There has been a fair amount of talk recently about the BC3+ camshafts and the BC4 camshafts. Most of the topics which have been opened regarding these camshafts ask which to use for a specific application. Obviously, the unanimous advice has been, the higher your compression, the more you should step up to the BC4. There was a specific thread which asked which camshafts would be best for an internally stock ITR, and everyone leaned towards the BC3+. Buddy Club has mentioned that the JDM ITR has barely enough compression to manage BC4s.

Long question short, I want to know if anyone has installed BC4s in an internally stock ITR? If so, what kind of numbers is the setup producing? More importantly than peak numbers, was there a sacrifice under the curve due to the 11.1:1 compression? If I went after these camshafts, they would go in with Toda or BC springs/retainers, RC310 injectors, Hondata S100, Sk2 cam gears, and a light port job with port match to the manifold. The reason why I am interested is not because I want to overcam my engine. The engine will eventually be sleeved 84mm to a 2.0L with CP 12:1 pistons, eagle rods, and blueprint/balance and I don't want to have to buy 2 sets of camshafts. Any recommendations or feedback would be appreciated. If no one has information about BC4s in a stock ITR, hopefully Buddy Club can chime in with some insight. Thanks!!

 

bump cuz i want to know too

 

My thought is that u should go bc4. same thing up intill like around 7 where 4s take over top end. I bought bc3+ for a gsr mildly built and didnt even drive on em cuase motor blew on dyno. and now with new setup im runnin 4s with 11.5 compression. I think u should just go 4s.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sheepey &raquo;</TD></TR><TR><TD CLASS="quote">My thought is that u should go bc4. same thing up intill like around 7 where 4s take over top end. I bought bc3+ for a gsr mildly built and didnt even drive on em cuase motor blew on dyno. and now with new setup im runnin 4s with 11.5 compression. I think u should just go 4s.</TD></TR></TABLE>

That is what I am leaning towards. Let me know what your new setup is producing when you get it together.

Bump for more feedback from all you All Motor heads!!

 

bump

 

Yea im in the process of a JDM ITR build right now. Floated the valves in the motor so I've pulled the head purchased Skunk valve springs and titanium retainers, Mugen head gasket, hondata IM gasket, and soon the BC4 cams. Hopefully the head gasket will raise my compression up to around 11.5:1 like Mugen claims it will. Im going for the BC4 cams

 

If this build is going to be finidhed soon, please share your numbers with the rest of us.

Does anyone have an engine with similar compression 11.1-11.5:1 with the BC4s already built and running?

 

 

We installed the BC4's in a B16B w ITB's and got horrible numbers. I also sold another set to a customer and the cam broke where the distributor fits into the cam. Im not going to hate on BC but they arent going to warranty it! I am curious to see if anyone else has had these types of problems. I dont remeber exactly what the numbers were because it has been a few wekks but we didnt even break 170 . We havent messed with it since but I think we are going to put the CTR cams back in and see what happens. Just my to pennies

 

get some Toda B's

 

Thanks for the feedback. Bump again, anyone else have BC4's?

 

if you are for sure going through with an engine build, then why not have bc4's. although if you arent too sure if the build will happen, play is safe and go with something less dramatic. I'd hate to see someone with stock internals and crazy cams, ad sadly Ive seen it a few times.

Rich

 

i'd go 4s with a built motor . they probably won't work that great in a stock motor

 

im gonna use the BC4's in my 2020cc, 12.5 compression motor with a ported head.

According to the cams specs that i have, the BC4s and Skunk2 stage 2's have the same EXACT vtec lobe. Im almost sure

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JerseySiPOS &raquo;</TD></TR><TR><TD CLASS="quote">im gonna use the BC4's in my 2020cc, 12.5 compression motor with a ported head.

According to the cams specs that i have, the BC4s and Skunk2 stage 2's have the same EXACT vtec lobe. Im almost sure</TD></TR></TABLE>
Its not exactly the same dur. i think the BC have like5 or 6 more degrees but the same lift, im looking too on those cams for my B16 it has CTR pistons,P&P head,Flat SS valves,Ferrea Valve springs and retainers,5 angle valve job, STR cam gears, DIY ITB's 48mm, vibrant J 4-2-1 header, currently running CTR cams and i would like to run those BC4 but i dont know if i will have valve to piston clereance issues.
P.D.:Excuse me if i misspell something.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DarkSolPR &raquo;</TD></TR><TR><TD CLASS="quote">
Its not exactly the same dur. i think the BC have like5 or 6 more degrees but the same lift</TD></TR></TABLE>

DonF and a couple ppl can confirm that they are they are the exact same Hi lobes. BC just doesn't advertise the duration at 1mm, so that's why you see 306/302, somewhere around there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 626CivicSi &raquo;</TD></TR><TR><TD CLASS="quote">get some Toda B's </TD></TR></TABLE> Toda B's for sale here!