The motor setup consist of b18c1 with jdm itr pistons, compression is at around 11.3:1-11.5:1 Omni valvetrain, 64mm overboard tb, skunk2IM, aem shortram intake, jdmitr header, 2.5 inch exhaust, high flow cat.

I really had my heart set on the Jun 3 cams, but i think i'm priced out of them. I wanted them because of the easy idle characteristic, and from all the positive dyno graphs i've seem from them. But i have looked forward to alternatives such as the blox b/skunk2 stage2s or the blox c's (supposely jun3 copys), or maybe bc3s.

My questions are, are the blox c's really the exact same copy as the jun3s? I've notice that the blox c's do have the wider (in width/contact area) primary/secondarys as the jun3s. But then I read that the blox b and blox c vtec lobes are exactly the same. How can that be, when skunk2 stage 2 vtec specs were at slightly higher lift less duration, while the jun3s were a little lower lift but with slight more duration.

Jun Type 3 12.0 mm 265.3 @ 1mm 11.5 mm 265.3 @ 1mm

Skunk2 stage 2 12.3 mm 266 @ 1mm 11.8 mm 262 @ 1mm

Anyways i'm not too worried about that. The real reason why I wanted the jun3 is because of the lower lift compared to skunk2 or other cams, but it makes power just as good, which = less valvetrain wear. I want the smaller primarys/secondarys because I don't want high valvetrain/timing belt wear caused by the bigger primary/secondary lobed cams, because my car is daily driver, and will spend 90% of miles below vtec, plus nice easy idle and fuel economy. Another reason is, having the primarys/secondaries as close to stock, that would allow me a better chance to pass smog. (I'm trying not to pay for illegal smog or swapping cams just for smog) I will probably try to tune the car for smog inspection. Don't get me wrong I would love the bigger lobes primary/secondary for better mid-range power, but the cost is not worthed it to me.

Does anyone know if the primarys/secondarys of the jun3 are bigger than stock cams or same size? My main question is, which cam has the smaller primary/secondary(as in lift/duration) in the skunk2stage2, blox b or the blox c's.? Sorry to make everything complicated, I know i can use go with stage 1 cams and disregard all the problems about the size of the primary/secondary lobes. But I was also further confused reading on about skunk2 stage 3 having smaller primaries than skunk2stage 2's. I would get the skunk2 stage 3, but I think the vtec lobes would be too aggressive for my setup.

Another tech question is why did honda make the bseries vtec cams have a wider (contact area in width) and bigger (lift/duration) primary lobes, combined with a narrow (contact area in width) along with smaller lift duration secondary lobes? So basically it means in the combustion chamber in one cylinder, below vtec two intake/exhaust valves will open a little less then the other 2 intake/exhaust valve. Why couldn't they be the same size? Why would the secondary lobe have a narrow contact area, but the primary is wider? Maybe because it puts less strain/resistance on the valvetrain? I hope you guys understand what i'm talking about and can clear it up for me. I do need to get my cams soon, please help me narrow down my selection. I will be getting cam gears along with it, probably crome for tuning, and may upgrade injectors/fuel pump if needed. Thanks

 

 

bumper

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HKSone &raquo;</TD></TR><TR><TD CLASS="quote">
Another tech question is why did honda make the bseries vtec cams have a wider (contact area in width) and bigger (lift/duration) primary lobes, combined with a narrow (contact area in width) along with smaller lift duration secondary lobes? So basically it means in the combustion chamber in one cylinder, below vtec two intake/exhaust valves will open a little less then the other 2 intake/exhaust valve. Why couldn't they be the same size? Why would the secondary lobe have a narrow contact area, but the primary is wider? Maybe because it puts less strain/resistance on the valvetrain? </TD></TR></TABLE>

Sorry I don't know crap about n/a cams, but the reason the two valve openings are staggered on the same side below VTEC is to promote swirl in the chamber

 

thanks i guess its good for only low-end power then, but not high-end.

 

i have the primary lobe size of the s2s2 cams if you want me to post that

and the bc3 intake lobs is actually smaller than a itr cams

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkankyEJ7 &raquo;</TD></TR><TR><TD CLASS="quote">i have the primary lobe size of the s2s2 cams if you want me to post that

and the bc3 intake lobs is actually smaller than a itr cams</TD></TR></TABLE>post them up please.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gsrious &raquo;</TD></TR><TR><TD CLASS="quote">post them up please.</TD></TR></TABLE>

ask and woe ye shall recieveth upon thee

the PRIMARY lobe specs for all skunk2 b vtec
cams
tage 1 intake 203-8.1 exhaust 194-7.2
stage 2 intake 215-9.3 exhaust 216-9.1
stage 3 intake 187-8.1 exhaust 186-7.6

pro 1 intake 210-9.6 exhaust 220-9.6
pro 2 intake 219-10.4 exhaust 220-9.6
pro 3 intake 219-10.4 exhaust 220-9.6

 

skunk2 stage 3 should be able to pass smog then!

thanks for the specs, anyone have the primary lobe specs for the jun3 or blox c's??

 

eh i dunno about stage 3 passing smog but im pretty sure stage 1 could since ints carb legal exempt baller status

 

up for jun3/blox c primary lobe specs!