Odd knocking noise under initial load - ZR-1 Net Registry Forums

Don in VT · 10-30-2010

Hi,

Now that I have the exhaust calmed down a bit with the addition of the X pipe I have a new noise to track down the cause of. When I start the car the cam chains make their 1 to 2 second rattle. When I press on the gas a noise appears that almost sounds like the older diesel motors. It is a mild knock. It only is there under initial load and is gone by 800 to 1000 rpm. Above 1K rpm the motor is smooth and quiet. I am sure that this motor has been run hard but it does not smoke or make any unusual noises above 1K rpm. Could the knock be rods, mains, wrist pins ? I did do the search .

Any ideas

Don

10-30-2010	#1
Don in VT Join Date: Jul 2010 Location: Fairfax, VT Posts: 203	Odd knocking noise under initial load Hi, Now that I have the exhaust calmed down a bit with the addition of the X pipe I have a new noise to track down the cause of. When I start the car the cam chains make their 1 to 2 second rattle. When I press on the gas a noise appears that almost sounds like the older diesel motors. It is a mild knock. It only is there under initial load and is gone by 800 to 1000 rpm. Above 1K rpm the motor is smooth and quiet. I am sure that this motor has been run hard but it does not smoke or make any unusual noises above 1K rpm. Could the knock be rods, mains, wrist pins ? I did do the search . Any ideas Don