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 20 2008, 08:33 AM
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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 |
mike what cam are you using? in the valve train article jake says exhaust pushrods are generally 1 mm shorter on his cams what are you getting as your pushrod lengths? intake? exhaust? Mike is using Jakes 9550 cam. In the earlier postsI stated there is only about a 1.5mm delta between all 8 p/r's. The cam and p/r length is really not of concern. The concern is the swivel foot clearance in relation to the rocker and what to do about it, as posted ealier. I spent 11hrs with Mike making sure his geo was right. We where not able to get a satifactory geo ( at half lift ) w/o .040 shims. Keith |
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