Jump to content
SAU Community

Knocking From Gtr Engine

Dr GTR

By Dr GTR,
in Engines & Forced Induction

 Share

Recommended Posts

Dr GTR Rookie

Dr GTR

Posted
Posted (edited)

Hi Guys,

I know its my forst post but i need some help.

I am hearing bit of a knocking noise coming from the top of my R33 GTR engine (turbo side) a few seconds after it starts. The noise kinda increases with revs but disappears after 3k rpm but returns when i let go of the gas. The knocking does go when oil get slightly warm after 3 or 4 minutes. I have also taken the oil cap off when the engine is on and i can hear a clicking/tapping kind of noise. The noise has got a bit louder over time but i am hoping its the clearances or lifters and nothing more than that.

Anyone have any suggestion or further dignostic help???

Gerry

Edited by Dr GTR
Link to comment
https://www.sau.com.au/forums/topic/166248-knocking-from-gtr-engine/
Share on other sites
RICK-GTR Collaborator

RICK-GTR

Posted
Posted
Hi Guys,

I know its my forst post but i need some help.

I am hearing bit of a knocking noise coming from the top of my R33 GTR engine (turbo side) a few seconds after it starts. The noise kinda increases with revs but disappears after 3k rpm but returns when i let go of the gas. The knocking does go when oil get slightly warm after 3 or 4 minutes. I have also taken the oil cap off when the engine is on and i can hear a clicking/tapping kind of noise. The noise has got a bit louder over time but i am hoping its the clearances or lifters and nothing more than that.

Anyone have any suggestion or further dignostic help???

Gerry

are u sure the noise is comming from the top of the engine? not the middle or bottum?

I thought when my gtr was knocking it was coming from the top but it was actually bottum end bearing

pssiii Collaborator

pssiii

Posted
Posted

Bent valve(s)!!

This happened to a customers GTR, previous owners tried to chase power with boost, leaned out which caused melting of plugs and broken ring-lands. The melting of the plugs caused material to get caught under both exhaust valves at no.6, something else could have gone through engine also?

If the valves dont seat then they have too much clearance and knock at top of engine.

G'luk

Dr GTR Rookie

Dr GTR

Posted
  • Author
Posted (edited)

Thanks for your response guys....The bearings were only done about 3 months ago due to a dodgy filter so i am hoping that they havent gone again. When they did go the noise was not like this and the mechanic seems to think that the noise is my clearances thet need sorting. This time its kind of coming from the top and definately towards the middle of the exahust side cam but as i said the noise does go away after a few minutes.

Gerry

Edited by Dr GTR
Dr GTR Rookie

Dr GTR

Posted
  • Author
Posted
whats the oil presure like? hot/cold? ive never ever heard a big end knock disapear with heat. maybe a dodgy lifter

The oil pressure is great due to the trust oil pump. Im seeing 7bar when the car is stone cold and just over 2 bar on idle when the oil reaches 80 degrees. Pressure whilst driving is also very good. I also have trust sump extension.

Gerry

Dr GTR Rookie

Dr GTR

Posted
  • Author
Posted (edited)

Here is a sound clip io managed to get today when i started her.

Full spec of the car is as follows just in case it could be one of the mods

Apex V-max SPL pistons with cooling channles

Trust rods

R34 crank balanced

Nismo 24 U Block

Apexi 280degree cams with 10.5mm lift

Apexi double springs

Trust greddy Intake plenum

Greddy t517z trubos

Trust oil pump

As i mentioned, this noise does go after the oil starts warming up and there is no loss in performance thats for sure lol

CIMG0895.WAV

Edited by Dr GTR
Dr GTR Rookie

Dr GTR

Posted
  • Author
Posted (edited)
Geez man - I wouldn't be running the engine - take it to a workshop !

Fingers crossed its nothing major man........My tuner is coming over in the morning to have a listen to it. If it was the bearings wouldnt the noise be permanent???

Gez

Edited by Dr GTR

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      Torana Lx Gtr Hatch, Lots Of Pictures

      By The Bogan · Posted

      LOL, when one "money pit" is never enough Noice, and excellent work mate
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I have more than enough digging, laying blocks, moving gravel, airrating, feeding and top soiling the grass, and setting up the veggie gardens growing some seedlings,  and then removing all the unused rock to keep me busy for the next few months at least,  hopefully the rain stops soon so I can get a few hours in this arvo, but, before that Sunday is washing day, is every body happy, you bet your life we are Nice country road day drives are a day off whenever I'm muscle sore from all the landscaping at the moment, but, more epic multiple day drives will start once the majority of the big jobs outside are completed
    • MBS206
      NC MX5

      By MBS206 · Posted

      I hear that would involve some nice country road drives into the hills for Mark...
    • MBS206
      Recommendation for engine oil funnel spill free

      By MBS206 · Posted

      I thought I'd come back and add something I JUST learned. A Toyota LandCruiser with a 1HZ, mates perfectly with a bottle of Nulon brake fluid. As in, it perfectly screws in. Great make shift funnel when you cut the bottom of it off. This may work for your Corolla.   Unfortunately, tipping a 10L drum is much harder than a 4 to 6L bottle, and they no longer include the easy pour tap which was just perfection to use previously.  
    • EndZee
      Fuel Pump Control Module & Dropping Resistor

      By EndZee · Posted

      Guys since i bought r33 gts25t coupe 1994 automatic a/t(manual swap 350z gearbox)  all i got is problems, always problems. Lets start with that when i turn key into ignition(ON) fuel pump doesnt always works. Sometimes i have to turn key twice Off/on/off/on until it primes. Its new, dw300 - 340lph. My gearbox broke so i did gearbox swap, install different intake manifold, injectors and i take pipes. Car was sitting in garage for more than half a year. I did assembly all not that long ago and when i turn ignition cant hear prime. All of sudden it stopped working. Theres many videos on YouTube how to make relay mod on r33 straight from battery so i did and it doesnt work! 😰 30 - battery positive  87 - positive from fuel pump to relay 85, 86 - one of two wires from original fuel pump wires(light blue, grey) and it didn’t work. so I check on ignition and took original BLUE relays wires from trunk, next to fuses. (I believe it’s IGN+ and ECU pin 18. it didn’t work…  tried connecting (IGN+ from og relay) and (ECU 104 from 1of4 FPCM wires) to my new relay 85/86 and it didn’t work.  I unplug FPCM. Didn’t work. im thinking what’s wrong   fuel pump is working, if I leave IGN+ on 85 and 86 straight to ground it works but it’s just nonstop. Since it getting constant 12v after key in ON. light blue wire gives me 6-8v.  so how this should be connected? What causing ECU not giving — on pin? Or I did sth wrong and that’s why it doesn’t work? I need negative signal on ECU that control fuel pump. What this should be?
×
×
  • Create New...