brass vs steel
 

I placed an order for a M18x1.5 to 1/8NPT adapter to be used for installing a oil pressure sensor in the factory oil galley near the TB.

When looking for TQed specs which I still have not found yet :mad0259: I found a post saying to never use brass in a high vibration area as it will come loose and to always use steel.

"Never use brass or aluminum in a high vibration area. (AKA screwed into a block) Steel is always good."

A quick google search for a steel adapter brought me to killer B. Who also can't tell me the tq specs when asked over email...

Does it make sense to order another adapter ? has anyone had experience with either of these adapters or know the tq specs lol

Brass adapter I ordered
https://www.iagperformance.com/prosp...-ej25-engines/

Steel one
https://www.killerbmotorsport.net/m1...pter.html.html

Thank you

Doesn't matter in that application. The vibration mostly comes into play when the part can flex like a tuning fork. Resonance will kill steel just the same as any other metal but it can tolerate limited cyclic strain indefinitely. Think springs. Can't make a spring out of aluminum or brass.

Thanks for the reply. The quote came from a thread about this very application not saying the user is correct just saying

No sweat. One would go insane chasing after all the misinformation on this, or any other forum. It's a great discussion.

I've been using brass fittings for over 6 years, no issues yet. One of them I milled a bit even on the 1/8bpst side because my transducer probe wouldn't fit through the original hole. If I was using a straight fitting with a long transducer or temp sensor on the timing cover, i'd probably spring for steel just for the safety. As Ultra said, application is key.

You can also just search 1/8pst thread torque and get a generic spec. Most of the time this is good enough.

https://www.engineersedge.com/hardwa...tion_13424.htm

I think you said 9-10ft a few years ago. That was the only thing I could find really lol. I guess most just yolo it.

I will start and 10 and check for leaks.

It should be around 1 ftlb depending on how you seal it. You don't want to get it too tight and damage it or pull threads. I know here at work 1/4npt brass in aluminum we do 18 in-lb. It's tapered so it locks up quick without much torque.

smartypants

1ft pound ?? Just 1 lol I think 10 is the lowest my tq wrench goes lol

If you go off the chart I linked, it is 2-3 turns past finger tight with sealant. I have in-lb torque wrenches for things like fittings.

Nah. Even I knew you were wrong. :p

https://www.americanelements.com/alu...ring-7429-90-5

Aluminum and brass springs are very limited use. Brass isn't uncommon as a spring but it has to be heavily alloy'd.

Ok ok... Can't make a typical spring out of aluminum or brass.

https://media-cdn.tripadvisor.com/me...db/91sofie.jpg