well the benefits to having a single cam motor is faster engine response, they rev up faster. therye also very cheap to buy and being built properly can be very great motors, bisi ezerioha proved that with
this car. my buddies rps13 240sx still rocks the n/a ka24de motor and hes got it fully rebuilt from top to bottom and the car kills the autocross events.
EDIT: ive never seen the turbo f22b1 around but the same guy with the 240 tells me its pretty quick.