Some info on the 240SX..
89-90s have the KA24E. This is the single cam 2.4 liter engine making about 140 horsepower.
91-94s have the KA24DE. Almost the same engine except dual overhead cam, higher compression and a few other small changes, it makes 155 horsepower.
The SR20DET is found in 180SX/Silvia K's in countries outside the US.
91-93 180s/Silvia K's have the redtop SR20DET making 205hp with a t25 turbo.
94 or 95-96 180 K's have the blacktop SR20DET which is the same as the redtop.
95-98 Silvias have the blacktop SR20DET with variable valve timing and a (I believe) t25 turbo, making about 220hp.
99+ Silvias have an SR20DET with a (again, not 100% sure on this) t28 turbo, making about 245hp.
The chassis code is S13. R symbolizes it's a fastback like the 240 hatch or the 180SX. P means it's got an SR20DET. RPS13s do not exist in the United States. M signifies a KA24DET and H signifies a KA24E, so if you've got a stock 240SX it's either a H/MS13 or RH/MS13.
Early model 180 and Silvia K's (89-90) used the CA18DET (where the 180SX name was derived from originally). This is a 1.8 liter turbocharged engine making about 175 horsepower. This engine has an iron block compared to the SR20's aluminum block and has a better valve train, as well as the use of a timing belt instead of chain. The problem with these engines however is that they're quite old.
Anyway, I reccomend you get an RX-7. Everyone, including myself, already has a 240SX. Do something different and get the RX-7 then get super famous drifting it so all the dorifto kids will stop hounding my car.
