Jump to content
SAU Community

RB26 loud valvetrain - Vid inside.

No Crust Racing
 Share

Recommended Posts

No Crust Racing Grand Master

No Crust Racing

Posted
Posted

RB26 loud valvetrain - Vid inside.

Picked car up from tuner, now has BC springs and Kelford L182A cams. Valve train is noticeably noisier, can be heard in cabin. 

Tuner states he checked all clearances and "A few thou looser than before, but all within standard spec". He said he doesn't mind the clearances to be a little looser as a loose tappet is a happy tappet or something like that. 

I can have it reshimmed, but of course more time/money. 

Pros and cons of loose/tight clearances? 
 


 

Link to comment
https://www.sau.com.au/forums/topic/470530-rb26-loud-valvetrain-vid-inside/
Share on other sites
GTSBoy Grand Master

GTSBoy

Posted
Posted

OK, so the noise is certainly from that extra clearance.  It is not better to set the clearances inside the "standard spec" when the cam manufacturer specifies that they should run at tighter clearance.  When the ramps start getting more aggressive the clearances need to tighten up to stop the lobes from slapping onto the lifter.

If you keep a really good oil in it and change it frequently it will probably be fine.....but I'm not enough of an expert to trust me.

Huzqld Enthusiast

Huzqld

Posted
Posted

Had this same noise from my neo when i fitted some 270, 9.2mm cams. Had all clearances set to what the cam specs said... After having them in and out numerous times, they sent me a new set with a less aggressive ramp and the noise went away.

Not saying that's your problem, just a similar situation 

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

    • MBS206
      Ticking Sound On Idle - Rb25

      By MBS206 · Posted

      Have you put an aftermarket oil pressure gauge on and verified your oil pressure?   Noise being on the block, on exhaust side, how high up the block does it seem to be? It could be the VCT system getting cranky, especially if it's mainly at idle, and when warm, as that'll be your lowest point for oil pressure. Could be showing that oil passages / VCT solenoid are blocking.
    • WARLORD
      injectors top feed for sale

      By WARLORD · Posted

      Deatschwerks 1800cc sold
    • GTSBoy
      Ticking Sound On Idle - Rb25

      By GTSBoy · Posted

      Well, hydraulic lifters will get noisy if they are dirty/fouled in some way, and exactly how that manifests will depend on exactly what schmutz is where. There is a procedure on here somewhere for dismantling and soaking/cleaning them. Replacing them with new is about 50% of the work and about 5% of the money!
    • myrbgivesmeheadaches
      Ticking Sound On Idle - Rb25

      By myrbgivesmeheadaches · Posted

      Thanks for the reply @GTSBoy this is is a hydraulic lifter engine. Yea right i did not realise the lifters were supposed to be compressible while installed. I could push them down but i had to lean almost my while body weight on them.  I have never heard of a lifter/ lifters ticking only at hot idle and getting worse the hotter it gets. I have owned a few jdm cars with noisy lifters. This noise is slightly more subtle, it is more of a sharp gentle metalic tic than the solid and more loud tapping I've heard on lifters. I have used a metal rod, alloy tube, hose and stethoscope and could not find the source of the tick. But it appears to be loudest on the actual engine block behind the exhaust cam gear and next to the oil filter. I had mate (40 year old mechanic) go over it with me and he couldn't find it either..  Could it be a cam seal issue of some sort?  Cheers  
    • GTSBoy
      Ticking Sound On Idle - Rb25

      By GTSBoy · Posted

      This seems problematic and unlikely at the same time. Vanilla RB2Xs have hydraulic lifters. They do have "zero" clearance, but only when running with oil pressure inside them. When not running, you should be able to compress them and obtain heaps of clearance. RB26s and Neos have solid lifters. They should have ~0.3mm and ~0.5mm on the inlet and exhaust respectively. If they have zero clearance then bad things are happening. With nothing else being wrong, it would mean that the valves would be held slightly (ever so slightly) open when they are supposed to be closed and it should have all sorts of problems when running, caused by leakage in/out through the valves. Or, zero clearance can indicate severe valve seat recession. None of it is good. Have you used a piece of hose as a stethoscope to try to localise the noise?  
×
×
  • Create New...