they share somewhat similar specs, but the advertised duration for both cams are measure differently.
which cams have more duration/ are bigger?

i'm just going to assume the bigger one has more potential for power since both profiles are proven to make power

 

I understand what your saying by similar specifications, but the BC4 are in a entirely different region of power potential compared to the skunk2 stage2.

 

not from what i've seen.

 

DonF had this to say:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">Why would they do that? The bc-4 vtec lobes are sk stg2s , the ex lobe is a Toda C on the primarys. Or atleast that is what my dial indictor said when I degreed them. The Skunk Pro 3 has more duration than either @ .040 so I would guess it would be a new grind.</TD></TR></TABLE>
I would say talk to DonF or Tbone to get the skinny.

 

i would also like to know the answer, to this man's question. i'm trying to pick between these two cams, as we speak

 

The BC4s will have more mid range but the same top end, if the vtec lobes are the same as DONF states. So the BC4s will have more area under the curve.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EVOL &raquo;</TD></TR><TR><TD CLASS="quote">not from what i've seen.</TD></TR></TABLE>

have you tried the comparison yourself on a particular engine combo? what setup did you see this on whether the 2 cam grinds yield a similar curve or not?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JerseySiPOS &raquo;</TD></TR><TR><TD CLASS="quote">

have you tried the comparison yourself on a particular engine combo? what setup did you see this on whether the 2 cam grinds yield a similar curve or not? </TD></TR></TABLE>

uhhhhhhhhhhhh, if i tried myself, i wouldn't have started this thread.

there was a dyno comparison between the bc3+'s and the bc4's, with the bc4's making almost identical midrange but with a whole lot of power in the upper rpm region. skunk2 stage2 has often been said to have an identical grind as the jun 3, and there have been plenty of dyno's of stage2 cams on various setups showing decent midrange and good top end. but i have yet to see a skunk2 stg2 versus bc4.

 

Not really sure if this counts, but Tbone did a dyno pull with the BC4's versus the S2S3's and the BC's KILLED the skunks. I am under the assumption that the S2S2's wouldn't make as much power as the stage 3's......so maybe this answers your question??

 

the BC4's are the way to go. better mid and top end.

 

will they last as long though?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slo blue &raquo;</TD></TR><TR><TD CLASS="quote">the BC4's are the way to go. better mid and top end.</TD></TR></TABLE>
actually i've got confirmation that the bc4's will make more midrange/low-end, and the same high end.

thanks donf

 

I agree that the BC4's are the way to go. Not only do they have more low/mid power and the same top end hp, but since the transition between the low cam and the high cam is not as dramatic and the s2s2, the bc4 will also have less valvetrain wear which the skunks are known for.

 

I noticed that a lot of people are saying the BC4 have the same top end as the skunk2 stage2, but didn't Tbone's dyno make it clear that the BC4 had way more top end then the skunk2 stage2. Does anyone have the measurements of the two different cams where comparing?

 

Well on Tbone's graph he compared the BC4's to S2S3's and the BC's SMOKED them in every rpm range. It seriously made the skunks look like garbage

 

skunk2stage2 is a totally different cam than their stage 3.

 

Yeha I realize that, but wouldn't you think that in a big 2.+ liter motor with 13.6 compression that the stage 3 would make more power than the stage 2?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by clean rice &raquo;</TD></TR><TR><TD CLASS="quote">Yeha I realize that, but wouldn't you think that in a big 2.+ liter motor with 13.6 compression that the stage 3 would make more power than the stage 2?</TD></TR></TABLE>
no.

 

will portflow valvesprings work with BC4? Also, what time of comprssion is recommended for BC4?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EVOL &raquo;</TD></TR><TR><TD CLASS="quote">no.</TD></TR></TABLE>

Explain.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by clean rice &raquo;</TD></TR><TR><TD CLASS="quote">

Explain.</TD></TR></TABLE>

ask tbone.

 

Nice explanation. If the S2S2's would make more power in Tbone's motor, then why would he run S2S3's over them??? He ran the S2S3's in his car, then tested the BC4's and they blew them away. So again, explain.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EVOL &raquo;</TD></TR><TR><TD CLASS="quote">

i'm just going to assume the bigger one has more potential for power since both profiles are proven to make power
</TD></TR></TABLE>

the BC4's have more duration than the S2S2's, take your own advice........

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by clean rice &raquo;</TD></TR><TR><TD CLASS="quote">Nice explanation</TD></TR></TABLE>

explain why you think skunk2 stg3 cams would make more power than their stage 2?? do you know their specs??
what's your explaination: higher stage = more power?
i've seen dyno's where skunk2 stg3's get killed by other cams that have been beaten by skunk2 stg2's.

i said ask tbone didn't i? why, because he has personal experience. so go ask someone who can give you your "nice explaination." go ask tbone. thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by clean rice &raquo;</TD></TR><TR><TD CLASS="quote">

the BC4's have more duration than the S2S2's, take your own advice........</TD></TR></TABLE>

what? more ADVERTISED DURATION? bc's measure their **** at 1mm, skunk2 at 0. that's why i started this thread. so i can get a confirmation and i got that. and more duration doesn't automatically equate to more power.