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Rb26 Nasty Knocking

GTRSOL

By GTRSOL,
in Engines & Forced Induction

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GTRSOL Apprentice

GTRSOL

Posted
Posted

Hi guys,

Last night i went out for a run in the 32gtr Launched in first. then boosted up to 180,

as soon as i let off a loud ticking/pinging sound was coming out from the engine,

I turned it off at a mates and let it cool down, started back up but only made the sound when free reving above 3000 RPM

Took off to take it home and under load it wouldnt make the sound or backing off, only when in between load and off load if that makes sense (cruising), by the time i got home the ticking/knocking had worsened and was doing it at idle.

any ideas? i'h hoping its not a big end as it sound like is coming from the top? (car still drives/boosts and revs fine.

Regards Jimmi

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SargeRX8 Grand Master

SargeRX8

Posted
Posted

It could be anything. I'm going to say noisy lifters. If you had a big end spun, you would know. It would sound more like a hammer on your block. If its a light tap, knocking sound, its probably head related. I'd put some new oil in it and see what it does. If the problem gets worse, louder, constant etc it may well and truly be a big end or some other thing at the bottom.

Dajae Community Regular

Dajae

Posted
Posted

I experienced the exact same sound about 4 weeks ago. Turns out i spun no.5 bearing. Fairly similar situation too, mine was caused by oil starvation.. Not good.

Hopefully you have better luck than i did. Take it to a mechanic, or get one to come to you..

Best of luck mate.

GTR_JOEY Grand Master

GTR_JOEY

Posted
Posted

id say the luanch then full throttle all the way to 180 is pretty much a give away that the cause of the problem was oil starvation

What i wanna know is

-what power are u running?

-what engine mods do u have and do u run a baffle or modified sump?

-do you overfill your sump?

GTRSOL Apprentice

GTRSOL

Posted
  • Author
Posted (edited)

Hi guys,

Car is a Late 1993,

Power FC

Twin Nismo t28's

Tune

Standard Injectors,

Running 17psi At the time

Standard Sump not overfilled.

Air Temp at the time roughly 18-20 C

Roughly 355rwhp

Oh and 72,000kms,

Edited by GTRSOL
GTR_JOEY Grand Master

GTR_JOEY

Posted
Posted

Did i say that the head flooded with oil?

how would the head flood with oil if the oil pick up isnt picking any up

If you are pulling hard G's for an exteneded period of time, which is entirly possible in a GTR that performs a hard launch then is full throttle all the way to 180kms, then you can starve the engine of oil as the oil is not near the pick up...

insane?.. i think not

SargeRX8 Grand Master

SargeRX8

Posted
Posted (edited)

Did i say that the head flooded with oil?

how would the head flood with oil if the oil pick up isnt picking any up

If you are pulling hard G's for an exteneded period of time, which is entirly possible in a GTR that performs a hard launch then is full throttle all the way to 180kms, then you can starve the engine of oil as the oil is not near the pick up...

insane?.. i think not

I wasn't going against what you said, I just assumed you were probably implying that any useable oil would have been flooded into the head! Ive read that it doesn't take very long at all on some high rpm to fill the head up with pretty much all useable oil in the sump.

Pulling enough G's and maintaining that in a straight line to starve the engine of oil.... that is crazy shit insane! Its amazing to see these oil control issues evident in skylines. They are all very possible situations and you would think Nissan would have thought of ways to prevent this stuff from happening.

Also those KM readings, 72000km.......................................................................................................................... nah.

Is it a bad thing to overfill your sump? It takes me some good time to fill up my car and get it exactly on the right mark on the dip stick. I over filled it once and I let some oil out because I read it can do bad things but I didn't see how or why...

Edited by SargeRX8
MrStabby Grand Master

MrStabby

Posted
Posted

Did i say that the head flooded with oil?

how would the head flood with oil if the oil pick up isnt picking any up

If you are pulling hard G's for an exteneded period of time, which is entirly possible in a GTR that performs a hard launch then is full throttle all the way to 180kms, then you can starve the engine of oil as the oil is not near the pick up...

insane?.. i think not

So, if the oil is not in the sump, where is it?

How the could the head flood with oil? I would have though it was obvious that this would happen before the sump is empty.

MrStabby Grand Master

MrStabby

Posted
Posted

sorry to hear mate

so is it a good idea to overfill 26's with oil??

Yes. For track work, many fill the the bottom of the top bump on the dipstick. So about a cm above the full of the hatched area.

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