Driver side is super clean, driver side has a very faint dark color but not like it is over fueling or running too rich
Driver side is super clean, driver side has a very faint dark color but not like it is over fueling or running too richTailpipes black on the inside?
I want to put a new set of plugs but before I do that I’ll wait for some comments and suggestion regarding my compression and leak down tests.I’m still saying it’s running a bit rich. Not pig rich or anything but those plugs are not showing me the burn is clean.
Probably it is just the smell of the combustion not necessarily raw fuelI would think any smell of gas in the oil is no bueno.
I will do both tests tomorrow at operating tempSo compression and leak down tests need to be done with the engine at operating temperature.
That makes sense, but have you or any of you find out this whole thing goes the opposite?Reason behind it is metal expands when hot so you want everything up to temperature to close up the tolerances. Think ring gap and as the motor heats up those gaps get smaller (how small depends on the setup) and cylinder bore gets smaller. This will all increase or at least should increase the compression numbers and decrease the leak down percentage.
And here they are. Leak Down where did they leaked thru and compression tests:That makes sense, but have you or any of you find out this whole thing goes the opposite?
I’m saying this because comparing the cold compression test I ran looks higher than another test I did not too long ago on a warmed up same engine, or maybe my compression tester is giving me false readings.
So seeing the leak down numbers on this cold engine should I assume that those numbers will get tighter than that? Not that I will go by that, I put everything back warm it up and re-do both tests this afternoon.
I couldn’t agree more with that statement.Something is off in this whole scenario. It just does not track. A 306 getting only 9ish mpg should have a much bigger trail of evidence showing up.
There is some important information missing.
I don’t have that fact but if I have to guess with good amount of certainty I would say somewhere around 65 - 70kHow many miles on this engine build?
So, come clean then.You can ask me what have I done to solve this mystery… I’ve done it!
I wish this was a troll but it is not.So, come clean then.
What information is missing that we have not seen yet?
What was the solution?
Or is this just an Epic Troll?
Yeah I’m tempted to take everything apart deglaze the cylinder walls by honing them and get some good file to fit rings.If you are wiling to tear it down then go for it. Honing the cylinders and then custom gaping some good rings on the stock pistons will for sure help. Take the heads to a shop and have them clean them up (deck, lap the valves, check the springs, and put new valve seals on them). I would also suggest a new oil pump and timing chain of which get high quality on both.
As for the ECU trying to compensate for the three cylinders being of lower compression but the cylinder balance test shows good then I doubt that. If the ECU even has this strategy it would have to show an imbalance to try and correct.
What is bothering me is that the compression tests are not jiving with the leak down test if the test equipment is known to be accurate and the tests were performed correctly. I know you had the motor at operating temp but I do not know how you did the testing. Biggest thing there is you have to make sure that both valves are close during the leak down test.
So here I would expect either Cylinder 1 to have less compression than Cylinder 4 or Cylinder 4 to have more compression than Cylinder 1
Cylinder 1 - 31% with 130 psi
Cylinder 4 - 17% with 130 psi
And here I would expect either Cylinder 1 to have less compression than Cylinder 5 or Cylinder 5 to have more compression than Cylinder 1
Cylinder 1 - 31% with 130 psi
Cylinder 5 - 21% with 120 psi
Those two examples are completely opposite of each other so needless to say it bothers me. Maybe I am reading into this completely wrong but its not what I have typically seen. Typically the less the leak down % is the higher the compression is.
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