Another interesting theory here sometimes proposed by certain members also crashed like a house of cards.
Some said the current engine is a hybrid - or like I said FRANKENSTEIN - engine using the WS-15's core and parts from the WS-10 + AL-31.
With some help at the SDF, here's a verbatim translation:
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左手王ZSW asks pupu-2012, "I heard a rumor that WS-10 fitted on the J-20 has WS-15's core wrapped in WS-10's casing... Don't know if this is true or not."
pupu-2012 replies to 左手王ZSW, "Naturally NOT true."
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End translation
So contrary to what some fan-boys always potsed, Pupu unambiguously and categorically
refuted it.
Oh, these are bad days for chest-bumping fan-boys.
Anyway, like others already said: A Chinese engine financial on the PLAAF's premier fighter is a great achievement and worth to celebrate.
Deino