so the b21 came in the 90-91 prelude. possible for a b21 vtec? anyone heard of this? or have it? if so how is it? iv had many of ls vtec setups i wanna try something new

 

ummm im pretty damn sure there is only a b16, b18, b20. never heard of b21....

EDIT and a b17

 

never heard off a b21 thats a new one on me

 

I've heard of the B21 but I don't know what VTEC head would fit.

 

yea this is new to my also it comes in a 90-91 prelude SI , wont this be the firs B21 vtec??!?!?!?!

 

have you guys ever read those ls/vtec write ups? the reason why they dont use the old b20s (from preludes and accords) is because the way its built, no vtec head will fit. its a weak motor anyways almost 13 years old by then, why not just get a b20z.

 

hmm b16, b18, and b20 sound ok but a b21 no noodle! Did you try reasearching this topic before posting? Search for B21 on a lude 90-91 might help you out

 

i did search but thanks for the worthless comment

 

the head doesnt fit on it but im pretty sure that motor makes more torque then hp for the factory set up. So if one was to go all out and resleave and build complete it would be a ******* crayz *** motor

 

b21s are shitty motors. I come from the prelude forums, where u used to be a regular when i my 5th gen.

The b21 has a bad oil consumption problem. most of those guys have swapped in jdm b20s to solve their problems.

Stick with a newer b20

 

SO THERE REALLY ARE B21??? WOW I had NO idea.. is it a JDM motor? dohc? vtec? What are the specs if anyone knows off hand?

 

the b21ai is from a 90-91 prelude si
edit: 2.1L, 140 HP, 135 ft. lbs tq, max hp 5800, max torque 5000
from edmunds.com

 

i used to own a b21a1 `lude SI, 1990. it was fuel injected(the others were 2.0 carbed) and it brought me much joy. that block is the bastard stepchild of the b-series engines. it comsumes oil like crazy, and the rings go out b4 150k. it responded well to bolt ons in my opinion. but I definately wouldnt consider it for a frankenstien setup. the bottom end is just weak, and would be an expensive build. i dont think they even make specific aftermarket parts for it.

edit: and for the guy who wanted the specs, someone already gave the hp/tq numbers, just to add to that, it was dohc, 16 valve, non-vtec.