From what I have searched, AMS remote line has a 3/8 NPT thread, some people use taflon tape to fit it directly into 3/8 BSPT. But I would rather to use an adapter. I will call AMS next week to confirm what thread it has.

 

Is the stm remote line the same as ams? I just bought the stm remote line.

 

I have the STM line waiting to go on as well, nothing was ever mentioned of it not being the correct fittings on either end.

 

According to the site. One End is 1/8 NPT and the oil filter housing side is 3/8 BSPT.

Seems like the guys with the STM line are good to go. Still use sealant though.

 

Yea probably special order at a machine shop.

Nah its 3/8 BSPT. I have installed it myself but make sure by contacting AMS.

Yes, its a blatant copy of the AMS product.

 

To be fair, it's kinda impossible to not "copy" something as simple as an oil line.

 

I called AMS. They said it's a 3/8 NPT. That's weird.

 

This has been debated in the past. AMS is wrong its not NPT but rather BSPT. The thing is that with pipe dope and the tapered fitting the threads are close enough that it may work but it is not NPT.

 

Correct, and then they end up leaking a drop or two every couple of weeks.

 

AMS is saying their line is NPT? But it's BSPT? So it's a direct fit, but they are saying it's not? And if it is, why would it leak?

 

Well, it gets a little specific after that. As you know, BSPT is a tapered British pipe thread and NOT a direct fit to National pipe thread. Since Bspt threads are cut at 55 degrees with a rounded trough and NPT are cut at 60 degrees with square troughs. From what I understand, if AMS is truly using an NPT fitting, they are relying on a combination of high temp thread sealant and the softness of the cast aluminium threads of the OFH to create a good enough seal for this to work. These fittings are not strictly cross compatible.

 

I know all that, but Heel2toe is saying their line is BSPT. If it were then why would AMS say it's NPT?

 

STM did mentioned that their remote line has a 3/8 BSPT thread. I'm gonna go with STM line. It's only 15 bucks more than AMS.

 

Ah, I see what you're saying. That confused me for a bit

 

Lol sorry I guess I can see how my comment was confusing. Let me try again...I have no idea what size fitting AMS has for their line. If they say its NPT then I would believe that it is NPT. That being said National Pipe Thread is the incorrect threads for our OFH and the correct size is instead 3/8 BSPT. Pal expanded on what I was getting at and this is the reason why this has been debated in the past because people have the false sense of reality thinking that it is NPT since it will thread in and when you goop it up and soft AL threads or brass threads for a fitting ends up potentially sealing.

However its still not NPT so get the right fitting. Personally I purchased the STM remote sending unit line which included the proper fitting and hey guess what, it doesn't leak!