USDM Chassis codes/Engines
89-90 240sx Hatchback = RHS13 (KA24E)
89-90 240sx Coupe = HS13 (KA24E)
91-93 240sx Hatchback = RMS13(KA24DE)
91-93 240SX HICAS Hatchback = KRMS13(KA24DE)
91-93 240sx Coupe = MS13 (KA24DE)
94 240sx Convertible = MS13 (KA24DE)
95-98 240sx = S14 (KA24DE) (Sometimes 97-98 S14s are called S14mc)
JDM Chassis codes
89-90 Silvia = S13 (CA18DET)
89-90 180sx = RS13 (CA18DET)
91-94 Sivlia = PS13 (Red top SR20DET)
91-94 180sx = RPS13 (Red top SR20DET)
96-98 180sx = RPS13 (Black top SR20DET)
95-98 Silvia = S14 (Black top SR20DET With slanted valve cover)
99-00? Silvia = S15 (Black top SR20DET With slanted valve cover)
Chassis letter definitions
S=Chassis
R=Hatchback
K=HICAS
P=SR20DET
H=KA24E
M=KA24DE
Engine
-First letter(s) in the code is the Engine Series (CA ,SR, RB, VG, VQ)
-The 2 numbers is the displacement in liters (IE,
24=2.4 ,20=2.0)
-Next letter (if there is one)Is Valve train(IE,
V=VVL[variable valve lift], D=DOHC, neither
Its SOHC
-Next letter is how the fuel is delivered (IE,
E=fuel injection)
-If there is a next letter, then it uses Forced I
induction (IE, T=Turbo, TT=Twin turbo, R=
supercharged)