I thought "bumper"="fender"? And "gearstick" is what I call "gear lever" (and "lever" rhymes with "beaver"!)
Engine=motor
Main beam=high beam
Carburettor=carburator (or carburater?)

What do you US-ers call: radiator (and grill), dipped headlights, door pillars, dipstick, head gasket, cylinder head, gearbox, con[necting]-rod, camshaft, timing chain, fuel injection, spare wheel, accelerator (assuming the correct technical name is not "gas pedal"), demister ... anything else?

Steve