hi i was wondering what is the difference between a d15b2 and a d15b7 or a b16a to a b18a so on a so forth. im kinda curious?

 

The honda engine code brakes down pretty simple.

First letter

D-series "D"
B-series "B"
K-Series "K"

so on and so forth

The next two digits usually are the displacement of the engine.

for example D15b1 is a 1.5L engine. B16 is a 1.6L Engine

The last 2 digits are what set everything apart from one another. So the difference between a d15b2 and a d15b7:

D15b2:

Found in:
1988-1991 Honda Civic GL/DX/LX
1988-1991 Honda Civic Wagon Wagovan/DX
1988-1991 Honda CRX DX
1992-1995 Honda Civic LSi Hatch/Saloon (European Market)
1992-1995 Honda Civic DXi Hatch/Saloon (European Market)
1990-1995 Honda Concerto (European Market)
Displacement : 1,493 cc (91.1 cu in)
Bore and Stroke : 75 × 84.5 mm (3.0 × 3.33 in)
Rod Length : 134 mm
Compression : 9.2:1
Power : 92 hp (68.6 kW, 93.3 ps) @ 6000 rpm
Torque : 88 ft·lbf (12.2 kg/m, 119 Nm) @ 4500 rpm
Valvetrain : SOHC (4 valves per cylinder)
Cam Gear : 38 tooth
Piston Code : PM3
Fuel Control : OBD-O DPFI and OBD-1 MPFI
Redline : 7000 rpm, 6500 rpm rev limiter
Head Code : PM6
ECU Code: PM5/P04

vs

D15b7

Found in:
1992-1995 Honda Civic CX (Canadian model)
1992-1995 Honda Civic DX/LX
1993-1995 Honda Civic del Sol S
1992-1995 Honda Civic LSi Coupe (European Market)
Displacement : 1,493 cc (91.1 cu in)
Bore and Stroke : 75 × 84.5 mm (3.0 × 3.33 in)
Compression : 9.2:1
Power : 102 hp (76.1 kW, 109 ps) @ 5900 rpm (102 hp @ 5900 rpm in U.S.)
Torque : 98 ft·lbf (13.5 kg/m, 133 Nm) @ 5000 rpm
Valvetrain : SOHC (4 valves per cylinder)
Cam Gear: 38 Tooth
Piston Code : PM3
Fuel Control : OBD-1 MPFI
ECU Code: P06
Head code: PM 9-6


Check out these sites. Makes things very easy to understand:

http://en.wikipedia.org/wiki/List_of_Honda_engines
http://en.wikipedia.org/wiki/Honda_D_engine#D15

 

thanks man i appreciate it