|
#1
|
|||
|
|||
Question says it all.......how do you adjust the rocker (do you need clearance, or preload and how much, and how to you measure. thanks. Joseph Tonna
|
#2
|
|||
|
|||
pre load
Take hyd. lifters to zero lash and turn 1.5 to 2 turns more.
Joe |
#3
|
|||
|
|||
Thanks!
Will try. Thanks a lot!
|
#4
|
|||
|
|||
I have ran them as little as 1/2 a turn from zero pre load.
|
#5
|
|||
|
|||
Too Much
2 is plenty in my opinion, half to one full turn is enough. Too much and you end up
breaking parts, floating valves etc. Compromise? yep 3/4 of a turn as a rule will do the job. TeRo http://www.paalupaikka.com/racevaliant |
#6
|
|||
|
|||
This isn't black magic, Most cam manufacutres recommend 0.020" to 0.060" of lifter pre-load for the hydraulic lifters.
Since most of the adjustable rocket arms use an adjusting nut that has 24 TPI threads, it is easy to calculate the amount of movement/pre-load one turn creates. With 24 Threds per inch adjusters means to move the adjustment 1" requires 24 turns of the adjuster. Dividing 1 by 24 = 0.041667" per turn. If your adjuster has a different thread pitch you can calculate it the same way. Anyhow, one full turn from zero pre-load should put you into the center of the pre-load specification. |
#7
|
||||
|
||||
preload
In our dirt motors, we use a lot of hyd. cams, and also solid lift cams too, on the hyd. we use a hi-rev lifter(anti pump-up) and set them to 0 lash, the normal hyd. lifters we set to 1/8-1/4 turn past 0 lash. anymore than that always caused valve float over 4 grand in rpm
|
#8
|
||||
|
||||
My 2-cents:
The 0.020 to 0.060 is what Lunati recommends with there hydraulic lifters, too. Lifters made for zero preload (anti pump up) will say so. In my opinion, a good lifter with an internal snap ring to hold the guts in can be set at 0.010-0.020 for best results (1/4-1/2 turn), but those like Mopar Performance lifters with a wimpy wire retainer should stay 0.020 or more so the wire retainer doesn't get pounded out. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Hydraulic lifters – Maximum hydraulic intensity? | choper | Performance Talk | 3 | 06-27-2003 12:47 AM |
adjusting rockers with hydraulic lifters | smolski | Performance Talk | 1 | 09-30-2002 03:50 PM |
Adjustable rocker arms with hydraulic lifters. How to adjust? | 340727Dart | Performance Talk | 15 | 09-11-2002 11:38 AM |
adjusting roller rockers with hyd lifters | rigsy | Performance Talk | 5 | 07-15-2002 12:11 AM |
Swapping Hydraulic lifters to Solid Lifters? | 78 Red Express | Performance Talk | 3 | 06-16-2002 11:29 PM |