savageskaterkid Posted May 7, 2006 Share Posted May 7, 2006 I have searched this but to no prevail. I plan on running a turbo feed line from the oil pressure sensor location with a T-fitting. So I can still use my pressure sensor, and not have to drill and tap a hole in the pan. But I need to know the size of the hole and threads in the sensor hole. Can anyone tell me this? Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted May 7, 2006 Share Posted May 7, 2006 I asked this same queston a couple weeks ago it's an M10x1.75 i believe fine thread metric -Ed Quote Link to comment Share on other sites More sharing options...
srgunz Posted May 7, 2006 Share Posted May 7, 2006 I don't think I have ever heard of a metric tapered pipe thread. So I doubt its a M10. Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted May 7, 2006 Share Posted May 7, 2006 Its a BSPT/NPT 1/8". Dave Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted May 8, 2006 Author Share Posted May 8, 2006 awesome, and what would be a good size to run for the turbo feed line? The same size as the hole, smaller, bigger? Would this be a coarse or fine thread? Quote Link to comment Share on other sites More sharing options...
veritech-z Posted May 8, 2006 Share Posted May 8, 2006 pipe thread doesn't work like that with the coarse thread and fine thread. pipe thread is tapered so that cranking it down creates a seal at the back end. what i would do is try to find a 1/8th npt adapter to run a -6an line to the turbo inlet, and get the largest drain you can fit. i belive that -6 line is 3/8", and a good return line size would be -8 which is roughly 1/2" in standard size. you can get bulkhead fittings like on a fuel cell that allow you to drill out the pan and and install the adapter to connect to the drain line. you'd probably want to epoxy it though just to be sure it doesn't leak. Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted May 9, 2006 Share Posted May 9, 2006 It is BSPT 1/8 - 28 TPI British Standard Pipe Thread. Not NPT (1/8 - 27 TPI) TPI is the pitch of the thread in threads per inch. They are two different threads. The pitch is very close, and cranking in a NPT fitting with sealant will (most of the time) work. Once. BSPT fittings are hard to find in N America. The block can be retapped to 1/8 NPT easily. AN3 line will work for the turbo, or 3/16 solid line. No way you need an AN6 supply line. 1/2 is the smallest I would use for turbo return to pan. AN8 or AN10 will work. Doug Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted May 9, 2006 Share Posted May 9, 2006 Good point Doug. I knew they were close, and I know that one of the sizes match both size and thread pitch in both BSPT and NPT and I thought it was 1/8. Nevermind. You could also consider re-dieing the fitting to BSPT assuming the dies are easier to get a hold of than the NPT tap. I run -3 turbo feed line and -12 return. Dave Quote Link to comment Share on other sites More sharing options...
veritech-z Posted May 9, 2006 Share Posted May 9, 2006 Sorry for the bum advice savageskaterkid, i stand corrected on the feed line size. I thought I had read in maximum boost or somewhere that 3/8" was a good tube diameter, but if you guys are running 1/4" (-4) and smaller with no problems, then all the better since -4 hose is cheaper by the foot (at least here in tampa) than the other sizes. I haven't gotten my turbo installed yet, and am also in the process of putting together all the ancillary pieces to the system. 1/8th npt taps aren't that hard to come by in the states, you can get them at most hardware stores. i got one from harbor freight as part of a set. Does the feed line need to be flexible on this engine, or could you use say one of those aftermarket brake lines that already has the 1/8" npt fittings on the end that you bend yourself? Hey savageskaterkid, i reread your first post, and it sounded to me like you were going to try to avoid tapping the pan? You don't tap the pan for the feed line because there is no pressure there. You run the return line there so the oil can drain back into the system. That's why you want a larger drain line, to reduce the restriction to flow (unless you have a scavenger pump of some kind, gravity is what is getting the oil back to the pan), and you want to make sure that the drain is above the level of the oil in the pan so it doesn't get backed up, so i've been told. Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted May 9, 2006 Share Posted May 9, 2006 well then for some crazy reason both my blocks, F54 and N47 have the oil fitting hole that a metric bolt screws into very smoothly. -Ed Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted May 9, 2006 Share Posted May 9, 2006 Ed, M10x1.75 is not a fine thread at all. In fact 1.75 is a very coarse thread. 27/28 thread pitch is closer to 0.9mm/rotation. Maybe your block was retapped by someone else? Dave Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted May 9, 2006 Share Posted May 9, 2006 Update, I don't think you can even buy M10x1.75. Did you mean M10x0.75? Dave Quote Link to comment Share on other sites More sharing options...
