[BernardoEsteves]

Hi everyone,

I have a Porsche 911 with a freshly built 2.7 engine.

Specs:

2.7L engine, 9.8:1 compression ratio

2.4S original cams

Ø90mm Mahle pistons

Intake valve: Ø47mm

Exhaust valve: Ø40mm

Intake port: Ø37mm

Exhaust port: Ø35mm

Intake valve lift: 10.5mm

MFI system (no solenoid/cold start)

Cold iridium spark plugs

Fully rebuilt from scratch — 0 hours on it

The engine started fine for the first time. Oil pressure isn’t perfect, but I’m getting around 1.5 bar at idle and 5.5 bar under load when warm, which seems acceptable.I think it's importante to mention that the engine was rebuilt in 2019, and was sitted in a dry place for 6 years until now

Now the issue:
When accelerating (around 2000 rpm and above), I can hear a tickling noise coming from the left bank. There’s also a bit of bluish smoke from that side, but not too much.

I checked:

Compression: all six cylinders are OK
Valve clearances (left side only intake): 0.1 mm
Spark plugs: all dry except cylinder #3, which shows a bit of oil
Also check with camera and cylinder looked OK as far as I could see

Any ideas what could be causing this? What would you check next?

Thanks in advance for any insight!