That is what I had thought before.
If I go closer to lambda=1 mixture, it will start knocking very loud even tho I have quite retarted ignition timing.
And at higher load (around 25-35% throttle position) it knocks even if going as rich as lambda=0.80 instead of 1.00.
But if I adjust it to lambda=1.25-1.30, it works fine.
So going leaner, e.g lambda=1.20 or leaner, the knock stops and it starts running fine.
That probably sounds a bit weird, and I found it actually quite funny how it works.
The knock is, like I earlier explained, is very similar to diesel knocking noise caused by bad injectors or something like that.
It ignites the mixture too early and burns quickly before TDC - or that is what I am assuming, when it really gets bad.
It is possible, that the behaviour is explained by fuel injector spray, which is not even close to "good" compared to EV14 12-hole injectors or direct injection injectors.
And air and fuel is not mixing so well.
Making it much more difficult to ignite the very lean mixture.
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