went for a little spin in my z this morning windows down noticed like a cam belt rattle kinda noise but i dont think its that cos i had it changed 3000 miles ago, noise only happens between 1100 rpm @ 1500 rpm from cold start, 10 mins after warm up and no noise at all or have i had the nosie and never heard it before :(

 

I have had a cam belt snap on me before now so i dont RED LINE it all the time :)

 

cheers me Z m8s

Piston Slap anyone? Sounds like it, but dont take my word for it.

 

Piston Slap happens when the pistons are getting worn and become too small for the cylinders, as the pistons heat up they expand and fit the cylinders property, hence the noise disappears when warm.

Piston slap is not very common on a Z, only some upgraded engines with a well know make forged pistons may suffer from this.

Rattling sounds in the lower RPM's is usually caused by low oil pressure or crank bearings that are on their way out or (...which is a common problem, certainly if the owner doesn't take care of oil changes and/or forgets to check the oil level on a regular basis)

 

See if you can locate the sound.

If it's timing belt slap, it's most likely slapping against the top of the plastic covers...so it's pretty easy to locate.

If it appears to come from within or bottom of the engine and your oil pressure seems to be good, then the crank bearings are the main suspect

 

-Eric

Sounds a bit like lifters to me. Do a search on them - plenty of advise / checks on here.

Bang Bang Bang..................Big ends

Clack Clack Clack................Piston slap

Ticka Ticka Ticka................Lifters

Chitty Chitty Bang Bang........Fooked

:D

Bang Bang Bang..................Big ends

Clack Clack Clack................Piston slap

Ticka Ticka Ticka................Lifters

Chitty Chitty Bang Bang........Fooked

:D

 

 

ROFL.... Spot On Mate! Nice One! :slap: