any one running roller rockers?

**Spaz** · 07-31-2007, 09:55 AM

how do you like them? why type are you running? how noisey are they? any noticeable difference in perf?

**mrr23** · 07-31-2007, 06:05 PM

yep. i used the vinci/crane 1.8 accelerated lift rockers in the wife's car.

currently using the crane 1.8 shaft mount rockers in my 408.

very quiet.

dyno from the wife's car with stock cam and stock tune

**Spaz** · 08-01-2007, 04:33 AM

Originally Posted by mrr23

yep. i used the vinci/crane 1.8 accelerated lift rockers in the wife's car.

currently using the crane 1.8 shaft mount rockers in my 408.

very quiet.

dyno from the wife's car with stock cam and stock tune

i seen an add in gmhtp for the scorpion ones... are they worth the price?

**juiced99ws6** · 08-01-2007, 09:05 AM

A buddy of mine is running the 1.8 roller rockers from SLP and his performance increase is definatly noticeable on the top end.

**Spaz** · 08-01-2007, 09:10 AM

Originally Posted by juiced99ws6

A buddy of mine is running the 1.8 roller rockers from SLP and his performance increase is definatly noticeable on the top end.

hmmm... i'd be afraid to go with 1.8 due to me getting a cam later...

**mrr23** · 08-01-2007, 02:27 PM

Originally Posted by Spaz

hmmm... i'd be afraid to go with 1.8 due to me getting a cam later...

why? because of all those claims about not using 1.8 on aggressive lobes? so long as you have piston to valve clearance and proper spring control, no problems will be had.

**secondgearscratch** · 08-01-2007, 02:30 PM

at what kind of lift would that start to be a problem for piston to valve with the 1.8? or does it have to do with duration...

p.s. im stupid.

sorry for the highjack-spaz, i have no idea how to answer your question. i am sorry and i wish i did. i too have been pondering about the scorpion rockers, they look pretty bad ass. i want em-in red!

**mrr23** · 08-01-2007, 02:31 PM

piston to valve clearance has more to do with duration and ramp rate versus lift.

**secondgearscratch** · 08-01-2007, 02:40 PM

Originally Posted by mrr23

piston to valve clearance has more to do with duration and ramp rate versus lift.

youre a saint.

oh yeah that vinci page you linked me to...i gained a VAST understanding just reading. i had no idea about some of that stuff. i thank you again.

**mrr23** · 08-01-2007, 02:42 PM

Originally Posted by secondgearscratch

youre a saint.

oh yeah that vinci page you linked me to...i gained a VAST understanding just reading. i had no idea about some of that stuff. i thank you again.

anytime. it's one of the very few sponsor type sites that have that kind of info readily available.

**secondgearscratch** · 08-01-2007, 02:46 PM

Originally Posted by mrr23

anytime. it's one of the very few sponsor type sites that have that kind of info readily available.

thats pretty true. not alot of them actually explain anything..its all product showcase, which is neither good nor bad, just how it is.

i did just read that 1.8 rockers werent recommended by thunder racing though as i was looking at the cheater cam, which is about the wackiest duration ive seen.....

any ideas why they say to steer clear of the 1.8s most of the time?

**Sarge** · 08-01-2007, 02:53 PM

I use 1.8 Cranes.............mrr23 is dead on with his advise....great upgrade in the rockers....

**mrr23** · 08-01-2007, 03:05 PM

Originally Posted by secondgearscratch

thats pretty true. not alot of them actually explain anything..its all product showcase, which is neither good nor bad, just how it is.

i did just read that 1.8 rockers werent recommended by thunder racing though as i was looking at the cheater cam, which is about the wackiest duration ive seen.....

any ideas why they say to steer clear of the 1.8s most of the time?

got a friend of mine with that cam. it's designed for stock exhaust manifolds, hence the large amount of exhaust duration.

they use a really aggressive ramp on some of their cams. for awhile, there weren't any springs and lifters that could handle the added ramp rate. at least that's the reasoning behind it that i can surmise. yet, people will tell you just to grind it into the cam. i ask, what's the difference? don't really get a useful answer. whether you do it at the cam, or at the rocker, the valve will move the same.

here's my train of thought about using higher ratio rockers. i've bounced it off of a couple people smarter than me, and they seem to agree.

from the cam, you have 4 things the valve spring has to control. the lifter, pushrod, rocker, and the valve itself. using the 'just grind it into the cam' idea will speed up all of those objects. the valve spring doesn't only control the valve, it also has to keep the lifter from 'lofting' off the cam too much and make everything do a 180* direction change. by changing it at the rocker, you haven't changed the speed of the lifter, pushrod or rocker. you only changed it at the valve. the valve spring is doing less work, for the same amount of movement.

also, by going to a larger ratio rocker, it opens the valve easier. after all, it is nothing more than a lever. the downside to using a higher ratio rocker is that it does put more stress on the lifter. i've never had a lifter fail from the rockers.

**mrr23** · 08-01-2007, 03:06 PM

Originally Posted by Sarge

I use 1.8 Cranes.............mrr23 is dead on with his advise....great upgrade in the rockers....

thank you sir.

**jamie williams** · 08-07-2010, 05:24 PM

cAn any one tell me if scorpion rockers are good i keep hearing that they crack . i just spent 380.00 for 1.8 rockers to put on my 2000 trans am and dont want to wast my time puting them on if there just going to crack.

**xmarkx** · 08-07-2010, 08:38 PM

so 1.8's could be used with donkey dick cams like Trex and MS4 and everything would be ok???

**jamie williams** · 08-07-2010, 08:43 PM

Originally Posted by xmarkx

so 1.8's could be used with donkey dick cams like Trex and MS4 and everything would be ok???

what are you talking about?

**xmarkx** · 08-07-2010, 08:46 PM

rry, that's directed towards mrr23

**Smittro** · 08-07-2010, 08:52 PM

Originally Posted by jamie williams

cAn any one tell me if scorpion rockers are good i keep hearing that they crack . i just spent 380.00 for 1.8 rockers to put on my 2000 trans am and dont want to wast my time puting them on if there just going to crack.

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