valve train pushrod geometry setting, weird question... maybe not |
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valve train pushrod geometry setting, weird question... maybe not |
orange914 |
Mar 18 2008, 05:23 PM
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#21
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
following the step by step valve geometry i've got a few possible issues? when no shims used and exhaust and intake geometry is set the swivel feet are almost bottomed out (almost no adjustment left). so next it was shimmed with .025, the geo/swivel tightness got better (not so close to bottoming against swivel) when shimmed with .040 shims i have more space to adjust up left before swivel contacts rocker (3/4 to 1 turn).
bottom line it seems to work out better with .040 shims. with no shims it has wider range of measurements between each valve -and- closer swivel foot to rocker arms. 1] is .040 shim o.k.? 2] if o.k. is 3/4 to 1 turn until swivel foot hits the bottom of the (modified) rocker acceptable? yes they are o.e.m. swivels from a 2.7 3] if not o.k. can i remove .030 or ? more from rocker arm 4] if none of the above is good what am i needing to do to correct this? mike |
toon1 |
Mar 19 2008, 04:48 PM
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#22
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
QUOTE (the only engines that should need more than .030 correction shims are equipped with longer than stock valves, 99.5% of reader should NEVER need more than .030 pad shims). the quote is from jake were you able to get satisfactory settings before you added shims? if so why shim? just to allow more adjustability? are you setting these at zero lash? what push rods? I read that quote also. We where not able to get a satisfactory reading on the geo @ 1/2 lift without shims. The geo would be close but not perfect. Also the swivel foot was 1/2 turn away from the rocker. Even with the .040 shim there is only 3/4 of a turn from the rocker Yes, it was set at 0 lash They are the manton p/r's that Jake sells and uses and where provided by him wht the purchase of the valvetrain kit. The question is, WITH a .040 shim, the swivel foot is ONLY 3/4 of a turn from bottoming out aginst the rocker. I felt this is too close, Mike does too, BUT we are not sure. |
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