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Originally Posted by BlueOval Ralph
This is a pretty lame excuse about the converting from Metric. There are computer programs and calcs to do this if this was problem it's just sloppy work by the people doing the work. Look at the Ford problems 3 years in a row at US Nationals, now Mopar.
Since they are built to Metric measurement that's what should be submitted and let NHRA do conversion, better yet NHRA should do measuring in metric problem solved.
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It's not just the spec that is the problem, its the way NHRA measures parts versus the way the OEM's measure parts. For instance, NHRA has a plus .005 and minus.015 spec on valves size and now the OEM'S have to convert their specs to fit NHRA's specs. Do you honestly think that the OEM's use Plus.005 and Minus .015 as their factory specs? In Ford's case in 2009 and 2011 U.S. Nationals, the mean of the spec wasn't right causing the measured part to be out of NHRA'S spec When was the last time that you guys were in teardown with your own stuff?. I measure my parts pretty close, but one time when I went through teardown at the U.S. Nationals, one of my valves was right on the low limit and I didn't think I was even that close before it was measured. Remember that NHRA uses a Dial or digital caliper to measure your parts with and they just zero it out first before they check your parts. You better hope that your parts measure to the way they are measuring them. The late Division 3 tech director Marty Barrett told a buddy of mine once that their methods don't have to be right, they just have to be official. If you have to go through teardown you better hope that your work isn't sloppy also.