Had a friend rev it a little while I checked my oil pressure gauge connections, sounds louder underneath the engine :/

Did you change the oil when you replaced to gasket? If you did. What did the oil look like?

Dark. And it was new oil; maybe 500-1000 miles if that. Redline 5W-30

Any silver streaks in it?

Negative, not even as much as a metal flake, just dark brown.

If it is a lifter. See if you can find some BG- MOA oil additive. If that stuff doesn't solve it, nothing will. It is by far the best oil additive I have ever used.

I’ll get some of that when I get a chance here in the next couple weeks.

Got to record some oil pressure this morning.
Idle:25psi/ 1K:30-33psi/ 2K:55-60psi/ 3K:87psi/ 4K:95psi/ 5K:100psi/ 6K:100psi

Need to post your pressures here.

http://www.the370z.com/engine-drivet...ure-gauge.html

Your pressures are line from what I can see. Mid range is lower then mine. But are with 40 to 332 pressures.

Bringing this back from the dead. Another observation I’ve made since butting about 1500 miles on it since it’s back together. Still runs fine, still makes the noise. However, let’s say I’m on the interstate at 2500 rpms cruising it will be ticking, but as soon as I give the throttle 30-40% the noise goes away, even at the rpms that usually make it.

I am suprised you can hear any under hood mechanical engine noise at speeds above 20 mph.

Now an exhaust leak, yes you could likely hear that at highway speed, an exhaust leak will change with throttle position.

One thing you might try thats easy is to remove the drive belt and start the engine. If noise is gone then you know its one of the accessories or tensioner pulley.

Were you absolutely sure the primary timing chain didn't jump a tooth or two when you were replacing the gaskets? Mine definitely did during the install and my buddy and I turned to each other with matching "o f*ck" looks on our faces...

Yea the chains didn’t move I made marks and zip tied it down. Triple checked before putting everything back. The noise is the same from before I opened it up so I know it’s not the chain.

Just changed oil to a thicker 5w 40. Oil pressure is up a bit and the noise isn’t as loud anymore.

What does your oil pressure look like now?

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Full throttle they look the same but cruising is where it’s different. Just cruising 75-80 it’s at 82 when it would be at or below 75

Well now something happened the oil pressure won’t go over 50psi and the noise is now so loud it’s a banging noise. I guess it’s going to a shop now.

:eek: :confused: :(

Jesus man I'm sorry to hear that. It was running OK before that?

Vid of the banging would be helpful.

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I’ll try to get one in the morning. It’s at the shop now but I haven’t decided if I’m going to have them work on it or not.
The noise doesn’t happen all the time like it used to, just in the 2000-4000rpm range still.
Only on partial throttle past half in that band no noise. Even with the oil pressure low. But partial throttle sounds like a couple of aliens in my engine bay taking cast iron pans to my motor.
Could this be a bad oil pump? What else would cause the sudden drop? I replaced the oil gallery already

Sounds like rod knock. New engine or spin some new bearings in it and see what happens.

Wouldn’t rod knock happen all the time?
What do you honk cause the sudden drop in oil pressure?

No metal in the oil.

Depending on how long ago you did the gaskets, pressure drop could potentially be from a piece of loose permatex blocking your oil pickup.

Bottom-line though, the cost of the shop looking at it is less than the cost of a new engine.

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Ok so there was metallic found this time, they didn’t find it the other week just from looking at it briefly. The sound is coming from the bottom of the engine. So I guess my oil pump hasn’t been the best, now who knows what the damage is inside the motor.
Found an engine with less miles for 1500. Going to hurt.
Lesson learned, these engines need oil pressure gauges. I could have caught the blown oil gallery gaskets before serious damage was done.
At least I got the oil pressure gauge in now, my pockets hurt could have used that money on suspension or something but hopefully this story pushes other to get an oil pressure gauge.
Thanks for all of y’all help through this

Damn son that's a hard hit. But like you said, at least you have the oil pressure gauge! I think it would be worthwhile to have them pull the oil pump and see if it is in fact damaged and/or failing, and if so, whether the cause could be pinned down.

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I'm thinking spun bearing. From low oil pressure. Just wondering if something got into the oil pump.

Years ago. I had a piece of valve seal ruin an oil pump. The motor had about 40,000 miles on it. :shakes head:

I was hoping things was going to work out for you with the gaskets.

If the oil pump is intact good can’t I upgrade the internals on the oil pump to perform like the nismo pump?
And my mechanic will let me back there to look at whatever so if y’all have any questions I can get back there and see what really failed.

Don't waste your your time with the Nismo pump or up graded internals. Get a Sucker Punch pump from MAM.

They are letting me throw in the czp gallery gasket kit in the new engine, so at least I’ll have that security. Be interesting to see the new oil pressures. Government shutdown won’t allow me to do an upgraded oil pump.

So is it common for these engines to burn some oil if they had been sitting around for while?? I’m thinking no....

As in, it is low on oil? Or were the engine faeries burning 5w30 to keep warm at night?

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https://imgur.com/gallery/vVW10SV
It’s been doing this lately slowly worse. And on startup and when I rev it you can see/smell the fairies burning the 5w30 I’m about to get to work and check oil levels. This engine came with warranty which I might use because I’ve been having cylinder 5 miss fires, injector cleaner has helped reduce it. But all of the bank with 1,3,5 will sometimes miss fire.

I wouldn't worry too terribly about those pressure swings, mine does the same depending on how I'm accelerating. Those cylinder 5 misfires tho...

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Right? Surely they checked compression. We put oil back in. Oil pressure it back up and steady. Missfires aren’t too bad but still present

Glad to hear. In my experience, "surely they xyz..." means they sure as hell did not lol.

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Now I’m getting missfires only in 1 and 3 5 has been 0-2 every trip. So it’s got to be a bank issue right? I am going to clean the MAFs and make sure they aren’t lose. And look over the TBs while I’m at it.

That's a reasonable assumption. I'd check all the wiring connectors as well

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