Noisey Rb20 Det Head

[rotort]

Can any one help

I have a noisey head on my RB20DET, my self and many other have diagnosed it as noisey lifters clattering, I tried many different additives to try and quieten it down, with no luck, ive tried super thin oils, thick oils, I have changed all the inlet cam lifters (as its that side that was noisy)(comes from just behind the throttle body, so cylinder 4-5 or 6) and it just doesnt go away.

It only makes the noise at idel and off the throttle, under power it only doesnt it at low revs. I am at a loss and just dont know what it is. I thought it must be a big end bearing, causing piston slap, or something more terminal, but i have been chasing the noise for over a year and the engine still goes strong, it has lasted multiple drift days etc. So it cant be to fatal, it just gets noisier. The engine isnt far off standard, just the usual, zorst filter, FMIC, boost, Oil cooler.

I currently have Mobil 1 in the engine, going to try some thick stuff again, but I just dont know what next

Any ideas Guys

thank you.

martin

[blind_elk]

...piston slap,...

That was going to be my guess.

[rotort]

thats what i thought but surely it wouldnt have kept on going for over a year, a hard year at that if it was a bearing causing it.

[dose_it]

injectors??

[rotort]

could it be an injector? making such a loud noise? it is really loud!

[rotort]

would any one know if the water control solenoid thing under the throttle body could be sticking or causing the noise?

[raZ1911]

Lifters?

[rotort]

did you read the first post, it all about the lifters being changed and the noise didnt!

[lachlanw]

put the tip of a long screw driver on the injectors and your ear close to the other end . ( or a shortish straight ish piece of garden hose ) should be pretty easy to find the noise . and i have a mate with noisey rb20det injectors . its not a loud tapping noise like lifters but it is more of a loud tick noise

[rotort]

definitely not injectors, i have run the engine with each injector unplugged, all this did was made the noise even louder as the engine went off balance due to miss firing on 5 cylinders. so it is definitely not an injector, it is definitely mechanical noise rearward of the throttle body.