Lifter pre-load?
TECH Regular
Joined: Jul 2011
Posts: 452
Likes: 2
The lifter pre-load is really not a constant "0.078" per turn". It depends on now many turns it ends up being to get to 22 ft-lbs since the last 1/3 turn of the rocker bolt doesn't add any more pre-load to the lifter.
https://ls1tech.com/forums/14943159-post36.html
To summarize:
Rocker Bolt.....Lifter
Turns .......... Preload .... Preload per Bolt Turn
1 .................0.052 .......0.052
1-1/4 ...........0.071 ...... 0.057
1-1/3 ...........0.078 ...... 0.059
1-1/2 ...........0.091 ...... 0.061
1-2/3 ...........0.104 ...... 0.062
1-3/4 ...........0.110 ...... 0.063
2 .................0.130 ...... 0.065
https://ls1tech.com/forums/14943159-post36.html
To summarize:
Rocker Bolt.....Lifter
Turns .......... Preload .... Preload per Bolt Turn
1 .................0.052 .......0.052
1-1/4 ...........0.071 ...... 0.057
1-1/3 ...........0.078 ...... 0.059
1-1/2 ...........0.091 ...... 0.061
1-2/3 ...........0.104 ...... 0.062
1-3/4 ...........0.110 ...... 0.063
2 .................0.130 ...... 0.065
Last edited by ZeeOSix; Mar 6, 2012 at 01:00 PM.
Right, that's my spreadsheet. So in the right-hand column you're factoring in the 1/3 turn to 22 ft.lbs. I suppose you could say it's .078" per turn before the rocker bolt gets tight.
TECH Regular
Joined: Jul 2011
Posts: 452
Likes: 2
The right hand column in my table is nothing more than the resulting lifter pre-load column divided by the number of rocker arm bolt turns.
This shows that the amount of lifter pre-load is not a constant based on bolt turns, but is dependent on how many bolt turns it takes to get to 22 ft-lbs on the rocker bolt. As the lifter pre-load increased, more pre-load per turn is achieved because the constant 1/3 turn factor becomes a smaller part of the equation.
That's true. I changed the column heading to help clarify.
Last edited by ZeeOSix; Mar 6, 2012 at 01:02 PM.
