Roller rocker question

**Johns00Z28** · 09-05-2007, 10:17 PM

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?

**Danger731** · 09-05-2007, 10:18 PM

most are skepticle of thier claims

**Johns00Z28** · 09-05-2007, 10:28 PM

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?

**nhraformula** · 09-06-2007, 05:48 AM

youll gain some h.p, not much. maybe 5 rwhp

**Johns00Z28** · 09-06-2007, 06:50 AM

So pretty much the money could be better spent doing another mod?

**FuriousGeorge** · 09-06-2007, 07:18 AM

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

**JonB** · 09-06-2007, 08:39 AM

Originally Posted by Johns00Z28

So pretty much the money could be better spent doing another mod?

Exactly right.

**Spaz** · 09-06-2007, 08:57 AM

Originally Posted by Johns00Z28

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...

**Johns00Z28** · 09-06-2007, 01:49 PM

Well I don't have anything done at the moment. Just looking for a few mods I can start with.

**mrr23** · 09-06-2007, 03:32 PM

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.

**Johns00Z28** · 09-06-2007, 05:15 PM

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

**mrr23** · 09-06-2007, 05:16 PM

lid, filter, MAF ends, bassani headers and catted y-pipe, borla exhaust. not too hard to do.

**nhraformula** · 09-06-2007, 05:22 PM

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.

**Johns00Z28** · 09-06-2007, 05:27 PM

Originally Posted by nhraformula

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?

**mrr23** · 09-06-2007, 06:03 PM

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

**mrr23** · 09-06-2007, 06:08 PM

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.

**nhraformula** · 09-06-2007, 06:53 PM

Originally Posted by Johns00Z28

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.

**nhraformula** · 09-06-2007, 06:54 PM

Originally Posted by mrr23

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.

**nhraformula** · 09-06-2007, 07:00 PM

Originally Posted by mrr23

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.

**mrr23** · 09-08-2007, 02:09 PM

Originally Posted by nhraformula

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.