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#61 |
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Despite the disagreements of the subject matter this discussion of Valvetrain Geometry and how it legally applies to the rules of Stock Eliminator is fascinating.
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#62 | |
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My understanding is the cam lobe does have a taper. The lifter bottom has a radius to it. The size of the radius depends on how the cam lobe has been ground. I believe from the factory Ford has uses a different size radius on their lifter bottom than GM does. Stan |
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#63 | |
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The lobe taper has a taper across the face and the lifter faces are ground spherically with a crown in the center. Also, when the camshaft and lifters are installed, the lifters are offset by a small amount from the cam lobes. |
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#64 | |
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Although they are used in high impact applications such as ballistic armor, ceramics are brittle and have poor impact strength. When ceramics are used as ballistic armor, they are also surrounded by or encased in Kevlar material and replaced after receiving an impact. |
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#65 | |
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#66 |
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As has been said by a few here already, limit valve spring pressure. While a flat tappet does impose some limits as to what a cam lobe designer can do. Some of these limits maybe lifted with a roller lifter. Then what happens when the next weak link shows up? Another rules change?
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#67 |
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We changed to solids in the LT1 car because the hydraulics we're getting tired. Went from 10-30 to 5-30 and had rockers coming loose. Car is no faster with solids... however..if we ever get it to the point we can win a heads up race. A zero weight will probably work a little better with solids.
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#68 |
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Concerning cam and lifter wear issues with flat tappet cams, I was looking at my old Isky Cams catalog, and they offered some special "Hardface overlay" application on the lobes, which were meant to be used with their "Chilled Iron" flat tappet lifters. My catalog is from the 80s, so no idea if Isky still offers this stuff, but curious if anybody has any experience with these, in either a Stocker type engine, or anything else.
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#69 | |
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Some NASCAR teams ran the Isky solids with the hard face overlay. Also, although not mentioned often, Crower makes some great solid lifters with lots of options, including lightweight and billet steel lifters. |
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#70 |
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![]() I understand there's a big differences between a full race lifter and a street motor lifter BUT some of these suppliers are advertising M2 Tool Steel Lifters. They are made over seas. So we now have junk tool steel lifters floating around, too. Grrrrrr Little change of subject. Has anyone pulled the puck off of a Schubeck? How is it attached? Thinking maybe I could take a set of old lifters and weld M2 tool steel to bottom and have grd, hardened and coated. . Last edited by Terry Cain; 01-07-2022 at 11:18 AM. |
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