Can I have good compression and 0 % leak down and still have bad oil rings or a cracked block letting oil leak in the cylinders?
GREAT QUESTION.! OK now I see you have many posts and topic?
you need to have 1 post 1 top, (oil burner) do that use comment to the one post so it all stays as one.
YES ENGINES ARE AN AIR PUMP, HUGE.
EACH CYLINDER IS,
why not lead off with a real problem and all evidence first.
yes compression test can show 200PSI easy with 10:1 CR
both tests only prove the top 2 rings are good and cyl walls not scored hugely.( lead down at TDC)
no engine or maker told at all.
those other questions, about cracks
well gee , depends where the cracks are. and how bad they are.
freeze damaged water jackets? (you do know the machine chip pressure tests the block and head to find cracks not seen
and the cracks in heads can go anywhere wants. port, combustion chambers or water jacket to top if head OIL side. lifter side.
most times the leak-down test finds bad rings and is done at TDC.
so only finds cracks a TDC, unless you do tricky tests just after valves closed.
read the 100 point tests of of engine rebuild. it's huge. CHECK IT OUT FIRST.
oil consumption a question here?
oil control rings bad, or not seated or wallS with scoring
valve seals bad, are first to fail most time.
or valve stems guides so loose it beats the seals to *****.?
clogged PCV , and it burns more oil and leaks out seals.
the compression test is done , at 300RPM starter running.
warm/hot engine, not cold, all sparks out, W.O.T AND FULL BATTERY CHARGE ! factory manuals shows PSI to expect.
and is altitude dependent, (need chart ask)
AT THIS TIME THOSE PISTONS MOVE REAL FAST
AND WiLL IGNORE SOME SCORING AND CRACKS.
Due TO SWEPT SPEED ALONE.
and the test repeated with 1/2 teaspoon of oil, down spark hole if PSI jumps high rings are not seating.(for all the reasons)
SEE WHY LEAKDOWN FINDS MORE LEAKS ,IT'S SLOW
Wish I new what was the problem , at the beginning,
not told. what put you here, with no car stated, engine or size.
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