I am looking at doing an all motor setup and def. want a b20. was wondering if an R head would be a good choice? Or should I just get a whole Type R motor instead?

 

if your set on the b20, the type r head would be best. actually CTR head would be best. i would just get an ITR motor because its reliable for the same or less price of a reliable b20vtec. the b20vtec is ganna get old and out like the lsvtec. its all a fad.

 

true, but how would the torque be on the B20 over the C5?

 

I am curious...why would the CTR head be a better choice than a ITR head?

Also, why would a CR/VTEC get old and played out just like an LS/VTEC? If this is true then why would a straight B18C5 or B18C1 not get played out as well? Heck, the B18C1 has been out since 1994 and the B18C5 since 1997. Are the B18C5 and B18C1 just a fad as well?

Let us know.

-kenji

 

To answer 2fastGSR's question...

An ITR head is a good choice for a LS/VTEC but ideally you would want to spot face the combustion chambers to match the 84mm bore of the CR-V block. I would got with either a B16 or GS-R head and have Portflow work the combustion chambers to match up with the 84mm bore. This would be cheaper than buying a more expensive ITR head and then having it worked on by Portflow.

The B20 will have more torque than an ITR swap built with all the same parts with the exception of the block of course. The B20 will also be more expensive to build right but the output will be greater (all things being equal except the block).

Good luck.

-kenji

 

the CTR gets the better intake cam. therefor, its a little better. i also heard that it flows better to due to the tall combustion chamber.

everyone and their mom has ls/vtec. now people are selling them and getting stock vtec motors. (if they dont blow them first.)

 

You are right about the intake cam being slightly different and better.

But, the heads (CTR and ITR) are of the same PR3 cast and both are hand ported at the factory. They are identical heads.

-kenji

 

oh. thanx for the info kenji.

 

I have a complete B18C5 in my DA-6 and I am considering an SIR2 head and B20 Block for a project motor.

 

what happens if the head is not spot faced?

 

I heard that you didn't have to get the head machined to match the bore on the block. Is this true and if not then WHY? I would think you would be alright if you used the b20 head gasket.

 

If you don't get the head spot faced to match the bore of the CR-V block it lends itself to detonation. Also spot facing the combustion chambers allows the valves to be deshrouded which enhances flow.

You don't HAVE to do this but it is very beneficial.

Good luck.

-kenji

 

PMI but what is "spot facing"? I'm guessing it's just opening up the diameter of the combustion chamber to fit the B20 bore? If that's the case, yeah I can see where that would leave some room to deshroud the valves.

 

I use the term "spot facing" because could not think of a better term to describe it and T.O.O. used the term in one of his articles.

You are correct. Spot facing is making the combustion chamber the same diameter as the bore.

-kenji

 

CRVTEC Vs B20Z


The VTEC head is not necessary, just look at the power that can be made with higher comp pistons, cams, and bolt ons.

 

the head is not nessisary, but if you want to max out your engine n/a, the vtec head would be a must no? I mean to compete with modified type R hybrids b20-vtec is a must because the horsepower is comparable but with more torque.

I'd say although the b18c5 would be good for n/a power, the cost of the head would be near the price of the whole engine, then I would just say get the whole itr engine because it probably has a longer life. I would consider a b16a head and port it and you will get similar results to the itr head.

PS: does anyone know the life span on the b20/vtec combo? Is it comparable to the life of a vtec motor?


[Modified by CR-VTEC, 3:00 AM 4/2/2002]

 

that first dyno graph I posted where the guy had 174 whp / 152 ft-lbs, when he added a vtec head with itr cams power went to 208 whp / 154 ft-lbs, pretty big increase in power but is it worth the $, might be better off adding a jrsc or turbo.
b20vtec could be reliable and last a long time if properly built, but I think theres no way it would last as long as a stock vtec motor. Plus if you have all that power your probably gonna run the **** out of the engine.

 

vals motor has a built bottom end, kids doing crvtecs are doing them for max power ona low budget. my head has no spot facing and a 100% bone stock block. talk about trendy fads? well 192hp and 142ft lbs of tourqe on a bone stock block with bolt ons and ctr cams this trend will stay.*tuned with a vafc

 

damn, so no clearance issues? do you have a b20b or z?

 

wait im a little slow what was the H,P torque for just the stock b20 with stock block and head?

 

check out B20VTEC.COM for your orginal question, he's running over 200whp w/ a b20/b18c5 combo, as far as spot facing goes it's more of an safety mod (less chance of detonation) and really hasn't shown much of a power increase although i would still recomend it for the foremetioned reason

 

cut soem valve releifs so there were to clearance inssues.

 

thanks people... really appreciate it.

 

Check out http://www.crvtec.com. Anything you want to know about building a B20/VTEC

 

In my opinion, if u got the money for a good condition type r motor, get it. Its hard to match OEM reliability and longevity(spelling?). plus the motor is already built and u just drop da biotch in. dont have to wait for it to built.