Tech Talk Article 12
"Leaping To Conclusions"
by David Reher
Page 1

        At the 1968 Summer Olympics, gold medal winner Bob Beamon soared 29 feet in the long jump - a leap nearly 3 feet longer than the previous record. Beamon excelled in jumping across a sand pit - but if jumping to conclusions were an Olympic event, I have no doubt that a drag racer would win the gold.

        Jumping to conclusions is an occupational hazard in racing. We want our cars to run faster, more consistently, and more successfully. The pressure to perform is intense, and often we allow our emotions to overrule our common sense.

        During my days as a math student, I learned there is an important difference between a conclusion and an assumption. A conclusion is a judgment based on deliberation and reasoning; an assumption is a statement that is accepted without proof or demonstration. So when I hear someone make a statement like "that carburetor's no good," or "the torque converter is junk," what I am usually hearing is really an assumption - an opinion stated as a fact.

        It's said that assumption is the mother of all screw-ups. I wouldn't disagree, because the proof is all around us. For example, you arrive at the track and discover that the spare rearend 

is missing from the trailer. You hear yourself saying, "I thought you put it in," while your partner replies, "I thought you did." Both assumed something that wasn't true - and now the gear ratio you need is sitting on a bench at the shop.

        In my roles as an engine builder and a racer, I'm very familiar with the cost of jumping to conclusions. When an engine doesn't perform properly, I run through a mental check list of possible solutions. It doesn't matter whether it's one of our own Pro Stock engines or a customer's bracket motor - the troubleshooting procedure is always the same. Ignition system OK? Check. Fuel system all right? Check. Valve springs good? Check. But when everything is 

"perfect" and the engine still doesn't run right, someone has obviously made a false assumption. If every component were functioning perfectly, there wouldn't be a problem!

        After decades in racing, I'm still learning how to avoid jumping to conclusions. I've seen brand-new batteries that were faulty, crank trigger magnets with reversed polarity, and carb floats that sank like stones. But just when I think 

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