Could you PM me your email address and I'll get the ROMs out today to you. Thanks

 

I am not sure if this was discussed but what tap are people using for this bung? According to B&M motorsports the sensor has a 3/8" - 18 NPTF thread pitch. Are people using an NPT tap? I read up on NPT vs. NPTF and it seams NPTF is a mechanical seal versus one that requires thread sealant. I also read conflicting information about using one with the other. I dont mind buying the NPTF tap but i have the NPT tap available.

Thanks in advance

 

NPT = national pipe thread
NPTF = national pipe thread female
NPTM = national pipe thread male

So NPTF is just a way of saying female threads vs male threads. All NPT connections should use some kind of sealant/lubricant when installing the sensor. Teflon tape is fine for to use on the intake manifold.

 

Oh that is not what i found. According to the web (http://www.cutting-tool-supply.com/T...PTVsNPTF.htm):
NPT = National Pipe Thread
NPTF = National Pipe Thread Fuel

NPT Vs. NPTF Taper Pipe Threads

The two most common taper pipe threads used in the United States are NPT and NPTF. Applications range from electrical conduits and hand railings to high-pressure pipe lines that carry gas or caustic fluids. NPT threads are for mechanical or low-pressure air or fluid applications and require the use of sealing compounds like Teflon tape, to provide the seal. When the application is more critical, and the sealing compound may fail due to high heat or pressure, NPTF Dryseal threads are used. This mechanical seal is produced by the mating and slight crushing of the threads when a wrench is applied to tighten the fittings.

Visually, both threads appear to be identical. Both have a ¾” taper over one foot of length. Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths. However, there is a subtle difference in the thread form that differentiates the two. The major and minor diameters of both threads differ slightly. With NPT threads, after a wrench is applied, slight spaces at the major and minor diameters may exist that would allow the assembly to leak and therefore a sealing compound is used to fill any gaps. On the other hand, NPTF threads are designed to ensure that sufficient crushing of the entire thread form will take place to produce a mechanical seal.

How does the difference in thread forms effect the tooling used to produce NPT and NPTF threads? Taps are available for both NPT and NPTF threads having the appropriate form to produce each type of thread. Since NPT threaded parts require sealing compounds, it is acceptable to use an NPTF tap for NPT applications. However, NPT taps cannot be used for NPTF applications, as it will likely produce a thread that will leak. The same is true of external threads. In most cases the tap drill is the same for both forms.

The most significant difference in the two threads is the inspection required. Since sealing compounds will be used for NPT threads, only a single plug with a step, known as an L1 plug (internal thread) or a single thin L1 ring (external) are required to check size. However, since the taper and the position of major and minor diameters are so critical to the sealing of NPTF threads, the additional threads in the assembly known as L2 and L3, and the major and minor diameters are inspected with either special plug or ring gages.

 

Use a tapered pipe thread. Tap it just enough so that you can get 1 whole thread of the sensor in and then firm up with your hand. With no sealant this should be air tight. I used 400 degree JB weld around my sensor to "back it up" and make it stronger etc....

 

Dang, I never knew there was such a thing as NPTF. I've always used NPTF to represent female NPT when I place orders from my supplier. (I know its always been NPT threads that I've received because that's all that my supplier sells.) The whole "low pressure" thing for NPT is not entirely accurate. NPT threads with an appropriate sealant are routinely used for high temperature high pressure operation. I've used lots of NPT fittings in high pressure, high temperature water systems (3000 psi and 475F) that have been operating almost continously for the last four years.

Anyhow, I used a standard female NPT bung from Summit Racing and assembled it with teflon tape. Should be fine to use an NPT tap. You could skip using the teflon tape if you wanted, but the stuff really does work and it helps prevent seizing.

 

oh i have no problem using tape or thread sealant. I just wanted to make sure i was using the right tap.

Thanks guys!

 

Don't skimp, use plenty of JB weld /DSM'er

 

I've got the patch done for 96530006. I'll try to post it on Sunday in a new thread.

 

Sweet, perfect timing, thanks.

 

great work. i'm sure for the reasons of scaling etc it makes it much easier to install the recommended GM IAT sensor. however, i've already got an Autronic IAT sensor plumbed in and not doing anything. what information would i need to find out about the sensor to see if it's compatible and what scaling i should use if necessary.
thanks

 

Perfect timing to say the least. I'm about to put the car down for the winter & take care of a few projects. This sensor was one of them, It's good to know I'll be able to put it to use when I get it all back together

 

I hate to say it, but making this sensor compatible would be at the very bottom of my list, probably forever. What are the thread dimensions of the Autronic sensor?

 

Mr. Fred, you available? I'm having some issues with the patch and DLCs regarding EVAp, Baro sensor, etc... I'm going to double check all the entries that are required into the ROM to make sure it wasn't my mistake.

 

PMed you.