cardriverx

iTrader: (12)

What size drill bit do I need to get for a 3/8 NPT tap?

cjernigan

iTrader: (13)

9/16

Ben

iTrader: (33)

37/64" would be ideal.

cjernigan

iTrader: (13)

Man 64s bits are such a PITA to find though in comparison.

Braineack

iTrader: (62)

1/2" + .07" :gay:

Joe Perez

iTrader: (8)

http://www.use-enco.com/CGI/INSRIT?P...PARTPG=INLMK32

Savington

iTrader: (31)

www.google.com

we have some noob-*** ************* on this forum. Phillip, you're slackin, buddy.

cardriverx

iTrader: (12)

I used a 9/16. Thanks guys!

Saml01

iTrader: (9)

Can I please get some education on drilling and tapping.

What is the relationship between the sizes when picking the fitting, the tap, and the drill bit?

Braineack

iTrader: (62)

google "drill tap size chart"

drill the hole too big and your threads might not be large enough, too small and the tap might not even fit in the hole!

Saml01

iTrader: (9)

http://www.icrank.com/cgi-bin/pagema...rt_npt.htm&t=2

3/8-18? So the drill bit is a 9/16. How is the tap selected?

Braineack

iTrader: (62)

if you got a 3/8 npt fitting, then you want a 3/8 npt tap. then it's just choosing the appropriate drill bit for the tap.

Saml01

iTrader: (9)

Thats sweet.
Thanks man.

Saml01

iTrader: (9)

Question. I was reading in the MS forum that the IAT sensor also uses a 3/8 NPT.

So thats the oil return, and the IAT that uses a 3/8 inch NPT. What else uses a 3/8 NPT. I ask because then its simpler for me to just get one, and use it for everything that needs to be screwed in.

While we are on the topic of fittings, is 3/8 enough for oil return?

Even better question, how do I know what size fittings the turbo needs? The oil feed is threaded while the return is not, and the water is threaded.

Savington

iTrader: (31)

You can use it for the IAT, oil return, idle air valve fitting, and you might be able to get away with it for the BOV fitting as well, although 1/2NPT is preferred for that just due to size and airflow requirements.

Saml01

iTrader: (9)

Im sorry, just to clarify, you mean the signal to the blow off valve?

Also, can I use it to put a fitting into the outlet from my compressor, it doesnt come with one and id like to keep the boost controller close to the turbo and the actuator.

Joe Perez

iTrader: (8)

Yes. I am using a 3/8 NPT to -10AN fitting, and it drains just fine. The actual amount of oil flowing through the turbo is amazingly small.

cardriverx

iTrader: (12)

He means where the BOV acually mounts on the pipe.

Saml01

iTrader: (9)

Hmm, I cant picture this in my mind. But ok, ill take your word for it.

Savington

iTrader: (31)

Yeah, where the BOV mounts. Instead of using a silicone coupler with a 1" fitting or something, I used a 1/2" NPT to 3/4" pipe thread fitting, some high-temp silicone sealant, and a small length of 1" heater hose. Coat the 3/4" threads with the silicone, push the 1" hose onto the threads, install BOV in the other end, run signal line up to the cruise control fitting, and let the silicone dry overnight, and you're done. It could leak like a ****, but I don't care because my car is running a MAP sensor.