How to cut steel pushrods, Valve Train Set-Up |
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How to cut steel pushrods, Valve Train Set-Up |
Highland |
Jan 23 2014, 09:25 AM
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#1
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Senior Member Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
How to most people get their pushrods cut? Should I take the pushrods to the same machinest that worked on my engine parts (crank, cylinders, rods,...) or to a regular machine shop?
Also, what tolerance should I give them? +/-0.001"? Below are my numbers for a Raby 9590 cam with 0.426" lift for exhaust and intake. Are these numbers typical? Cylinder.....Intake Lift....Intake Rod Length 1...............0.432................10.567" 2...............0.433................10.607 3...............0.431................10.640 (required 0.03 shim) 4...............0.424................10.578 Cylinder.....Exhaust Lift....Exhaust Rod Length 1...............0.410...............10.623" 2...............0.409...............10.618 3...............0.412...............10.663 (required 0.03 shim) 4...............0.410...............10.612 |
stugray |
Jan 23 2014, 11:08 AM
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#2
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE on account of the different ratios of the rocker arms. Oh, but I thought the rocker ratios were supposed to be exactly the same..... |
nathansnathan |
Jan 23 2014, 12:22 PM
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#3
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Senior Member Group: Members Posts: 1,052 Joined: 31-May 10 From: Laguna Beach, CA Member No.: 11,782 Region Association: None |
QUOTE on account of the different ratios of the rocker arms. Oh, but I thought the rocker ratios were supposed to be exactly the same..... Since it's not a split lift cam, there's nothing else but the rocker ratio that could account for the difference everyone is seeing, right? That's definitely what he said, anyway, 1.25 vs 1.3 to 1. I found the link. http://www.thesamba.com/vw/forum/viewtopic.php?t=236531 |
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