Achieving 22ft lbs with 140* turn on rocker bolt
#1
Teching In
Thread Starter
Join Date: Nov 2010
Location: Jacksonville FL
Posts: 35
Likes: 0
Received 0 Likes
on
0 Posts
Achieving 22ft lbs with 140* turn on rocker bolt
Crank at TDC
stock 317 head w/ upgraded springs
.051 MLS gasket
EPS 226/234 cam w/ 7.425 push rod, new LS-7 lifters
set rocker to touch valve tip without play then begin to measure how far it takes to reach 22ft lb.
not sure I even have a problem, but most threads/posts I ve searched need more than just under 1/2 turn to get the 22ft lb torque required.
Is there a problem?
thanks
stock 317 head w/ upgraded springs
.051 MLS gasket
EPS 226/234 cam w/ 7.425 push rod, new LS-7 lifters
set rocker to touch valve tip without play then begin to measure how far it takes to reach 22ft lb.
not sure I even have a problem, but most threads/posts I ve searched need more than just under 1/2 turn to get the 22ft lb torque required.
Is there a problem?
thanks
#4
Teching In
Thread Starter
Join Date: Nov 2010
Location: Jacksonville FL
Posts: 35
Likes: 0
Received 0 Likes
on
0 Posts
what a person calls zero lash can make a big difference, according to how much play is zero to me vs another, or how much force is used to before the push rod no long rotates.
if I back the bolt out to where the rocker is touching with out "free play", (rocker bolt all the way down but not snug) I can get about 1 1/2 to almost 2 turns to 22ft lbs.
Using the method in the 6.0 manual, I noticed in this effort is that the no.1 intake lifter does not compress as easy as the no.1 exhaust. No. 3 intake is the same as no.1. this concerns me also.
if I back the bolt out to where the rocker is touching with out "free play", (rocker bolt all the way down but not snug) I can get about 1 1/2 to almost 2 turns to 22ft lbs.
Using the method in the 6.0 manual, I noticed in this effort is that the no.1 intake lifter does not compress as easy as the no.1 exhaust. No. 3 intake is the same as no.1. this concerns me also.
#7
Crank at TDC
stock 317 head w/ upgraded springs
.051 MLS gasket
EPS 226/234 cam w/ 7.425 push rod, new LS-7 lifters
set rocker to touch valve tip without play then begin to measure how far it takes to reach 22ft lb.
not sure I even have a problem, but most threads/posts I ve searched need more than just under 1/2 turn to get the 22ft lb torque required.
Is there a problem?
thanks
stock 317 head w/ upgraded springs
.051 MLS gasket
EPS 226/234 cam w/ 7.425 push rod, new LS-7 lifters
set rocker to touch valve tip without play then begin to measure how far it takes to reach 22ft lb.
not sure I even have a problem, but most threads/posts I ve searched need more than just under 1/2 turn to get the 22ft lb torque required.
Is there a problem?
thanks
Hmmm..Most threads I see says to measure for pushrods.
Thats 1/4" this...1/4 that....is just a crap shoot!. Get the tool, measure.
Trending Topics
#9
8 Second Club
iTrader: (16)
Rocker Bolts have a 1.25 pitch
which means 1 full turn = 0.0492 preload
Ideal preload is actually somewhere between .020 and .040
so you are at roughly .020
which is fine.....
if you are worried about it, then you can buy a shorter pushrod
this is also assuming you are at a point on the cam where the valve would be closed
which means 1 full turn = 0.0492 preload
Ideal preload is actually somewhere between .020 and .040
so you are at roughly .020
which is fine.....
if you are worried about it, then you can buy a shorter pushrod
this is also assuming you are at a point on the cam where the valve would be closed
#10
.050-.080"....Some say .100"
#15
8 Second Club
iTrader: (16)
materials its made of, shape of the lobe
you can cause a lifter to basically collapse partially because of the aggressive lobes, which means you need extra travel to allow for that lobe and the new faster rate of travel...
put in a good lifter, and you dont have to worry about that as much
from a few of the cam grinders....optimum around .030
the ranges they say to be within that are still ok..
Cam Motion says .020~.060
Comp Cams says .020~.070
Lunati says .020~.060
most pro level engine builder will tell you .020~.040
they say this for both stability and cam lobe life
you can cause a lifter to basically collapse partially because of the aggressive lobes, which means you need extra travel to allow for that lobe and the new faster rate of travel...
put in a good lifter, and you dont have to worry about that as much
from a few of the cam grinders....optimum around .030
the ranges they say to be within that are still ok..
Cam Motion says .020~.060
Comp Cams says .020~.070
Lunati says .020~.060
most pro level engine builder will tell you .020~.040
they say this for both stability and cam lobe life
#16
materials its made of, shape of the lobe
you can cause a lifter to basically collapse partially because of the aggressive lobes, which means you need extra travel to allow for that lobe and the new faster rate of travel...
put in a good lifter, and you dont have to worry about that as much
from a few of the cam grinders....optimum around .030
the ranges they say to be within that are still ok..
Cam Motion says .020~.060
Comp Cams says .020~.070
Lunati says .020~.060
most pro level engine builder will tell you .020~.040
they say this for both stability and cam lobe life
you can cause a lifter to basically collapse partially because of the aggressive lobes, which means you need extra travel to allow for that lobe and the new faster rate of travel...
put in a good lifter, and you dont have to worry about that as much
from a few of the cam grinders....optimum around .030
the ranges they say to be within that are still ok..
Cam Motion says .020~.060
Comp Cams says .020~.070
Lunati says .020~.060
most pro level engine builder will tell you .020~.040
they say this for both stability and cam lobe life
#18
12 Second Club
iTrader: (4)
I use the eps 226-230 cam. 7.4 pr where to short. Noisy as hell. 7.425 made it quiet. This is on stock lifters. I gettin ready to change lifters to ls7 because one of my stock ones failed. I don't know what the preload would be for a ls7 lifter because their not in yet.
#20
TECH Addict
iTrader: (2)
http://www.compcams.com/v002/Pages/4...icVsMechanical
Says .020~.070 for hydraulic
Also says 1/4 to 3/4 turn
Says .020~.070 for hydraulic
Also says 1/4 to 3/4 turn