Vs l67 rattle high rpm

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Vs l67 rattle high rpm

Postby Comcal76 » Wed Mar 14, 2018 10:05 am

Hi

I have a very loud rattle in the higher rpm range it starts at 3900 rpm and up coming from the engine bay, i'm not sure if it's tune related or mechanical i have included a xdl which shows alot of retard and some knock thanks in advance.
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$51 VS V6 Engine and Trans v1.10 WB 14.7kit (2).adx
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test10.xdl
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Re: Vs l67 rattle high rpm

Postby vlad01 » Wed Mar 14, 2018 10:32 am

could be anything including detonation. Without physically looking at the engine, we'd only be guessing.

Perhaps post up a video on youtube?
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Vs l67 rattle high rpm

Postby Comcal76 » Wed Mar 14, 2018 11:37 am

Thanks mate.

I ruled out the tune by putting the memcal into another vs l67 and had no rattle. Thanks

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Re: Vs l67 rattle high rpm

Postby L67PSI » Wed Mar 14, 2018 12:58 pm

Quick test is to remove blower belt. That can eliminate supercharger noise, especially the coupler as these flog out and can rattle / clunk.

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Re: Vs l67 rattle high rpm

Postby Comcal76 » Wed Mar 14, 2018 4:26 pm

L67PSI wrote:Quick test is to remove blower belt. That can eliminate supercharger noise, especially the coupler as these flog out and can rattle / clunk.


The rattle goes away with the blower belt removed, charger has new coupler, so I thought maybe the rotor pack so I swapped the charger over with another which had a new coupler also and it still rattled, have also replaced the tensioner to eliminate that.

Thanks

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Re: Vs l67 rattle high rpm

Postby vlad01 » Wed Mar 14, 2018 5:22 pm

Take a look at the harmonic balancer, it could be on its last legs and starting to come apart internally hence it could explain the noise when there is a load from the blower
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Vs l67 rattle high rpm

Postby Charlescrown » Wed Mar 14, 2018 5:28 pm

Think vlads on the money.

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Re: Vs l67 rattle high rpm

Postby Comcal76 » Wed Mar 14, 2018 9:22 pm

vlad01 wrote:Take a look at the harmonic balancer, it could be on its last legs and starting to come apart internally hence it could explain the noise when there is a load from the blower


Charlescrown wrote:Think vlads on the money.


When I replaced the timing chain I went over the balancer really good to check for any sign's of damage, could not even find a split or perishing in the rubber and I tapped with a rubber mallet for any rattles nothing. Thank you both for your idea's I know it's hard to diagnose without hear it.

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Re: Vs l67 rattle high rpm

Postby delcowizzid » Thu Mar 15, 2018 11:57 pm

Balance shaft bearing going maybe
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem

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Re: Vs l67 rattle high rpm

Postby Comcal76 » Fri Mar 16, 2018 7:43 am

delcowizzid wrote:Balance shaft bearing going maybe


Sorry mate I should have posted that I replaced the timing chain with a double row and deleted the balance shaft.

Mods.
86mm pulley reads 6 psi in lim, mace 1:98 rockers, pacemaker extractors, 2 1/2 catback, ported charger (rattled before porting).

Thing's replaced, catalytic converter, o2 sensor's, timing chain, belt tensoiner's, water pump, plug's, lead's, coil's, dfi, fuel pump genuine walbro 342 not eBay, fuel filter, 82 degree thermostat, transmission and converter.

Thing's borrowed too try, maf, fuel rail and injector's from a perfect running car, standard size supercharger pulley.

Sorry for not posting this before thanks.

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