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 |
nathansnathan |
Jan 23 2014, 10:37 AM
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#2
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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 |
I had a place in long beach cut pushrods once. They said they'd use a lathe, but when I picked them up they said they used a hacksaw and you could tell by the gaps. (IMG:style_emoticons/default/mad.gif) The ends only seat on the longest part if they're not faced. Personally I would go to +/- 5 tenths - keep them within a thousandths of an inch and do them per valve - not gonna happen with a hacksaw. (IMG:style_emoticons/default/biggrin.gif)
I recall reading a post by Jake on thesamba about the 9590 cam, you would see about .426 intake and .415 exhaust on account of the different ratios of the rocker arms. |
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