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Roller rocker question

This is a discussion on Roller rocker question within the Internal Engine forums, part of the LSx Technical Help Section category; I was looking at these roller rocker arms http://www.granatellimotorsports.com...lerrockers.htm on granatelli's website. They claim 8-11% more hp and 10-15% more ...

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    Make real real sure Johns00Z28's Avatar
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    Roller rocker question

    I was looking at these roller rocker arms http://www.granatellimotorsports.com...lerrockers.htm on granatelli's website. They claim 8-11% more hp and 10-15% more fuel efficiency. Is this total BS or are these valid claims?

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    Senior Member Danger731's Avatar
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    most are skepticle of thier claims

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    Make real real sure Johns00Z28's Avatar
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    Do you know if they give any hp or any help in fuel efficiency? Basically I'm wondering even if they don't make what they claim, would it still be a reasonable upgrade and be worth their price?
    Vote for Pedro.

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    member since may 2000 nhraformula's Avatar
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    youll gain some h.p, not much. maybe 5 rwhp
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

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    Make real real sure Johns00Z28's Avatar
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    So pretty much the money could be better spent doing another mod?

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    seems like they're usually pretty high on their claims...sorta like SLP

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    Senior Member JonB's Avatar
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    Quote Originally Posted by Johns00Z28 View Post
    So pretty much the money could be better spent doing another mod?

    Exactly right.
    05 PBM GTO
    Cold Air Inductions CAI,
    Relocated IAT with omega,
    Slp Predator tune,
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    Sold 01 z28

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by Johns00Z28 View Post
    So pretty much the money could be better spent doing another mod?
    depends on what you have done now... they will give better gains down the road with other mods...

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    Make real real sure Johns00Z28's Avatar
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    Well I don't have anything done at the moment. Just looking for a few mods I can start with.

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    Senior Member mrr23's Avatar
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    if you want rockers that work, then get the vinci/crane accelerated lift kit. used the 1.8 rockers on the wife's car on stock cam and picked up 17 rwhp. the kit is $669.00 through vinci. comes with rockers, posi-locks, guide plates, screw-in-studs, and shorter pushrods.


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    Make real real sure Johns00Z28's Avatar
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    That's a pretty impressive gain! What other mods does she have? Is that a relatively easy swap?

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    Senior Member mrr23's Avatar
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    lid, filter, MAF ends, bassani headers and catted y-pipe, borla exhaust. not too hard to do.

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    member since may 2000 nhraformula's Avatar
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    1.8 rockers will limit what kind of cam a person can get in the future. i advise against it.
    i had 1.85 rockers and sold them when i was about to cam the car.

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    Make real real sure Johns00Z28's Avatar
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    Quote Originally Posted by nhraformula View Post
    1.8 rockers will limit what kind of cam a person can get in the future. i advise against it.
    i had 1.85 rockers and sold them when i was about to cam the car.
    Why would that limit the cam you could use? Would it be more advisable to just upgrade the rockers when you do a cam swap?

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    Senior Member mrr23's Avatar
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    just means don't buy a thunder racing cam. so long as you have proper piston to valve clearance and spring control, going to larger ratio rockers will not limit you in cam choice

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    Senior Member mrr23's Avatar
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    here's some actual dyno and track tested data to ponder over. vinci did a comparison of a comp cam and their cam. Project C5 AFR

    comp cam 224/224 .581.581 (1.7 rockers) 115 LSA vs vinci 055 cam 216/224 .583/.583 (1.8 rockers) 113 LSA

    http://vincihighperformance.com/beck...20tricker.html

    the smaller cam with higher ratio rockers made more overall power. now, which would you rather have? and these cams were tested with the stock torque converter.

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Johns00Z28 View Post
    Why would that limit the cam you could use? Would it be more advisable to just upgrade the rockers when you do a cam swap?
    piston to valve clearance. you cant get moderate and above cams with a 1.8 rocker arm unless you fly cut the piston.

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by mrr23 View Post
    just means don't buy a thunder racing cam. so long as you have proper piston to valve clearance and spring control, going to larger ratio rockers will not limit you in cam choice
    that means you cannot buy alot of proven cams, not just thunder.
    to top it off, thunder doesnt make their own cams, comp cams does.
    Last edited by nhraformula; 09-06-2007 at 08:01 PM.

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by mrr23 View Post
    here's some actual dyno and track tested data to ponder over. vinci did a comparison of a comp cam and their cam. Project C5 AFR

    comp cam 224/224 .581.581 (1.7 rockers) 115 LSA vs vinci 055 cam 216/224 .583/.583 (1.8 rockers) 113 LSA

    http://vincihighperformance.com/beck...20tricker.html

    the smaller cam with higher ratio rockers made more overall power. now, which would you rather have? and these cams were tested with the stock torque converter.
    i cam post dyno graphs of big cams on stock rockers making more power.
    hell, just go to ls1tech.

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    Senior Member mrr23's Avatar
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    Quote Originally Posted by nhraformula View Post
    that means you cannot buy alot of proven cams, not just thunder.
    to top it off, thunder doesnt make their own cams, comp cams does.

    comp grinds thunder's specs for them. just like crane grinds vinci's cams for them.

    just because you haven't heard of them, doesn't mean they are proven.

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