Gains from 1.8 rockers
May 22, 2006 | 11:55 PM
#11
Originally Posted by thunder550
I'll throw my opinion on this in here as well. I think the 1.8's were worth it. They are accelerated lift, and you can get higher and quicker lift without slamming the lifters around as much. Just my opinion, and what makes sense to me. It also expands the list of cams you can get, I have a .551 cam and am getting .583 lift. Yes, you can get a cam that gives you .583 lift, but you will be stressing the lifters more. Don't have any idea what that does to longevity, maybe nothing, but it would make sense that less stress on the lifters = longer life....
May 22, 2006 | 11:59 PM
#12
Originally Posted by 99Silver6.0
I have never heard of anyone having any problems with lifters from running fat cams. EVER. Not even guys running the T-Rex!! Valve springs wearing out from the lift yes. But never a lifter problem.
May 23, 2006 | 07:39 AM
#14
Staging Lane
Joined: Jul 2004
Posts: 90
Likes: 0
Over 600 lift no problems with lifters you just need good springs and proper valvetrain geometry and all is good. Proper length pushrod, properly adjusted valves, proper springs presssure and install heights and all is good. A stock lifter will work but an aftermarket piece will always be better.
May 23, 2006 | 03:38 PM
#15
TECH Apprentice
Joined: Dec 2004
Posts: 393
Likes: 0
From: San Antonio
Originally Posted by 99Silver6.0
Plus I say we ditch the search button..... Or at least put some animated mold on it since it never gets used.
sixliterhd: To answer your original question I think you will see a gain of 10 to 20hp with the accelerated lift type rockers and a tune on the stock cam. Maybe mrr23 will chime in here, he dynoed before and after with those rockers on a stock cammed LS1. Here are links to a couple of threads I started regarding using these rockers with an aftermarket cam, some good info in there:
ls1tech 1.8 rocker
pt 1.8 rockers
May 23, 2006 | 11:01 PM
#16
formerly silverbrick (changed 02/17/2013)
iTrader: (5)
Joined: Mar 2006
Posts: 4,525
Likes: 0
From: Pasadena, Tx
Originally Posted by jmproductions
In his defense the search doesn't really work for this subject. For some reason it doesn't recognize the term "1.8". So you have to search for different stuff related to rockers and you end up getting the phone book.
May 23, 2006 | 11:24 PM
#17
if you want them, get 'em. the choice is yours.
you're not going to loft a lifter, bend a pushrod, break a valve spring, spit keepers out the exhaust, or anything like that. the "rocker ratio" thing seems to get beat up alot on the boards, but you what...them little geeky guys with the slide rules in their pockets, who sit around all day integrating and differentiating, filling in the area of that damn sine-wave...you know...GM Engineers...doesn't think there is anything wrong with increased rocker ratios.
look at the BBC. its been running 1.7 ratio longer than some of those here have been alive, and the new LS-7, what does it run...1.8.
go figure...
you're not going to loft a lifter, bend a pushrod, break a valve spring, spit keepers out the exhaust, or anything like that. the "rocker ratio" thing seems to get beat up alot on the boards, but you what...them little geeky guys with the slide rules in their pockets, who sit around all day integrating and differentiating, filling in the area of that damn sine-wave...you know...GM Engineers...doesn't think there is anything wrong with increased rocker ratios.
look at the BBC. its been running 1.7 ratio longer than some of those here have been alive, and the new LS-7, what does it run...1.8.
go figure...
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