done, M12 AN-4). hmmm??!?

integra7
Posts: 122
Joined: Sun Oct 16, 2005 11:42 am
Car: 1995 Nissan 240sx

Post

how much? picture?

User avatar
BoostFab
Posts: 3529
Joined: Wed Dec 03, 2003 8:23 am
Car: S13cp, S13fb, S14z
Location: Nismo Land
Contact:

Post

integra7 wrote:how much? picture?
please email me.


Return to “RB20DET / RB25DET / RB26DETT Forum”