A Matter Of Timing
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We won’t go through each step to degree the cam, since this has been covered many times in the past (see “A Matter of Degrees,” Sept. ’98). Crane’s specs call for the No. 1 intake to open at 3 degrees before TDC. This is indicated on the timing card as “(3) ATD,” which can be confusing. The parentheses indicate that the timing figure is actually a negative number, which means that -3 degrees after Top Dead Center (ATDC) is actually 3 degrees before Top Dead Center. Yeah, we know, it’s confusing—especially since this represents a difference of 6 degrees between 3 degrees ATDC and 3 degrees BTDC! We discovered our cam was installed straight up at TDC, or 3 degrees retarded. We chose to advance the cam 4 degrees, ultimately placing it at 1 degree advanced compared to Crane’s specs. View Related Article
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