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Thread: any one running roller rockers?
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07-31-2007, 09:55 AM #1
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- Nov 1999
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[]D [] []V[] []D- 1999 trans am
any one running roller rockers?
how do you like them? why type are you running? how noisey are they? any noticeable difference in perf?
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07-31-2007, 06:05 PM #2
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
Cold Air Intake, Muffler Delete, Vinci High Performance Dual Valve Springs, Hardened Pushrods, Yella Terra 1.85 Rockers, Some Hydropdipped Stuff, Strut Tower Brace, Some SS Badges, boost/vacuum gauge, fuel pressure gauge, some checkered stripes, drilled/slotted rotors, ZL1addons Stealth wickerbill, Ruxifey LED side markers
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08-01-2007, 04:33 AM #3
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08-01-2007, 09:05 AM #4
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Mystic Teal- 99 Trans Am & 01 CBR 929
A buddy of mine is running the 1.8 roller rockers from SLP and his performance increase is definatly noticeable on the top end.
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08-01-2007, 09:10 AM #5
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08-01-2007, 02:27 PM #6
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08-01-2007, 02:30 PM #7
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!
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08-01-2007, 02:31 PM #8
piston to valve clearance has more to do with duration and ramp rate versus lift.
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08-01-2007, 02:40 PM #9
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08-01-2007, 02:42 PM #10
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08-01-2007, 02:46 PM #11
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?
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08-01-2007, 02:53 PM #12
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- Retired Outlaw Sum Bitch
I use 1.8 Cranes.............mrr23 is dead on with his advise....great upgrade in the rockers....
This is my signature. It is mine. Nobody else has one like it.
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08-01-2007, 03:05 PM #13
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.
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08-01-2007, 03:06 PM #14
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08-07-2010, 05:24 PM #15
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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08-07-2010, 08:38 PM #16
so 1.8's could be used with donkey dick cams like Trex and MS4 and everything would be ok???
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08-07-2010, 08:43 PM #17
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08-07-2010, 08:46 PM #18
rry, that's directed towards mrr23
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08-07-2010, 08:52 PM #19
Last edited by Smittro; 08-09-2010 at 11:51 AM.
Suggestion: If you are particularly irritated by another member's posting habits and are constantly fighting the urge to flame them, you can click on that person's profile, and select "Add to ignore list." This will make that person's posts invisible to you.
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08-07-2010, 08:55 PM #20
Holy thread from the dead batman!
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