I have an RC car which works with 8 AA alkaline batteries, which make a total of 12 volts.
I want to replace the battery with a 12v 2A power supply (batteries cost away too much...)
Do you think the 2 A of my power supply are enough ?
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In my experience, AA batteries fairly well never have a capacity >2.7Ah (usually 1.8-2.3Ah), so as long as your pack of series-connected AAs lasts >1hr in use, then you're for sure safe.
EDIT: At very worst, the 12V/2A power supply might yield a small reduction in initial power vs. the batteries, but should for most purposes be sufficient.