high oil consumption, oil leaks across the piston rings Options

[HLANG]

I just recently did a complete 2L engine overhaul and installed forged JE-Pistons with Biral Cylinder Liner kit 96 mm bore. The compression is fine, the engine runs well but I experience a consumption of 1 liter oil per 1.000 Km. After I checked the combustion chamber I found too much oil deposits on the spark plugs and the pistons. The ring gap of the piston rings is in tolerance so I wonder why there still passes so much oil from the crankcase into the combustion chamber.

[Superhawk996]

Without knowing details of how you broke the engine in, the mileage on it, and/or whether you are running a functional thermostat and cooling flaps it’s hard to say what’s going on. Likewise you don’t mention if valve guides were replaced and properly reamed. Not uncommon to have oil pulling past worn out or improperly sized valve guides.

Whether or not you are running fuel injection or carbs (and their tuning) also plays a part in whether or not the cylinder walls are washed down leading to crazy ring wear or failure to seat the rings.

However that isn’t excessive oil consumption by the factory manual. Yes it’s more than a modern engine but it isn’t excessive. It’s more than I would want to see on a fresh rebuild. However, if your mileage is low and the rings haven’t seated fully, it will probably decrease with more mileage as the rings seat.

Could also be related to PCV pullover depending on your intake setup.

So basically too many variables.

I’d start with a leak down test to see how well the rings are seated.