Jump to content
SAU Community

RB26 very noisey up top....


Recommended Posts

A mate of mine was playing with his newly fitted HKS adjustable cam gears on an otherwise stock R32 GTR (90mm HKS exhaust, filters & boost restricter removal is the limit of the modifications) and after making some very mild (suggested) adjustments and restarting the engine a VERY loud top end "clatter" appeared.

The settings he was aiming for was :

INLET : 2 deg advanced

EXHAUST : 4 deg retarded

BUT he went the wrong way on both cams and ended up with

INLET : 2 deg retarded

EXHAUST : 4 deg advanced

Once the engine was restarted the idle was very rough, the aforementioned noise appeared and the was significantly less vacuum present on the boost gauge.

This is where my involvement began

Pulled the covers off again and I pointed out the cams were set in the wrong positions. We reset them to where they should have gone in the first place :

INLET : 2 deg advanced

EXHAUST : 4 deg retarded

Idle still poor, noise unchanged and vacuum the same.

We then reverted the cams back to standard position (0 deg IN, 0 deg EX) and while the idle improved it's still rough the vacuum and noise stayed the same.

Each time the ignition timing was reset appropriately.

Given the lower level of vacuum we suspected 1 or more dropped inlet valves so checked each cylinder by removing the injector plugs one by one and found that the engine revs dropped when every one of the plugs was removed and picked up again when each plug was replaced, so that would APPEAR to rule out inlet valves.

The rocker cover will come off tomorrow for a better look but until then does anyone have any other suggestions to mull over? Exhaust valves?? Camshaft??? Other????

Also is the RB26 a "non-interferance" engine?

Link to comment
https://www.sau.com.au/forums/topic/5007-rb26-very-noisey-up-top/
Share on other sites

  • 8 months later...

Yes, the RB 26 is a non-interference engine, in stock form.

Did you make sure to put the spacer washer between the engine and the crank angle sensor back on...? This is a common overlook if you want to expose your new cam gears and decide not to put the cover back on. If you slide the CAS without the spacer washer, it will chew the rear of the CAS out and make the noise you are describing.

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


  • Similar Content

  • Latest Posts

    • When you pulled it off, there is no signs of blown head gasket? Is it possible you have some other issues going on? Possible cracked blocked? Or do you think it's straight up lifting the head? Did you check what the head was torqued to before pulling it down (To see if possibly they're stretching, or starting to break threads out etc)?
    • Seems like a decent result for a modded JZX110. They are bulky in comparison to the 100 and 90 models (which I'd prefer myself) but they are getting very few and far between here in JP these days. Thanks for the detailed review and the import process into the UK. I also have a car which I'm hoping to export from Japan at some stage so it's good to know if someone from the UK was interested in it. By the way the corrosion underneath is par for the course for cars which were located in/near the mountains or along the Japan sea coastline. They get huge amounts of snow every winter and the sodium chloride is used on the roads. Many cars have some kind of rubber like treatment underneath but they tend to limit it to the wheel arches underbody and fuel tank. Suspension arms and sub-frames will have similar corrosion to your JZX110 which is a common sight. See it all the time and car dealers here generally don't even mention it unless asked.
    • If the sound goes away when you clutch in, the 1.5/2 way diffs are just shit, and you are a normal person. The diff is likely "fine" but driving at anything under 30kmh is a violent horrible experience. It would be exaggerated with solid diff bushings and subframe bushings if you have those.
    • Trailer got new mudguards to accommodate the new wheels Lightweight ally Painted, stickered and done ✅ 👌  
×
×
  • Create New...