jt1 Posted May 9, 2006 Share Posted May 9, 2006 The 1/8 NPT and M10 x 1.0 are very, very, very close, except the NPT is tapered. John Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted May 9, 2006 Author Share Posted May 9, 2006 Sorry for the bum advice savageskaterkid' date=' i stand corrected on the feed line size. I thought I had read in maximum boost or somewhere that 3/8" was a good tube diameter, but if you guys are running 1/4" (-4) and smaller with no problems, then all the better since -4 hose is cheaper by the foot (at least here in tampa) than the other sizes. I haven't gotten my turbo installed yet, and am also in the process of putting together all the ancillary pieces to the system. 1/8th npt taps aren't that hard to come by in the states, you can get them at most hardware stores. i got one from harbor freight as part of a set. Does the feed line need to be flexible on this engine, or could you use say one of those aftermarket brake lines that already has the 1/8" npt fittings on the end that you bend yourself? Hey savageskaterkid, i reread your first post, and it sounded to me like you were going to try to avoid tapping the pan? You don't tap the pan for the feed line because there is no pressure there. You run the return line there so the oil can drain back into the system. That's why you want a larger drain line, to reduce the restriction to flow (unless you have a scavenger pump of some kind, gravity is what is getting the oil back to the pan), and you want to make sure that the drain is above the level of the oil in the pan so it doesn't get backed up, so i've been told.[/quote'] No problem at all, I got the piece no problem though. The point of this thread was to find out about the threads on the oil pressure sensor so that I can put a T-fitting in it so I can still use the pressure sensor and be able to run the feed line. Since the sensor reads there is pressure, then there should be no problem in the pressure sending oil up the line, correct? I do not want to drill and tap the pan for the feed line, just becuz it will be a PITA and a bit of a hassle with my limited tools. The return line will probly be fed right into the valve cover to tell you the truth, because of the ease to get it off and I can get the taps that I need for it. Would the valve cover be a good place for the return line? Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted May 10, 2006 Share Posted May 10, 2006 Whoa-Stop-Halt. You will be drilling your oil pan for the turbo oil return unless you have a scavenge pump to pump oil away from the turbo. Turbos need a big oil return line that gravity-feeds away from the turbo. If oil can't easily get away from the turbo, it will end up going around the bearings and seals(piston rings)in the turbo and into the intake airstream or the exhaust, creating big problems. The valve cover would not be a good place to try and return turbo oil. For the oil pressure supply, the stock pressure sender hole is a great place to tee in for the turbo. That is where the factory teed in to supply the turbo on the ZXT. There is a nice little block on the ZXT engine that has the correct threads and a flare fitting for a rigid oil line to the turbo. Seriously, Your best bet would be to get a ZXT engine with all the goodies and drop it into your S30. Finally - You can't drill and tap the oil pan and get oil pressure because there is no oil pressure in the pan. It is created by the oil pump, which sucks oil out of the pan via the pickup and pumps it through the oil filter and into the main oil gallery in the block, which is where the oil pressure sender lives. Doug Quote Link to comment Share on other sites More sharing options...
srgunz Posted May 10, 2006 Share Posted May 10, 2006 BSP fittings and adapters available here: http://www.pegasusautoracing.com/productselection.asp?Product=3230 Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted May 10, 2006 Author Share Posted May 10, 2006 hmmmm, is there another place to run the return line to, other then the pan? Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted May 10, 2006 Share Posted May 10, 2006 BSP and BSPT are two different threads which have the same pitch and major diameter. BSP- Straight thread, requires a sealing oring or crush-washer. BSPT- Tapered thread, self-sealing. Doug Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted May 10, 2006 Share Posted May 10, 2006 hmmmm, is there another place to run the return line to, other then the pan? In a nutshell - no Doug Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted May 10, 2006 Author Share Posted May 10, 2006 If there was oil pressure coming up from the feed line, then wouldn't there be oil pressure throughout the turbo too? So wouldn't the pressure actually force the oil out of the turbo too? Quote Link to comment Share on other sites More sharing options...
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