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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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08-17-2023, 12:56 PM | #1 |
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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 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
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08-17-2023, 01:09 PM | #2 |
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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.
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08-17-2023, 01:15 PM | #3 | |
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08-17-2023, 01:18 PM | #4 |
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No sweat. One would go insane chasing after all the misinformation on this, or any other forum. It's a great discussion.
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08-17-2023, 01:58 PM | #5 |
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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
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08-17-2023, 02:16 PM | #6 | |
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I will start and 10 and check for leaks.
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08-17-2023, 02:56 PM | #7 |
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Wait until my Flex capacitor hits 88
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08-17-2023, 02:58 PM | #8 |
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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.
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08-17-2023, 03:27 PM | #9 | |
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08-17-2023, 04:21 PM | #10 |
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1ft pound ?? Just 1 lol I think 10 is the lowest my tq wrench goes lol
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08-18-2023, 11:25 AM | #11 |
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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.
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08-18-2023, 12:50 PM | #12 |
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08-18-2023, 01:08 PM | #13 |
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Aluminum and brass springs are very limited use. Brass isn't uncommon as a spring but it has to be heavily alloy'd.
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08-18-2023, 03:33 PM | #14 | |
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