Pronunciation of a double C [closed]
You can of course pronounce these '-cc-' words however you like; but in most (or all) places where English is spoken, the standard pronunciation uses 'ks' (or 'x', if you prefer).
Here are links to Cambridge Dictionaries' entries for accelerate and eccentricity; both the UK and US pronunciation clips use 'ks' for both words.
That being said, I have certainly heard the 'ss' pronunciation being used with accelerate, eccentric and accessory, so your pronunciation preference does not put you completely out on a limb.