986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Engine noise diagnose assistance - Possible vario cam actuator/pad/chain issue?

blue62 · 05-12-2021, 04:46 PM

If you are attempting to isolate a sound.
Use an automotive stethoscope, or a length of hose.
Hold one end of the hose to your ear then move the other end of the hose around the engine to locate the sound.
Ok I know access can be difficult.
Also if it only happens at certain RPM's then you need a helper.
But it is actually very effective.
If the sound is Vario Cam chain,pad related you should be able to isolate the sound to which bank it is without to much trouble.

Looking at your Cam angles it is showing a 25 Degree change at change over.
25 Degree change in Cam angle when the VarioCam actuator triggers is spot on.
I forget what RPM that is supposed to happen but somewhere around 1500 RPM is when they kick in. Then back out at around 5500 RPM.

05-12-2021, 04:46 PM	#15
blue62 Registered User Join Date: Aug 2018 Location: Woodland Wa Posts: 1,300	If you are attempting to isolate a sound. Use an automotive stethoscope, or a length of hose. Hold one end of the hose to your ear then move the other end of the hose around the engine to locate the sound. Ok I know access can be difficult. Also if it only happens at certain RPM's then you need a helper. But it is actually very effective. If the sound is Vario Cam chain,pad related you should be able to isolate the sound to which bank it is without to much trouble. Looking at your Cam angles it is showing a 25 Degree change at change over. 25 Degree change in Cam angle when the VarioCam actuator triggers is spot on. I forget what RPM that is supposed to happen but somewhere around 1500 RPM is when they kick in. Then back out at around 5500 RPM. Last edited by blue62; 05-12-2021 at 04:52 PM.