Re: Williams/Hinckley timing paper questions
The first recommended specs were based on dial indicator diagrams I took on a new GM LT-1 cam purchased from a Chevrolet dealer back in the seventies, and I also measured and characterized rocker ratio behavior at that time that are reported in all versions of the paper.
The revised specs are based on the actual drawing lobe lift data, inches to five decimal places, every CAM degree. Then I built an Excel program to compute the velocity, acceleration, and jerk. This allowed me to define the tops of the clearance ramps with a much higher degree of accuracy. This is why I say to only pay attention to the 09/08 revision.
Previous revisions are OBSOLETE!!! IGNORE THEM!I have contacted Web sites that still have old versions with a e-copy of the 09/08 revision with a request to update and was ignored by all. This is a real problem with the Web. Once something is posted it's very difficult to remove even if the information is superseded or proves to be inaccurate.
Duke
The first recommended specs were based on dial indicator diagrams I took on a new GM LT-1 cam purchased from a Chevrolet dealer back in the seventies, and I also measured and characterized rocker ratio behavior at that time that are reported in all versions of the paper.
The revised specs are based on the actual drawing lobe lift data, inches to five decimal places, every CAM degree. Then I built an Excel program to compute the velocity, acceleration, and jerk. This allowed me to define the tops of the clearance ramps with a much higher degree of accuracy. This is why I say to only pay attention to the 09/08 revision.
Previous revisions are OBSOLETE!!! IGNORE THEM!I have contacted Web sites that still have old versions with a e-copy of the 09/08 revision with a request to update and was ignored by all. This is a real problem with the Web. Once something is posted it's very difficult to remove even if the information is superseded or proves to be inaccurate.
Duke
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