Loss of Car Power, Engine Fluctuations, White Smoke: Gasoline Engine Compression at 9bar

Hello!
My problem is that the car has completely lost its power!
The situation is like this:
-auto fires well
-rotation does not fluctuate
- feel slight engine fluctuations, but not noticeable on the tachometer (on the computer about 50RPM and not always)
-After warming up, the car likes to smoke white, but only after it stands at low speed for a dozen or so minutes and gives it more gas
- the refrigerant is not diminishing
- the oil is not decreasing, it is not increasing
- there is no butter under the cork
-compression on the cylinders oscillates around 9bar !!
8.8 => 10.2 => 9.2 => 9.8 => 9.2 and after the last measurement (2 weeks from the previous one), the second cylinder showed 9.6
-the engine had new GOETZE rings installed, about 30,000 km ago
-after adding oil to the cylinder, compression increases significantly
-Oil used to be castrol magnatec 10w40 and now lotus 10w40

And here's my question, did the rings go to "make love"?
And could only these compression rings wear out after 30kkm and those from the oil would not?
Stuck rings?
Camshaft misaligned?
Valves burned out?
UPG?

It does not write what engine. Have only rings been replaced, without processing of the sleeves?

Hello, there are two options:
- rings (someone might have installed it wrongly), (possibly they sold you fakes)
- burned out valves in the head (a common problem when driving on LPG) (strange that on all cylinders,
if the pressure during the oil test increases quite significantly, this is against the rings,
there is still, but it is rarely possible that the timing has shifted, although once I had such a case in the 1.6 Vectra engine.
provide more information, maybe someone will suggest what is easier to do
I propose to check the timing, if not then you need to tear the head

Write what car with what engine before you pull anything out.
greet

Fiat Bravo HGT 2.0 20V engine
prod 96
bushings, rings, planned head, machining of valve seats, lapping, sealants, etc. were replaced.
block and shaft alignment, new spacer rings,
the block was measured in the factory and the threshold was within tolerance (not palpable by bare hand) and therefore no machining of the sleeve was performed.
rings worn with the rule of 90 °
and if the timing is changed, the oil test should not show anything ?? after all, the valves are not closed then and the pressure goes into the intake / exhaust ??

yes here, if there was no change when pouring the oil, the valves were suspended, and if it was the fault, it lies on the side of the rings

that is, a changed valve timing and burned out valves can be excluded ??
what about the rings ?? since the car does not take oil ??
but he smokes white (only on warm).

Albert23_08_1988 wrote:

the block was measured in the factory and the threshold was within tolerance (not palpable by bare hand) and therefore no machining of the sleeve was performed.

What does it mean?

Especially what you wrote in parentheses.

after dismantling the engine, we "felt" the cylinders and found that there were no sills, and therefore the decision was made to overhaul the engine.
the block went to the machining plant for alignment. and there they measured the cylinders in terms of these thresholds and found that it is within the tolerance, so they did not grind the sleeves.

What is the reason for the engine overhaul?

the cup went
I will add that the crankshaft, 1 connecting rod, 1 piston, a set of bearings, a set of rings, UPG, shaft gear, timing belt, etc. have been replaced

The pressures you entered apply to one cylinder?

Edit, okay I know, there are 5 cylinders, that's why you entered five values.

1. 8.8
2. 10.2
3. 9.2
4. 9.8
5. 9,2


after 2 weeks I measured again 2. 9.6

There were assembly / work direction markings on the rings?

and, unfortunately, I do not know that ... I didn't put them on, when I came, they inserted the last piston, using the appropriate collar.

You had to roughen the finish at least.
Yes, it is not known how what happened.


88-year-old grandmother rarely gets along with a teenager.

romoo wrote:

It was necessary to roughen the finish at least.
Yes, it is not known how what happened.


88-year-old grandmother rarely gets along with a teenager.

can it be a bit brighter?

Ok, was ovalization measured?

I do not know anything...

An engine for professional renovation. This is usually how the rings are replaced. I am closing, there is no need to guess here.

welcome back.
topic solved some time ago.
compression problem solved. the culprit was a wrong timing setting.
the exhaust shaft gear should become loose and properly retracted.
when properly adjusted, compression is around 13 bar with minimal fluctuations.

and as for the oval. this is how it was measured in a plant that aligned the block with the crankshaft and made spacer half rings. dimension was found to be normal and nothing was honed.