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1949 HRD Works Order Form details
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<blockquote data-quote="greg brillus" data-source="post: 176917" data-attributes="member: 597"><p>Using ATC and degrees in the one sentence suggests that it relates to ignition or cam timing........several times here folks mention about setting cams with equal lift at 4 deg BTDC on the overlap stroke........perhaps they (the factory) had same idea only using the equal lift measured at TDC this would make the cams advanced, and very typical of cam timing for an engine where you want good torque.......Experience would say that making this figure slightly more is perhaps even better.......as for the 13 figure, not sure what that means, it is too early for an exhaust closing point.......Unless it is a crank degree figure that relates to a cam at a certain amount of lift........most typical of cam set ups used by other manufacturers........generally using a figure of 0.050" lift as opposed to the actual closing/opening point as these can be too difficult to find with some cams.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 176917, member: 597"] Using ATC and degrees in the one sentence suggests that it relates to ignition or cam timing........several times here folks mention about setting cams with equal lift at 4 deg BTDC on the overlap stroke........perhaps they (the factory) had same idea only using the equal lift measured at TDC this would make the cams advanced, and very typical of cam timing for an engine where you want good torque.......Experience would say that making this figure slightly more is perhaps even better.......as for the 13 figure, not sure what that means, it is too early for an exhaust closing point.......Unless it is a crank degree figure that relates to a cam at a certain amount of lift........most typical of cam set ups used by other manufacturers........generally using a figure of 0.050" lift as opposed to the actual closing/opening point as these can be too difficult to find with some cams. [/QUOTE]
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1949 HRD Works Order Form details
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