The B20VTEC discussion thread

[Chr1s]

K swap is a new kettle of fish and it gets expensive quickly. IMHO. K swap is a little more for the serious enthusiast.

The only real main reason of rebuilding the B20, is to do the conversion properly and do it once. B series engines are nearing on 15years old now so they are starting to get a little tired. It would be ideal to build that engine with some goodies here and there while you freshen it up for better power/reliablity also.

You don't need much to be very happy with a 2.0L going from a 1.6L. Most people rave about it and they are going from a 1.8!

[kraiye]

i'd also like to know about the brakes. would it be a legal requirement for a brake upgrade?

[MikeyG]

if you got drums then ye.. but for lets say em1 no they are fine

[Chr1s]

I've seen cars engineered with drums on the rear still.

Most of the braking is done via the front so if you can get a good set of pads in there, you're fine. That "brake upgrade" rule is used a little too loosely, we are not engine swapping some 500whp engine in.

[NSPYRE]

just curious, if u already have a b18c is it better to bore it out, sleeve it and run 85mm pistons or do a B20VTEC ?? would the results be similar?

[bennjamin]

gives you 1980cc compared to 1973cc's to begin with

[NSPYRE]

oh, how about 85.5mm?

[bennjamin]

makes it exactly 2.0l.

[ewendc2r]

is the ITR crank better to use in a b20 build?

I will be rebuilding my b18c7 soon -- but want more than 130-140kw@wheels. thinking of going to 2L or *gulp* lower compression charger build.

[Chr1s]

Same thing, but you will find B20vtec will save you BIG time - NSYPYRE

No, ITR crank is 2mm shorter in stroke. So stick to the B20 thumper - ewendc2r

[ewendc2r]

ok thanks -- read somewhere about the itr crank being fully counter-weighted and assumed the other models werent.... thought this might be better in achieving higher rpm capability / less vibration etc..

so im likely better off putting my itr engine aside for the time being, building a b20 slapping that in and then just rebuilding the b18 and selling??

[TODA AU]

Both the ITR & B20B cranks are full counter.
For a roadie, use the B20 crank. In a race engine, IMO, you're better off with the 87.2mm stroke & narrow R bearings of the B18CR crank.
+ The B20 crank needs more balancing attention than the B18CR crank & is more prone to 2nd order harmonics @ over 8800rpm+