Is there a difference between an 1988-91 B15 a1 and a B15a2 head?

 

Never heard of a B15 before. Do you mean B16A1 & B16A2???

 

I am sure he means the D16a1 and 2, but i can't answer his question..

 

Why would he mean those? It's most likely he's either talking about the B16A1 and B16A2 or the D15A1 and D15A2. Stuff like that is on the SAT.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TeamSlowdotOrg &raquo;</TD></TR><TR><TD CLASS="quote">Why would he mean those? It's most likely he's either talking about the B16A1 and B16A2 or the D15A1 and D15A2. Stuff like that is on the SAT. </TD></TR></TABLE>

d16a1/2 came in the first gen integras. I am not aware of any differences in the head design, but the pistons are different between the years.

You might have better luck posting this question in the ef civic/crx forum, as some of those guys swap this motor into those cars.

 

D16A1 = USDM "ZC" 86-89 Integra
D16A2 = Euro "ZC" CRX/Integra
D16A6 = "ZC" Australia and some asian countries outside of Japan
ZC = JDM
AFAIK, all are pretty much the same engine with minor variations in cams, intake and exhaust manifolds and cam gears. The other variation is the early engines had a vacuum advance ignition ("brown top" cam cover), the later had electronic distributors ("black top") and domed pistons for slightly higher CR. AFAIK, the heads are the same...

The D15A1/A2 are the 84-87 Civic/CRX motors, probably not what you're talking about since you mention 88-91. And there's no sich thing as a B15anything of course.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jsi &raquo;</TD></TR><TR><TD CLASS="quote">D16A6 = "ZC" Australia and some asian countries outside of Japan</TD></TR></TABLE>

What about USDM 88-91 Civic/CRX Si???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">

What about USDM 88-91 Civic/CRX Si???</TD></TR></TABLE>

Aw, sorry. Brain fart... Yeah that's the SOHC USDM Si motor. It was the D16A8/A9 i was thinking of. From what i know they had a mix of these for export to Europe and Asia. Still the same engine as the ZC/D16A1 basically...

 

b15???????????

 

OOOOPS!

D15A1 16 valve head for base 1492cc Civic
D15A2 16 valve head for 1492cc DH Civic

1988-91.

 

D15B1 = 70 hp at the crank
D15B2 = 92 hp at the crank

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jsi &raquo;</TD></TR><TR><TD CLASS="quote">The D15A1/A2 are the 84-87 Civic/CRX motors, probably not what you're talking about since you mention 88-91. And there's no sich thing as a B15anything of course. </TD></TR></TABLE>

Actually, the 84-87 1.5 liter motors were EW engines. EW4 was the FI 1.5 in the Si. EW3 was the Carbed 1.5. The EW2 was the 1.3 Carbed car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by madhatter &raquo;</TD></TR><TR><TD CLASS="quote">

Actually, the 84-87 1.5 liter motors were EW engines. EW4 was the FI 1.5 in the Si. EW3 was the Carbed 1.5. The EW2 was the 1.3 Carbed car.</TD></TR></TABLE>

Doh, i'm completely fugged up with the D15 variations. Maybe i should have just checked under the hood of my 91CX eh? Lol...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by madhatter &raquo;</TD></TR><TR><TD CLASS="quote">

Actually, the 84-87 1.5 liter motors were EW engines. EW4 was the FI 1.5 in the Si. EW3 was the Carbed 1.5. The EW2 was the 1.3 Carbed car.</TD></TR></TABLE>

You're close. I am used to the '85 Si having the EW3 engine number prefix, with EW4 being '86-'87 Sis. I don't think the D15A3 designation was used until '86, but many people call them EW4s. EW3s and EW4s have few differences.

EV1 was the 1.3 engine used in the '84 CRX "base" model. I believe all the 1.5 carbed engines (in the US) were designated EW1, even the 4WD Civic Wagon (with the other bellhousing bolt pattern). This applies to '84-'87.

I checked engine blocks in my garage tonight, and confirmed EW3 on 2 blocks as well as D15A3 on another.

 

Yep 70HP and 92HP.

Now what parts make up the difference?

Is it in the heads???

 

The bottom end is identical. PM3 pistons in both, with the same geometry and everything.. The difference is a restrictor plate in the DPFI throttle body, and quite possibly (I'm not sure about this) a milder cam.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kedwards &raquo;</TD></TR><TR><TD CLASS="quote">

You're close. I am used to the '85 Si having the EW3 engine number prefix, with EW4 being '86-'87 Sis. I don't think the D15A3 designation was used until '86, but many people call them EW4s. EW3s and EW4s have few differences.

EV1 was the 1.3 engine used in the '84 CRX "base" model. I believe all the 1.5 carbed engines (in the US) were designated EW1, even the 4WD Civic Wagon (with the other bellhousing bolt pattern). This applies to '84-'87.

I checked engine blocks in my garage tonight, and confirmed EW3 on 2 blocks as well as D15A3 on another.


</TD></TR></TABLE>

Huh. I will have to check my block as well. I just searched up parts at Advance, and they all came up with the EW designation for my 86 Si. So's I thought they all were... Thanks.

 

The 70HP was designed for fuel economy. would the restrictor plate promote fuel economy? I can see the milder cam promoting fuel economy. I can see the cam and restrictor plate killing 22HP. I don't see the plate helping gain fuel economy.