View Poll Results: Valve Lash on Hydraulic Flat Tappet w/ Rollers?
Less than 1/4 Turn
1
5.56%
1/4 Turn
5
27.78%
1/2 Turn
10
55.56%
3/4 Turn
2
11.11%
1 Turn
0
0%
More than 1 Turn
0
0%
Voters: 18. You may not vote on this poll
How About a poll: Valve Lash ?
07-11-2002, 11:50 PM
#1
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Car: '94 Corvette
Engine: LT1
Transmission: 4L60E
How About a poll: Valve Lash ?
How many turn do you use? Let us know, either professional, books, or hear say - how many turns when slack is taken up.
Not even sure if there is a different technique with rollers & flats, but for the most part let us say flats. Solid lifters - no thanks, cause I know there's a different tech involved.
To be honest, I am not even sure, there is a different tech with rollers or stamped.
How about Hydraulic flat tappet, with roller rockers – how many turns?
Ron
Not even sure if there is a different technique with rollers & flats, but for the most part let us say flats. Solid lifters - no thanks, cause I know there's a different tech involved.
To be honest, I am not even sure, there is a different tech with rollers or stamped.
How about Hydraulic flat tappet, with roller rockers – how many turns?
Ron
07-12-2002, 01:09 AM
#2
Supreme Member
All hydraulic cams run at no lash (0 lash). Wether flat tappet or roller. I think you are talking about lifter preload.
The proper design preload is to have the plunger depressed .030"/.060" in the lifter, with the valve closed. Whatever amount of rocker nut turns past 0 lash that causes this is ok.
Some racing applications call for .001 to .003" lash for a racing hyd cam valvetrain to avoid lifter pump up caused by valvetrain separation at high rpm. This special setting requires frequent adjustment and is not practical for normal street use.
The proper design preload is to have the plunger depressed .030"/.060" in the lifter, with the valve closed. Whatever amount of rocker nut turns past 0 lash that causes this is ok.
Some racing applications call for .001 to .003" lash for a racing hyd cam valvetrain to avoid lifter pump up caused by valvetrain separation at high rpm. This special setting requires frequent adjustment and is not practical for normal street use.
07-12-2002, 12:06 PM
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Car: 2005 Subaru STI
Engine: 153ci of Turbo Power!
Transmission: 6-Speed
I have always used 1/2 turn past zero lash with great results. However, with the new modifications and the conversion to CC 'R' series roller lifters I will be using minimal lash ... about 1/16-1/8 turn past zero lash.
Tim
Tim
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