engine

depending on whether it is new or older 8 if it's new and 16 if it's old

8. only rotary engines have more than one spark plug per cylinder

1) There are many engine other than rotaries that have twin or even tri plug ignition. 2) There is an old school twin magneto twin plug HEMI, but I dunnow if that was aftermarket or what. However many of hte 'srt8' hemis run twin plug off a single coil, earlier ones ran a wasted spark later ones have direct control per cylinder.

i have never heard of multi-plug ignition multi-spark yes but all those sparks come from the same plug. even rotary engines only use the one plug per combustion chamber but the can have multple combustion chambers per cylider.

8 Never heard of more than 1 plug per cylinder.

google 'twin plug', it's not that uncommon and you've likely seen many cars that run them but just didn't know it. 'rotary engines only use the one plug per combustion chamber' 1.3l from Mazda run either 6 or 4 plugs on two rotors which have one 'combustion chamber' per rotor, so I'm sorry to say that statement makes no sense. However, I believe on most the plugs fire sequentially to allow for reliability of the ignition system at higher RPMs, is that what you were referring to?

tons of engines have more then one plug per cylinder, although i think hemis have 8... but im not 100%

Wrong!

can we have the specs on this hemi??? what vehicle is it in... ???