I'm just wondering what the differences would be between a b18c bored out to a 2.0, keeping the same heads, cams and what not to keep it vtec, and a b20 with a b16 head, vtec cams, etc. Will they have the same output? How will the toque look because I know b20's have a shitload of torque so will boring out the 1.8 give it a torque curve like the b20? And what are the weight differences between the b18c and b20z?

Another question; my brother insists that anything more then a b16 is going to hurt the handling abilities of the Rex.. but I want more displacement then 1.6 and still keep the handling. Couldn't I just get a carbon fiber hood, fenders (if they're made) and stiffer front springs? **** maybe even take out the bumper supports.. wouldn't that make up for the heavier block?

Thanks for anyone who replies!!

 

Due to the fact that the B18C has a shorter stroke than the B20 (87.2mm vs 89mm), a resleeved B18C will have a smaller displacement (1927cc with 84mm pistons vs 1972cc for a B20 block). But as you can see, the difference is not too great. And you can always use 84.5mm pistons for 1950cc displacement. Furthermore, resleeving a B18C has other advantages over a CR-VTEC. First of all, you get a motor that is VTEC ready right out of the box. You get a nice, strong block, a main bearing girdle, piston squirters, better oiling, and stronger rods (if you do not upgrade them, that is). All of this needs to be dealt with on a B20 block at significant cost. But it is already done with a B18C. Also, if you live in California (or some other smog strict area), hybrid motors like the CR0VTEC are not legal. But a resleeved B18C will pass the visual inspection without any problems.

As for weight, the weight difference between a B16A, B18C, and CR-VTEC is really not that great.

 

go with the b20 with b18c head, seen it happen..

 

If i was you i would do a GSR block with golden eagle sleeves and do it to 84.5 pistons and that would make it 1956cc with a gsr crank..If you use a gsr block with 84.5mm pistons and a LS crank you will get 1996cc...but you have to take out the oil squirters and plug them up because the LS crank hits them...

Thanks
Ross

 

keep it vtec, resleeve the GSR block, and machine the combustion chambers to fit the top of the sleeves. having the head ported for more displacement is also going to be crucial.

 

i agree with this 100%.

go with the vtec block bored out. you will lose some tq b/c of the shorter stroke, but you will make good power.

 

Alright, if I were to resleeve a b18c block to make it a 2.0 wouldn't that hurt the engine if I were to go FI because there is less space between cylinder walls (I'm not sure on this, and I wouldn't be pushing alot of boost, I would have a JRSC set at 8PSI)? And also, how do I go about getting the same torque numbers as a b20, with a b18 bored out to a 2.0? I really want the everyday torque that the b20 offers and from what I gather the b20 has a longer stroke which makes it have more torque then a b18, so how do I get the same stroke in a b18 bored out to a 2.0? Yeah, I'm confusing myself with these questions so if anyone can shed some light on this that would really help.

 

You can run a b18a/b or crv crank(all are 89mm) in the vtec blocks, you just need to use the non vtec length rods. I did this with mine. But now I'm in the process to switching back to a gsr crank and opening up the bore to 85mm instead of 84. The power drops off to soon with my head/cam set up running the 89mm crv crank.

 

TBone - Could you please translate that into English? Sorry man I'm not the most mechanically inclined person, so I'm not really sure what you meant by that. Did you mean that I could use a b18c block and a crv crankshaft with the non vtec length rods and that would give me the same output as a b20vtec? Or do I need to bore out the block, put in bigger pistons, then use the crv crankshaft with the non vtec rods? Sorry if these questions seem dumb!

P.S. - I'll search for this, but if anyone can post this before I find it, what is a crankshaft?

 

You cant bore a b18c to 84mm, you need to sleeve it first, then you can. The crv motor has a 89mm crank and a 84 mm bore, so if you sleeve the b18c block to 84mm and put the ls/crv crank into it , you have a b20 but better.