My b18b is going turbo. I'm being offered a b18a for cheap. Thinking of buying it for parts or replacement if I blow mine. What you can say??
Thanks

 

as far as i know they are pretty identical the deck hieght is a little different and the b18b has a little better cam giving it 10 ish more hp

 

like scatuli said, the main difference is the camshafts...so i think if you fould a good deal on a b18a, i would go for it

 

Thats it? Just the camshafts? The guy that offered it to me totaled his car. He asked for just $200.

 

If you dont want it i do

 

The B18B also has a better designed head that flows just a bit better than the B18A's

 

if you buy the b18a ill sell you some b18b cams crom a 97 or 96 ls head. i heard these are beefy for stock cams. my friend that i got the head off of use to beat other ls eg's stock vs stock with driver capabilities being the same as well.

 

THe bottom end is identical, the difference is in port size, IM design, cam profile, and ECU tune.

Remember, 90-91 B18A made 130 hp, 92-93 B18A made 140 hp, 94+ B18B made 142 hp. Big whoopty ****.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J. Davis &raquo;</TD></TR><TR><TD CLASS="quote">. Big whoopty ****.

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

AMEN

 

well in that case i have a b18b intake manifold for sale as well as the cams

 

when I put a 1994 B18B head next to a 1990 B18A head, and measured ports with my calipers, they were the same opening size. Passages looked identical to the naked eye, too. chambers also looked the same.

Intake runners I believe are shorter on the B18B..moved the powerband up a few hundred rpm.

 

IM, cams

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by haggar &raquo;</TD></TR><TR><TD CLASS="quote">when I put a 1994 B18B head next to a 1990 B18A head, and measured ports with my calipers, they were the same opening size. Passages looked identical to the naked eye, too. chambers also looked the same. </TD></TR></TABLE>

Hrm, I know there is a visible difference between port sizes if you lay two heads next to each other. Half the B18A **** I have laying around is automagic, so that may be the difference between your findings and mine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eG_6ix &raquo;</TD></TR><TR><TD CLASS="quote">like scatuli said, the main difference is the camshafts...so i think if you fould a good deal on a b18a, i would go for it</TD></TR></TABLE>

Is there no difference in compression...? The B18A still has a 9.2:1 compression...? I don't know either way, but it seems that the B18B might have a little higher compression... Neone know for sure...?

 

Gen2 vs Gen3
Its a B series and alot of the misc parts should swap over.

 

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

Hrm, I know there is a visible difference between port sizes if you lay two heads next to each other. Half the B18A **** I have laying around is automagic, so that may be the difference between your findings and mine. </TD></TR></TABLE>

Maybe you were comparing the 90-91 A's to the B's whereas the 92-93 A's and B's use the same head design.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTC_CiViC &raquo;</TD></TR><TR><TD CLASS="quote">Maybe you were comparing the 90-91 A's to the B's whereas the 92-93 A's and B's use the same head design.</TD></TR></TABLE>

That could be it. I was given a bunch of the heads to use as welding jigs, but do remember I tore one of the small port B18A's off of a 90 LS. The rest I really don't know the what/when/where/why of.

 

Thank you all for the info. What I'm really interest (block, crank) seems to be the same as my b18b, just in case I blow it.

 

joseph, from blundar (from a pgmfi post )

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blundar &raquo;</TD></TR><TR><TD CLASS="quote">correct. B20, B18B and B18A all use the same head casting.</TD></TR></TABLE>