So I bought this 90 DX.. D15B question

[Korax]

I bought this car off a friend. He has had the car for quite a few years, but I didn't know a whole lot about it.. not thinking it was anything special. So, when I went to look at it and take it for a ride I stopped and looked under the hood, obviously. It looked clean, sounded good, at quick inspection didn't seem to be leaking, it looked like a normal DPFI D15B2 or w/e is supposed to come in a 90 DX. I buy it. About a week later I go over and get all the goodies that came extra (EF9 sir seats,d16z6 head, etc) and he is telling me how this car has some JDM Vtec motor in it. He is a bit of a talker sometimes so I thought he was bullshitting me and procceded to start to call him out. I mean it is DPFI manifold and all. Well, we cleaned the stamp of and it is a D15B with no other number. I know there was a DPFI D15B that came in an old Japanese 88 Civic/CRX and was obviously non vtec. Here is the weird thing, there is a block off plate on the head where a seleniod should be. It's probably just be the non vtec DPFI, but why would it be like this? I wouldn't think an OBD1 MPFI could run with the DPFI manifolds,wiring/plugs,etc. The pics I could find of the Vtec d15b also have the plugs and wires/oil cap reversed. The kid my friend bought the car off him told him the stuff he told me. WTF is this thing? I also need to take off the heat shield to find out what is stamped on the head. No time today.

 

[D16SiHatch]

unless someone swapped a shittier head onto a vtec d15b bottom end, then it's a jdm non-vtec d15b. not very common, but nothing special either.

 

[kg728]

Yeah, it's a d15b non-vtec... I have one in my 91 sedan. It's basically the same as the d15b2 as far as power is concerned. I think the block off plate is used if you run it carbureted... Oh, and the vtec d15b has the spark plugs on the front of the valve cover, the opening for the vtec solenoid is much longer, and they usually say 'vtec' on the valve cover.

 

[jlicrx]

yes, that D15B is from a 88-91 JDM Civic/CRX and was available with single carb with 90hp or dual carb with 98hp or dual carb with 103hp - the block-off plate is where the mechanical fuel pump was located - if you look at the camshaft, you will see an extra lobe which ran the mechanical pump

 

[jlicrx]

The D15B is a JDM engine that came in several different variations in many different cars from 1988 to 2005 – This is a partial list (there are more) of the various D15B configurations and the cars they came from in Japan:

OBD0 - Single Carb – Compression Ratio 9.2:1 – 91ps – Found In:
88-91 Civic 4 door Sedan – Models 35M and 35U
88-91 Civic 3 door Hatch – Model 25R

OBD0 – Dual Carb – Compression Ratio 9.2:1 – 100ps – Found In:
88-91 Civic 4 door Sedan – Model 35X
88-91 Civic 5 door Shuttle – Model 55X
88-91 Civic 3 door Hatch – Model 25X (105ps in 5 speed – 100ps in automatic)
88-91 CRX – Model 1.5X (105ps in 5 speed – 100 ps in automatic)

OBD1 – Dual Carb – Compression Ratio 9.2:1 – 100ps – Found In:
92-95 Civic and Civic Ferio – Model MX

OBD1 – VTEC – Compression Ratio 9.3:1 – 130ps – Found In:
92-95 Civic and Civic Ferio – Model VTi
93-95 CRX Del Sol – Model VXi

OBD1 – VTEC-E – Compression Ratio 9.3:1 – 94ps – Found In:
92-95 Civic and Civic Ferio – Model ETi

OBD2 – Non-VTEC – Compression Ratio 9.4:1 – 105ps – Found In:
96-2000 Civic 4 door Sedan – Model Ri
96-2000 Civic Ferio Sedan – Model Mi
97-2000 Integra SJ (Joyful Sedan) – Models LXi and EXi

OBD2 – VTEC – Compression Ratio 9.3:1 – 130ps – Found In:
96-97 CRX Del Sol – Model VXi

OBD2 – VTEC (3 Stage) – Compression Ratio 9.6:1 – 130ps – Found In:
96-2000 Civic 4 door Sedan – Model VTi
96-2000 Civic Ferio Sedan – Model Vi
97-2000 Integra SJ (Joyful Sedan) – Model VXi

OBD2 – Non-VTEC – Compression Ratio 9.4:1 – 105ps – Found In:
2001-2005 Civic Type B
2001-2005 Civic Ferio Type C and Type C4 (4wd)

OBD2 – VTEC – Compression Ratio 9.9:1 – 115ps – Found In:
2001-2005 Civic Type G and Type G4 (4wd)

OBD2 – VTEC Lean Burn – Compression Ratio – 10.2:1 – 105ps – Found In:
2001-2005 Civic Type Ie

 

[Korax]

Ah, I see now. I figured it was just the dual carb OBD0 but that hole with the plate just made me curious. Thanks for the info.

 

[D15Beater]

Being a carbed engine originally its got a higher compression ratio, which means when ran off MPFI it pulls like a bull on crack. Simple to do if you get the parts....

 

[Korax]

Aye, I have done the whole MPFI/v-tec wiring thing when I swaped my other hatch. This thing is actually pretty good for a DX. The extra 10-20 hp and the Si tranny really makes a dif. It can go up hills.. haha.