This may be stupid and if it is sorry
What makes an governs a motors obd? As in if you had an lsvtec a b16a2 head but a 92 integra ls block what obd would that motor be?
Or if you had a b16a2 from a 99-00 civic si head with a jdm obd0 b16 block what obd would that motor be?
Thanks for looking

 

Its the ECU and its sensors that determines a cars OBD type...

That said, most of the sensors and other OBD specific things (on Hondas) are on the intake manifold...

So if you take a D16Z6 from a 92-95 Civic EX/Si that is OBD I, and take an intake manifold from D16A6 and use the D16A6's PM6 ECU, you would be running a pre OBD car...

Likewise if u take the Z6 manifold and ECu install it onto the D16A6, and wire up OBD1 (the wiring is also different because of the sensors) youd be running an OBD1 D16A6...

 

so would this work in the b series also
using a b16a2 motor but a b16 intake manifold and ecu thats obd0 would that make it obd0.

 

Yea, it should work, there may be a few more sensors that are required on the block to make it preOBD... Like I think the B16A (if not all DOHC VTEC engines) have a knock sensor, not sure the specifics if those are OBD specific or not tho... Im honestly not too familiar with B series engines yet... But maybe someone else, whos more knowledgable on the B series, can give u a more definitive answer on that...

 

there is no point in matching that head with that block (b16a2 with b16a)...not even worth it.

the lsvtec is a cool motor setup but you need to have a little experience before you do this swap.

in any case, dont down-convert the engine. go ahead with what obd it is...

the easiest and definitely the choice over the b16a2 head with the b16a block, would be to buy the b16a longblock and go with that, no conversions, cheaper setup, its easy.

if you go with the lsvtec go ahead and convert to obd-1

dont screw with obd-2 parts or swaps, this is a biach to do and would have you pulling out your hair.

 

Only two things, really: the ECU and the distributor. Low and high impedance fuel injectors can be swapped easily enough and the sensor set is basically the same with different plugs here and there.