si_mekanik

Ok, i'm almost done with my turbo setup on my 99 Si.

I bought a 1/8 NPT to 3AN 45degree fitting for the feed line that goes into the turbo. The fitting was going in kinda tight, but I made it work. Connected the line, started her up. My line was leaking. Doh! So I fixed my line, and reconnected it, and thats when I saw that the fitting became loose and came out. The threads on the 45degree fitting were kinda toast. The turbo is not 1/8 NPT like my speed shop guy thought.

So I had a 3AN piece fitting laying around that I tried threading in to determine the size, and it fits fine. It threads in all the way, and somewhat tight I think. Is the size on the turbo 3AN?! So I went back to the shop and he sold me 2 fittings that would work, and we would use an O ring around the AN fitting so it would seal on the turbo. The problem is I went to screw it in, and it was too tall and hitting the exhaust inlet flange. Crap.

Anyone know what size fitting this is on the oil feed on the Nissan turbo? 3AN I know it says .48 on the exhaust, and people said they think its .60 on the compressor (2.25 inlet), some say it came off a 280ZX or 300ZX, or possibly an SR20 motor if that helps. THe turbo is also watercooled. Here is a pic

HMT-Admin

hmm, maybe its a metric fitting.. Did you try a 1/8th BSP fitting, it's similar to the 1/8th NPT,

si_mekanik

i dont' hvae one of those, except at my T in the block. I think I found a way to connect 3AN to my 3AN line with adapters and such...we shall see how that goes.

Todd

Abaz what is the difference between the two and where do I find a bsp fitting? Everything I always see is the npt. I hear the npt is bad for the block, will a bsp be a better fitting to use for the feed? Thanks for the help.

mike 94sc2

Hmmm....if your turbo is anything like the nissan turbo I put on my car, the oil inlet is not threaded. You either need the 2 bolt t3 oil flange or tap the oil inlet yourself. But if it is threaded and the AN fitting isnt working then it is NPT.



Mike