Cold start rattle on LS3 - piston slap :) Engine replaced

[07GTS]

To those engineering types out there. Would the higher cylinder pressures with a supercharger add to the slap ?

having more gap will be better for a blower engine as it gives the piston more room to expand from the heat, thus the added airflow from the blower even when not in boost adds torque so will lessen the slap, boost fixes many issues...

 

[Skylarking]

boost fixes many issues...

Can breaks a few things too

 

[lmoengnr]

If you want to know the very definition of 'piston slap', stand next to a Pratt & Whitney 1830 radial engine during a start up after an overnight cold soak during the middle of winter in Hobart...
The rattle is louder than the open exhausts.
They have full skirt pistons with a second set of oil control rings at the bottom of the skirt....

 

[VFSV6FORME]

To those engineering types out there. Would the higher cylinder pressures with a supercharger add to the slap ?

I say no because some LS3 slap at idle and if they slap more the oil rings will be effected. When I had the 2002 CV8 Monaro the dealers replaced the Engine at 5000K because it was slpppinh it head off even warm/hot then the Dealers replace that replacement engine 1000k later and that new engive was just as bad as the first, second engine so when I cam back with a car that sound like a diesel they took that engine out and waited for a special team that was going around Holden Dealers and my engine was rebuilt using a set of pistons that had a longer skirt and even then that match pistons to the bore (numbers them) Yes I was there (PS to keep me happy, allowed me in the Workshop) to see how they matched them then I left. After this the Car was perfect!!!!!!!! These guys were good, Not even a scratch or dint on the car.

 

[Ron Burgundy]

Never posted items for engine replacement

https://imgur.com/a/i7ukSSd

 

[Ron Burgundy]

This is what comes up under that engine part number although my coils and leads looked new too

https://imgur.com/a/AkkLYup

 

[VCoz]

Mines going in next week to stay at the dealership for a couple of days to determine if its of any concern. As a bonus, one of my injectors failed today. Anyone want a SSV redline with 26K on the clock?

Hi Paulie81 - MY16 build around same period as my My16 - injector problems also (injectors are a simple low cost fix) ... How supportive was your dealership and GM Holden re the piston slap rhetoric. Hope your outcome re your LS3 engine noise was good - if fixed was lifter damage and cam damage identified? My battle is just beginning.

 

[vxbris]

Lifter tick, pison slap or normal vale train noise?

Sounds like mine, I too was wondering if this was “normal”.

 

[Ron Burgundy]

Sounds like mine, I too was wondering if this was “normal”.

Yep...singing like a bird !!!

 

[IBLOWN]

Do you still have the videos available?