of course its knocking. ;(

GaleForce · 11-05-2012, 03:08 PM

Quote:

Originally Posted by Mitco39

Just so I am on the same page as everyone. Knocking on these engines typically means a bent rod right?

Now is not the time for you to worry about that.

elperuano · 11-05-2012, 03:41 PM

Doesn't it lean more towards knock if it gets louder while under load or driving? But knock u should be able to hear from the top correct?

ANMVQ · 11-05-2012, 04:28 PM

Quote:

Originally Posted by Dembflyr

Maybe an exhaust leak. Have you removed the O2 sensors? Or have you had the headers out? It doesn't sound like a knock to me either but it's tough to tell on video.

No man. Never had the manifolds or O2'S out at anytime.

Nixlimited · 11-05-2012, 04:29 PM

Quote:

Originally Posted by Mitco39

Just so I am on the same page as everyone. Knocking on these engines typically means a bent rod right?

No, not at all. It means there is pre-detonation of the intake charge i.e. before the spark plug fires. The "knock" is the shockwave that go back through the engine.

Mitco39 · 11-05-2012, 04:45 PM

Quote:

Originally Posted by Nixlimited

No, not at all. It means there is pre-detonation of the intake charge i.e. before the spark plug fires. The "knock" is the shockwave that go back through the engine.

Right, but people seem to refer to a knock of this type to be a sign of a bent rod. Surly this engine is not detonating at idle.

Zoren 370 · 11-05-2012, 05:11 PM

Sounds like more on the valve's has anyone adjusted the gaps of your valves?
Or it could also one of the rocker arms is loose.
Doesn't sound like a knock

edub370 · 11-05-2012, 05:20 PM

Quote:

Originally Posted by ANMVQ

O first to answer everyone at once. Oil level is full, had it changed last week . I can not hear it from the top of the motor only down behind the passenger tire. i like some off the replies its not knock. But if it was the timing chain should I hear it up top also?. And yes the noise is there at idle but will get louder driving.

.. i hate to say it, but that is prolly knock...

lifter tick usually quiets down as rpm (and oil pressure) rises

ANMVQ · 11-05-2012, 05:28 PM

Hey no one has had part of the top of the motor apart . if the valves where ticking I would hear it on top also. top of the motor is no noise at all just on the bottom.

Boosted Performance · 11-05-2012, 05:42 PM

To me that sounds like rod/bearing knock. I had an engine tha spun a bearing due to oil starvation (not a VQ) and it sounded just like that. It is a mechanical issue for sure.

Z eliminator · 11-05-2012, 06:03 PM

mine did the same thing it sounded like a hammer hitting the back right side of the intake cover.
It was a cracked flex plate.
this happens when the torque converter comes loose.
the wheel is full of spider cracks .
mine was junk.
got lucly and they replaced it under warrenty.
go back to the guy who installed your engine and ahve him inspect your flex plate,
remove the bolt cover where the torque converter is ..

Z

weiboy718 · 11-05-2012, 06:07 PM

Yikes!

Now it is that time for you to take out your note that you had your dealer wrote saying they'll cover your warranty even with the supercharger.

Good luck!

Z eliminator · 11-05-2012, 06:38 PM

who removed the engine for a rebuild ?

elperuano · 11-05-2012, 06:55 PM

Quote:

Originally Posted by elperuano

Doesn't it lean more towards knock if it gets louder while under load or driving? But knock u should be able to hear from the top correct?

Yea that's what I said earlier. Good luck OP.

ANMVQ · 11-05-2012, 07:08 PM

Quote:

Originally Posted by Z eliminator

who removed the engine for a rebuild ?

No one ? Motor and trans have never been out of the car.
Weiboy that paper is on my table and it is the Infiniti system. when I went to get the TB. codes fixed they told me it was in my history notes. So we'll see .

elperuano · 11-05-2012, 07:15 PM

Quote:

Originally Posted by ANMVQ

No one ? Motor and trans have never been out of the car.
Weiboy that paper is on my table and it is the Infiniti system. when I went to get the TB. codes fixed they told me it was in my history notes. So we'll see .

Even more reason to lean towards knock if the motor was never touched. Could be from trying to make it all work and probably the countless dyno runs trying to tune that lead to this. Hope for t

11-05-2012, 05:28 PM	#23 (permalink)
ANMVQ A True Z Fanatic Join Date: Mar 2011 Location: Framingham MA Posts: 2,732 Drives: 2014 Q50 AWD Rep Power: 19	Hey no one has had part of the top of the motor apart . if the valves where ticking I would hear it on top also. top of the motor is no noise at all just on the bottom. __________________ 14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

11-05-2012, 05:42 PM	#24 (permalink)
Boosted Performance The370Z.com Sponsor Join Date: Feb 2010 Location: Edmonton, AB Posts: 1,629 Drives: Z's Rep Power: 3382	To me that sounds like rod/bearing knock. I had an engine tha spun a bearing due to oil starvation (not a VQ) and it sounded just like that. It is a mechanical issue for sure. __________________ 750WHP starting @ $7,500 to the door FOR DETAILS VISIT: http://www.the370z.com/members/boosted-performance.html FB: https://www.facebook.com/Boosted-Per...6303179791462/ IG @boostedperformanceyeg

11-05-2012, 06:03 PM	#25 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	mine did the same thing it sounded like a hammer hitting the back right side of the intake cover. It was a cracked flex plate. this happens when the torque converter comes loose. the wheel is full of spider cracks . mine was junk. got lucly and they replaced it under warrenty. go back to the guy who installed your engine and ahve him inspect your flex plate, remove the bolt cover where the torque converter is .. Z __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

11-05-2012, 06:38 PM	#27 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	who removed the engine for a rebuild ? __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

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11-05-2012, 03:41 PM	#17 (permalink)
elperuano A True Z Fanatic Join Date: Oct 2011 Location: Southwest FL Posts: 1,374 Drives: G37S Rep Power: 29	Doesn't it lean more towards knock if it gets louder while under load or driving? But knock u should be able to hear from the top correct?

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11-05-2012, 06:07 PM	#26 (permalink)
weiboy718 Track Member Join Date: May 2010 Location: Bay Area Posts: 923 Drives: Infiniti G37 Rep Power: 16	Yikes! Now it is that time for you to take out your note that you had your dealer wrote saying they'll cover your warranty even with the supercharger. Good luck!