[Jeka]

I have a k24 engine, I made it new bearings, new pistons, I put strong shocks and an original 87 mm piston, I installed all this on the car and when the car is hot, it starts to smoke and throw oil into my intake manifold and exhaust manifold, and also on the plugs themselves, and there are misfiring Because the oil is on the plugs. The pvc system is not connected. The pvc system is also not connected in the intake manifold. And there is still oil on the valves and there is oil. But the strangest thing is that it doesn't smoke for me at high rpm. Only when standing still. New valve rubbers. Any idea what to do, is there such a thing as a crack in the engine head?

 

[LotusElise]

Welcome to K20a.org @Jeka.

I have a k24 engine, I made it new bearings, new pistons, I put strong shocks and an original 87 mm piston, I installed all this on the car and when the car is hot, it starts to smoke and throw oil into my intake manifold and exhaust manifold, and also on the plugs themselves, and there are misfiring Because the oil is on the plugs. The pvc system is not connected. The pvc system is also not connected in the intake manifold. And there is still oil on the valves and there is oil. But the strangest thing is that it doesn't smoke for me at high rpm.

There are following oil sources, typically:

• valve stem seals leaking - X
• head gasket sealing oil path leaking to chamber
• blowby oil from crank case vent hose - X
• blowby oil from valve cover vent hose - X
• oil from piston-liner-system

With that in mind and what you've already tested or neglected (X'd it) it would come from below the head (rings and gasket). But from the pictures I would put that in a 2nd order for further investigations as it looks more to me like valve stem sealing issue. Which stem seals did you install (brand, part number)?

 

[Lotus]

If for whatever reason you mounted the oil rings the wrong way around (swiped bottom and top die), the engine would use oil.
If all 4 are coked up equally, I'd suspect the piston-liner system and a systematic error with this build.
How did the bores look like?
Did you hone the cylinders?

are all 4 equally coked up?

 

[yaggs]

it looks more to me like valve stem sealing issue. Which stem seals did you install (brand, part number)?

I agree. The oem parts are easy to mix up intake and exhaust valve seals. They are the same color and one digit off on part numbers.
Furthermore, if you used supertech seals the colors are unintuitive.
Intake seals are brown
Exhaust seals are blue
Worth checking if you've got the cover off.
Also the valve cover spark plug tube seals certainly go bad over time and allow oil to accumulate on the plugs.