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.

[Dose Pipe Sutututu]

Apologies, should have been a bit more descriptive 

[Toff]

11 hours ago, GTSBoy said:

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.

Yeah that's exactly my thoughts but I'm far from an expert. Video didn't upload so will get it on YouTube and share the link. Thanks mate.

10 hours ago, Dose Pipe Sutututu said:

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.

Yeah as above really they're not horrible numbers are they! 

And it's on a greddy inlet. Has ID1050x that are quite noisy but tbh it did this on the older injectors. Lots of noise comes from the injector rail too.

[Dose Pipe Sutututu]

Maybe record a video and post it up on YouTube and link it back here 

[Toff]

1 hour ago, Dose Pipe Sutututu said:

Maybe record a video and post it up on YouTube and link it back here 

https://youtu.be/CCHaKUhZi34?si=PNdluupk9TWFtvws

[Dose Pipe Sutututu]

56 minutes ago, Toff said:

https://youtu.be/CCHaKUhZi34?si=PNdluupk9TWFtvws

Thanks for that, it actually sounds fine to me.

What oil weight are you running and what kind of oil pressure do you see around idle RPM and a bit over it?

[GTSBoy]

I'm going to vote for considering going to the effort to close the lash down to the minimum. My bro-in-law got around to checking the clearances on the 3SGE in his Caldina. Was a bit fat all over. New shims at lowest allowable lash, and the car is remarkably better to drive. It appears that the increase in both total lift and duration that you get from doing this is worth a lot more than you might expect.

I have been having evil (and expensive and time consuming) thoughts about doing it to mine, and I don't even think I have a problem. Not that I'd know, though.

[Toff]

On 10/26/2024 at 1:01 PM, Dose Pipe Sutututu said:

Thanks for that, it actually sounds fine to me.

What oil weight are you running and what kind of oil pressure do you see around idle RPM and a bit over it?

Yeah most people that have heard it said it was fine but it's always had me slightly worried.

Oil pressure I can't remember off the top of my head but it has plenty, I run 10w60

On 10/26/2024 at 1:04 PM, GTSBoy said:

I'm going to vote for considering going to the effort to close the lash down to the minimum. My bro-in-law got around to checking the clearances on the 3SGE in his Caldina. Was a bit fat all over. New shims at lowest allowable lash, and the car is remarkably better to drive. It appears that the increase in both total lift and duration that you get from doing this is worth a lot more than you might expect.

I have been having evil (and expensive and time consuming) thoughts about doing it to mine, and I don't even think I have a problem. Not that I'd know, though.

You're probably right mate, best get ordering some shims!

Guessing Nissan is the best place for them?

[GTSBoy]

7 hours ago, Toff said:

Guessing Nissan is the best place for them?

I dunno. Maybe. There's a crowd here in Oz called Precision Shims that I'd probably look to first. Although NIssan might be surprisingly cheap enough.

Trouble with the process is you have to take all the existing shims out to measure them to know what you need to order.