Neo Noisy Cams

[kls83]

I just got kelford 272 vct cams with new valve springs plus reco head the cams have been shimmed And have that rattling noise like urs.

[Toff]

Thread revival, apologies!

I have a similar issue, strange noise that appears shortly after starting the car, fluctuates a bit with RPM... If you bring the revs up the noise sort of follows / trails behind and then settles if that makes sense?

Engine was built years ago with CAMTECH 268 Cams (9mm lift i believe) and the rest of the upgrade kit with the springs and retainers.

Can you upgrade the pulley itself, if the spring is too weak (same as on the VG30 Lumps) or is it pointing towards another issue?

 

Cheers!

[Dose Pipe Sutututu]

@Toff if it's a NEO and it's making the noises you're describing, it sounds like you need to work on the valve clearances and measure/replace shims as required.

[Toff]

Hi Bud, Yeah that's the next step, going to get these checked. they were set "bang on" when it was built and its always been present. They may well be wrong though!

[Dose Pipe Sutututu]

Another thought, are those actually NEO cams made for the NEO head (shim over bucket) and not the non NEO head (hydraulic lifters)?

[Toff]

1 hour ago, Dose Pipe Sutututu said:

Another thought, are those actually NEO cams made for the NEO head (shim over bucket) and not the non NEO head (hydraulic lifters)?

They were definitely the correct NEO Cams bud

[Dose Pipe Sutututu]

36 minutes ago, Toff said:

They were definitely the correct NEO Cams bud

Time to get measuring (not a fun job)

[Toff]

5 minutes ago, Dose Pipe Sutututu said:

Time to get measuring (not a fun job)

Yeah going to have a crack at is this week... Great

[Toff]

Got them measured (better late than never) 

They seem to be the "wrong way around" IE Tighter on inlet and slacker on exhaust which I believe is actually the opposite to the norm on an RB? They're not perfect but am I right in saying they're not horrendous? I can't find the specs to suit the exact camtech cams anymore so using OEM and Other aftermarket specs they don't seem bad?

Put a video on to show. Using a stethoscope the noise doesn't seem to be focused around one area.

 

Worth noting the car has probably done 6000miles like this and it's never ever changed nor struggled to make power etc.

I'm a bit stumped!

 

[GTSBoy]

Doesn't seem like it should cause them to be too noisy. Circa 0.4 is on the wider end of the range though. You can probably target more like 0.3 on the inlets.

[Dose Pipe Sutututu]

Those numbers aren't terrible.

Another question, do you have an aluminium plenum? You could just be hearing the solid head a bit more because of that.

I know when I went from the stock intake manifold to an aftermarket intake manifold/plenum, everything became louder.

Injectors, lifters, became more audible.

[GTSBoy]

23 minutes ago, Dose Pipe Sutututu said:

aluminium plenum

Perhaps more the word "sheet metal" rather than aluminium. Because, you know, the stock one is cast ali.