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Old 02-23-2010, 06:15 PM
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rocker question

what kind of performance increase can you expect with roller rockers vs stock rockers

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Old 02-23-2010, 06:28 PM
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Quote:
Originally Posted by dmaddox6
what kind of performance increase can you expect with roller rockers vs stock rockers
ZERO that is how much. It along with many other things you may start to actually feel a difference. But to bolt on rollers and expect to not be able to hold onto the steering wheel for all the power......... you just won't feel it.

Most mods are like this, something like lower gears in the rear end, an intake and carb change, a cam change, something like that you can feel it but just the roller rockers, not on your life. NOW, if those rollers came with a different ratio than the stockers, then you "could" be able to feel "something" but it isn't going to be earth shattering.

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Old 02-25-2010, 08:07 AM
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In theory, there should be less friction in the valvetrain, resulting in higher RPMs....but the rest of the stuff (springs, cam, lifters etc) must be able to rev higher too.
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Old 02-25-2010, 08:50 AM
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Quote:
Originally Posted by poncho62
In theory, there should be less friction in the valvetrain, resulting in higher RPMs....but the rest of the stuff (springs, cam, lifters etc) must be able to rev higher too.
I totally agree with poncho, you want all the performance you can get, Then you have to have the combo of everything in sinc, But just changing the rockers won't hurt but not a performance gain if everything else is not there. JMO


Cole
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Old 02-25-2010, 10:23 AM
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A roller tip will get you nada. The roller tip (according to a respected member here) was said to need to be a HUGE diameter (relatively speaking), to replicate the radius of the OEM rocker.

A roller trunnion and tip (can't get the trunnion w/o the tip, except for some net lash OEM apps) will be less friction, heat and less destruction of the oil being "mashed" by the pivot ball/rocker interface- IF your engine has this set-up.

I think a big asset is the aftermarket roller rocker will have a more accurate ratio than the stamped OEM rockers- stamped rockers that are said to be off by as much as 0.2:1 or more on a 1.5:1 nominal ratio!

There is a place where roller rockers become necessary. High lift cams w/high spring pressure will kill pivot ball rockers, so roller rockers (or shaft mounted) are used.

In cases where the oil has been restricted to the top end, they're easier to keep lubed enough to keep from failing than stamped-type pivot ball rockers.

There are roller rockers that have "quick-lift"- designed to alter the opening and closing speeds of the valves.

Kind of off topic, but there are several other schemes used by the OM's to mount the rocker arms- pedestal mounted and shaft mounted to name two.

While shaft mounted rockers can (on some aftermarket heads, at least) be converted to stud mounted (like a SB/BBC, pre-net lash), this would be considered going backwards, IMHO.

All that said, there are a LOT of hard-running engines out on the streets using stamped steel rockers.

Are you dealing w/an 'older' Chevy?
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Old 02-25-2010, 05:38 PM
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rockers

thanks for the info...yeah its a mid 70's block.....just a messing around type motor ..just to play with....i've always use just the oem stamped rockers in the past but was curious about the rollers.... the little motors got a big crane cam in ... the lift i believe is around .514..... i built the motor to sound good and it does...i've gotten so old i'm more concerned about stopping than sheer speed
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Old 02-25-2010, 06:27 PM
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Kinda like peaches and pears, but I swapped a set of 1.6 ratio full rollers and a K&N filter with the filter top onto my otherwise stock 93 S10 4.3, no other changes, and it dropped from 16.21 ET to a 15.71. The stock cam in these little motors really sucks though.
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Old 02-25-2010, 06:41 PM
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Quote:
Originally Posted by Rickracer
Kinda like peaches and pears, but I swapped a set of 1.6 ratio full rollers and a K&N filter with the filter top onto my otherwise stock 93 S10 4.3, no other changes, and it dropped from 16.21 ET to a 15.71. The stock cam in these little motors really sucks though.
A half second is nothing to sneeze at! How much HP does that equate to?

I wonder how much came from the 1.6 and how much from the K&N?
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Old 02-25-2010, 06:53 PM
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I swapped the K&N by itself on an outing before that trip to the track and it made no difference by itself. I could make a couple passes with the stock filter then a couple with the K&N now to see if it makes a difference with the roller rockers,
Might be a bit before I take it back to the track though, at least to run, it will probably be towing a 10 second Vega next time it goes to the track,
I only run it to be racing something when our V8 S10 group gets together on Funday Sundays at Speed World, usually I run my CBR 600F2. Next up will be the Vega, then my truck gets a 400+hp Vortec head 360.

Last edited by Rickracer; 02-25-2010 at 06:59 PM.
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Old 02-25-2010, 06:57 PM
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You don't still have to go through St. Cloud to HW 15 to get to the track do you? I'm thinking that the Green way or whatever it's called might be a better hook-up?
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Old 02-25-2010, 07:02 PM
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I go 417 (Greenway) to the 408 (East-West) to Colonial. It used to take like an hour and a half to get to the track from Kissimmee, now if traffic is light, I can make it in about 40 minutes, but it's about $3.50 in tolls each way.
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