I'm going to run a turbo setup on a B18A1 or the B18B in my civic and i was wondering if there was a compresion difference between the two motors?? If there is what is the compresion on both of the engines????

 

the b18a1 is the civic SiR or rather the CRX DOHC VTEC motor, and the B18b is the integra GS motor the 92-93 year motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Austinbionic316 &raquo;</TD></TR><TR><TD CLASS="quote">the b18a1 is the civic SiR or rather the CRX DOHC VTEC motor, and the B18b is the integra GS motor the 92-93 year motor</TD></TR></TABLE>

What? B18A1 is a Non-VTEC DOHC 1.8L...and it came out of a 90-93 Integra LS/GS/RS...the B18B is the same motor, but out of the 94+ Integra LS/GS/RS.

To the original question, I'm not sure if there's a difference in compression.

 

i believe they have the same compression

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Austinbionic316 &raquo;</TD></TR><TR><TD CLASS="quote">the b18a1 is the civic SiR or rather the CRX DOHC VTEC motor, and the B18b is the integra GS motor the 92-93 year motor</TD></TR></TABLE>



same motor, diff years, have a few parts that differ, but you are not going to notice the diff.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Austinbionic316 &raquo;</TD></TR><TR><TD CLASS="quote">the b18a1 is the civic SiR or rather the CRX DOHC VTEC motor, and the B18b is the integra GS motor the 92-93 year motor</TD></TR></TABLE>

You are an idiot. Don't give out information if you don't know what the hell you're talking about.

B18A's were in 90-93 Integras and B18B's were in 94+ Integras. Neither have VTEC. They both have 9.2:1 compression and pretty much the small differences lie in the head. The 94+ had different cams and some other small changes. I think the intake manifold bolt pattern is slightly different. Also, 90-91 motors are OBD-0, 92-95 motors are OBD-I, and 96+ motors are OBD-II. For simplicity sake, if you have a OBD-I it is easiest and cheapest to get a OBD-I motor.

 

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

You are an idiot. Don't give out information if you don't know what the hell you're talking about.

B18A's were in 90-93 Integras and B18B's were in 94+ Integras. Neither have VTEC. They both have 9.2:1 compression and pretty much the small differences lie in the head. The 94+ had different cams and some other small changes. I think the intake manifold bolt pattern is slightly different. Also, 90-91 motors are OBD-0, 92-95 motors are OBD-I, and 96+ motors are OBD-II. For simplicity sake, if you have a OBD-I it is easiest and cheapest to get a OBD-I motor.</TD></TR></TABLE>

damn My mistake I thought that was the b16, hell when u've been doing barke jobs and then change ur spark plugs and then to a math class u'll be tired

 

Honda Hick covered just about everything. About the only difference you'll find with the newer B18B's is the lack of the PCV system just as you'll find on the B20B/Z.

 

how do you figure obd1 is easier to work with than obd0?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Haberdasher &raquo;</TD></TR><TR><TD CLASS="quote">how do you figure obd1 is easier to work with than obd0?</TD></TR></TABLE>

more options out there

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">i believe they have the same compression</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">Honda Hick covered just about everything. About the only difference you'll find with the newer B18B's is the lack of the PCV system just as you'll find on the B20B/Z.</TD></TR></TABLE>

Enough Said

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by envision2teg &raquo;</TD></TR><TR><TD CLASS="quote">
same motor, diff years, have a few parts that differ, but you are not going to notice the diff.</TD></TR></TABLE>

I agree completely.

As far as OBD0 vs OBD1 vs OBD2... run what you brung. I see no reason to advocate OBD1+ over OBD0 unless you plan on revving your LS past 9600 rpms (LOL) which is the point where the crank signal inverts itself on OBD0.

 

Some b18a's have 130hp, some have 140.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Haberdasher &raquo;</TD></TR><TR><TD CLASS="quote">how do you figure obd1 is easier to work with than obd0?</TD></TR></TABLE>

It says he has a civic so I was just kind of figuring he had a 92-95 (don't really know why i thought that when i wrote that). Whatever car he has, it's easiest to just match up that OBD motor with the OBD of his car.

 

just to clear something up...
the bottom end has nothing to do with OBD's correct?
so someone can run a B20 block and then match the head to whatever OBD the chassis has and be ok?
i was thinking B20 block with a B18A head in my EF...this will work the same as a B18A lonblock correct?
thanks

 

You don't even have to match the heads up, only the wiring harness and distributor. I have a complete B18A1 swap in my 92 civic.

 

Just to add a few more things. Injectors also matter, nonOBD's are low impedance and require and inline resistor box where as most OBDI/II (excluding some Preludes) chassis/wiring harnesses are set up for high impedance injectors. The last major thing that normally comes with a bottom end would be the alternator, nonOBD and OBDI's are the exact same (round plug) where as in '96 they switched to the cleaner looking smaller square connector. But just as DaX said, the motor itself really doesn't matter. If you chose to do your straight B20 motor all you'll need is a PR4 ECU, low impedance injectors, nonOBD LS dizzy, and an nonOBD/OBDI alternator. Rework your factory harness and you'll be set.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97hb &raquo;</TD></TR><TR><TD CLASS="quote">Some b18a's have 130hp, some have 140. </TD></TR></TABLE>

And they all have identical PR4 rods and PR4 pistons, as do the 142 hp B18B's. Which means for turbo use they can all hold the same power.

 

Different cams generate different hp numbers perhaps? I don't really know as I rarely ever deal with nonVTEC cylinder heads.

 

We had this exact thread recently... while there are cam and intake manifold changes between B18A and B18B, the biggest change is in the ECU tune. 400 rpms higher redline and 4-5 degrees more advance at WOT in the midrange rpm band. I'd be pretty certain the 130 vs 140 hp B18A's differences are entirely in the ECU tune betwee OBD0 and OBD1... that leaves a magnificent 2 hp to be picked up by the much coveted and expensive B18B cams/intake.

 

Sweet 2 more hp, haha. I never really thought about the ECU maps but I'm sure you are right. Thanks