Ok so everyone relax one second before you start flaming - here is the situation.

Car will not be street driven so I could care less about drivability.
My plans for this upcoming season is to test out how much power i can pull out of the stock jdm h22 block. Hence this question.
I already have New intake mani, bigger TB, Ericks racing header, the head will be going out to RLZ as well. I understand that obviously these cams will benefit more from higher compression but the RLZ head should be more than enough (flow wise). Plans down the road will include a built block but for now - it is what it is.

I had plans on running athe RM h24s or sk2 pro2s but I have been hearing more and more about the crane cams and someone very reputable to me is telling me to look harder into them.

What are everyone's thoughts ?

 

this is just my opinion...

based upon the specs of the pro series cams (most aggressive profiles on the open market with data backing them up), high lift/low durations, i think you are going to be hard pressed to "max out" the stock bottom end without having big negatives being visibly seen on the dyno. With those specs, each cycle is going to need to pack a punch in order for the cams to do their job. But then again this is using the rocker setup which isnt as "efficient" as a roller rocker configuration so I cant really give you any useful opinion as there isnt much data on the roller rocker h22 setups.

what are the specs of the cranes?

 

those "aggressive" cams will effectively lower the static compression quite a bit

 

Do you already have the rockers and cams? I have a set, brand new, never installed that I'd like to sell. I was planning to move up to H1 in HondaChallenge where these would be legal, but I have decided to stay in H2 where the Prelude will be more competitive.

If you're interested, let me know. Brand new the cams and rockers run over $2k. I'd be willing to sell my set for $1450 + shipping to you. There are plenty of people who know me if you need references (98vtec is one of them). I can also send pictures if you like.

BTW, they are the NA spec cams.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">this is just my opinion...

based upon the specs of the pro series cams (most aggressive profiles on the open market with data backing them up), high lift/low durations, i think you are going to be hard pressed to "max out" the stock bottom end without having big negatives being visibly seen on the dyno. With those specs, each cycle is going to need to pack a punch in order for the cams to do their job. But then again this is using the rocker setup which isnt as "efficient" as a roller rocker configuration so I cant really give you any useful opinion as there isnt much data on the roller rocker h22 setups.

what are the specs of the cranes?</TD></TR></TABLE>

When you say negative effect on the dyno you mean like loss of power and torque down low, or weaker curve, or . . . sorry - just trying to gather all info i can

Specs are -
Advertised Duration Intake/Exhaust 266 / 260
Duration @ .050 Intake/Exhaust 242/236
Lobe Separation 104
Gross Lift 472/457 (12.00/11.62)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quicksilver1689 &raquo;</TD></TR><TR><TD CLASS="quote">those "aggressive" cams will effectively lower the static compression quite a bit</TD></TR></TABLE>

again forgive me for lack of information - you are saying this because the profiles are so "aggressive" that when the motor cycles it will lose static compression. Now when you say "aggressive" are you talking about any of the cams i have listed or the crane's specifically.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">Do you already have the rockers and cams? I have a set, brand new, never installed that I'd like to sell. I was planning to move up to H1 in HondaChallenge where these would be legal, but I have decided to stay in H2 where the Prelude will be more competitive.

If you're interested, let me know. Brand new the cams and rockers run over $2k. I'd be willing to sell my set for $1450 + shipping to you. There are plenty of people who know me if you need references (98vtec is one of them). I can also send pictures if you like.

BTW, they are the NA spec cams. </TD></TR></TABLE>

I shall keep that in mind- thank you

 

Race Only Roller Cam. Pro stock. All motor. Naturally aspirated pro class modifications needed. Minimum compression ratio 12.5:1

i would imagine that the engine is going to be a dog under racing conditions solely based on the amount of overlap these cams likely possess. i dont know how to word it but i am going to try. Its almost as if the engine is fighting to keep up with the amount of air that your cams and head are going to be able to flow. Once the cams are factored into the compression, its likely that the compression will drop considerably, how much? I dont know, but the fact that the compression will drop is something to consider.

How much more efficient are rollers compared to the standard rocker setup? What frictional losses from the rocker setup are regained from having rollers? What about the weight of the cams themselves? a reduction in rotational mass will surely help the negative effects.

once again, all this is just my opinion. would love for someone with real experience with roller rockers to chime in and shed some light.

btw, I'm all for you doing this and shelling out the information back

 

they have several grinds available now, even to some really big stuff. they have worked great for me.

 

on a stock block?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">on a stock block?</TD></TR></TABLE>

far from it, but im commenting on the quality of the system, not on his goals and motives