I dunno if this has been done before or wutever, i havent really looked it up that good, but im curious; will a b20b crank fit in directly into a b18a. I dunno i just thought about doin this but still not sure. i need money and its a bitch paying alot of bills when i wana built my engine already? So right now im just doin research.

 

Yes it will fit into the motor just fine

 

its the same crank

 

Like he said. Its the same crank. 89 mm stroke

 

b20b/z=84mm LS. 3.504 crank, 5.394 rods. i bet they have the same castings (pr4 for b18a's, i dont know if b18b's carry the pr4 or a p74)

 

Deos he need to buy new crank bearings for it? or they are interchangable also?

Don't mean to jack your thread bro..Just having the same questions as you.

 

they're interchangeable... but you dont want to use used bearings if thats what you're getting at. also, anytime putting a new crank in the motor, gotta check mains for out of alignment and out of round or any taper. cranks and blocks are basically a matching set, so a used crank in a used block can be dangerous. best thing to do is have the block line bored then run an oversized bearing.

 

but wont it make it a 2.0liter or will i need something else. Im just curious.

 

you want your LS to be 2 liter? punch it to 84mm then get new pistons. thats it.

 

Oh I see, yea i was thinking of putting some of those but then i was gonna have to resleeve it and stuff, and then noticed it was gonna be too much of my daily driven. So i might just stick with some 11:0.1 C. pistons with a 83mm bore, and MAYBE a 92mm stroke.(I LIKE TORQUE) But thanks Guy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92bluteg_ls &raquo;</TD></TR><TR><TD CLASS="quote"> 83mm bore</TD></TR></TABLE>
why? since you would have to resleeve anyway, might as well go 84, 84.5. Pistons are easier to come by at this size as well, 83mm is a custom job normally. Just my 2 cents

 

you can punch factory sleeves to 84.5mm. thats all the b20b/z's are. i dont know of even an aftermarket b-crank that is 92mm. the only sizes i've seen are 89mm (b18a/b, b20b/z) and the 95mm (b20/b21a).