Hi, which are the differences mecanic between these engines?
B16A 150hp
B16A2 160hp
B16A4.5.6 170hp
B16B 185hp
Thanks

 

not much of a b guy but here goes.

b16a - 1st gen VTEC - obd1
b16a2 - 2nd gen VTEC, higher CR?, obd2
b16a4.5.6 - no idea
b16b - CTR cams and pistons

pretty sure its all same block except for 1st gen b16a which may be closed deck.

~boom

 

B16A came with cable tranny, while the A2 and B came with a hydro tranny.

Haven't heard of B16A4,5 and 6 though. Euro motors maybe?

 

I wanted to know what was different between 150hp, 160hp, 170hp and 185hp of B16x.

 

The 150, 160 and 170 hp versions (all B16Ax) are essentially identical. The 170 hp version has a slightly higher compression ratio due to different pistons. The 160 hp version is identical to what was sold here in the del Sol VTEC and the '99-'00 Civic Si. The 150 hp version is identical mechanically but has a lower-powered ECU tune for use with an automatic transmission.

The B16B is vastly different. The block is from a B18C but with a shortened stroke, and the pistons produce a very high compression ratio. The head is the same as a B18C5 in that it's a PR3 (B16A, B17A) casting with a port/polish job, more aggressive cams and stiffer valve springs. Early B18C5 heads have a slightly different intake cam. It shares its intake manifold and throttle with the B18C5 as well. Essentially it's a later B18C5 with different crank, rods and pistons.

 

Thanks
it's what I wanted to know (I have a French B16A2 160Hp at 7600 and rev limit 8400)

 

which are closed deck and which are open deck

~boom

 

they're all open

 

B16a SiR1 160Hp JDM SIR
B16a2 160Hp USDM 99 si
B16a3 160Hp USDM Del-so DOHC Vtec
B16a SiR2 170Hp JDM SIR2 Bigger Cams. Higher Cr
b16B 185Hp JDM Civic Type R Port n Polish, Higher Cr, Bigger Cam and better Valve Train

 

AFAIK no B or D series engine has ever been closed deck.