Both engines seem the same to me, so enlighten me. The d15b7 I think is from 92-95 correct? But I just dont know what the difference is between the d15b1 and b2 is from 88-91 years.

 

The Throtle bodies are the big difference, the top Butterfly, opens 1/2 way on the b1, Also the spacer plate, bettween the manifold and throtle body has a smaller diameter, on the b1. So basically there identical except the B1 let less air in. I had pics back in the day, befor i finally converted to Mpfi and realized DPFI was garbage lol.

 

Cool, thanks for the info, Menace! I for the life of me couldnt see a difference in them. But I threw away the DPFI, so no wonder! I did an Si conversion on my friends DX with the b2 motor. Its strange, but the d15 I did the si conversion on actually runs better and is faster than my d16! Must be the lower rotating mass of the d15 (?)

 

the camshaft is also different between the motors, but both will take the si cam

 

D15B1 1.5 8V SOHC PGM-FI 1493 70hp@5500rpm 83tq@3000rpm 88-?? Civic

D15B2 1.5 16VSOHC PGM-FI 1493 92hp@6000rpm 89tq@4500rpm 88-91 Civic DX/LX

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FOMULA91 &raquo;</TD></TR><TR><TD CLASS="quote"> D15B1 1.5 8V SOHC PGM-FI 1493 70hp@5500rpm 83tq@3000rpm 88-?? Civic

D15B2 1.5 16VSOHC PGM-FI 1493 92hp@6000rpm 89tq@4500rpm 88-91 Civic DX/LX </TD></TR></TABLE>


Wrong . . .

I have a 88 hatch with a D15B1 and it has 16 valves and it does run better than everyone elses D16a6's That I have met and raced.

I have :
- Si Cam
- Si Trans
- Si ECU
- Si Intake Manifold
- Si Stock Header with internal porting
- Shifter Buchings
- H&R Springs
- No cat w/ stock muffler

 

wasnt the 8 valve the cx model and the 16 valve the dx model? which model is yours?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93formula &raquo;</TD></TR><TR><TD CLASS="quote">wasnt the 8 valve the cx model and the 16 valve the dx model? which model is yours?</TD></TR></TABLE>

Not exactly. The 8 valve model was the CRX Hf, the d15b6. The d15b1 and d15b2 are 16 valve. The d15b1 was in the STD civic (88-89?) and the d15b2 was in the dx (88-91, certain on that).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mach69 &raquo;</TD></TR><TR><TD CLASS="quote">Not exactly. The 8 valve model was the CRX Hf, the d15b6. The d15b1 and d15b2 are 16 valve. The d15b1 was in the STD civic (88-89?) and the d15b2 was in the dx (88-91, certain on that).</TD></TR></TABLE>

Correct

Mine is a 88 STD d15b1 with 175,387 miles and Comp. at 169, 171, 173, 170 &lt;------ Amazing I know . . . All with in 3% - 4%