![]() It has both National and Regional Divisions with similar classes competing in both venues. Over the years, it has sanctioned pulls in many eastern states. The NTPA is at the top level of pulling and was formed in 1969. But its rules are very similar to the other groups allowing pullers to often compete with multiple pulling organizations. NTPA is not the only pulling organization in the USA or certainly other countries. One of the sport’s most recognized members, Gregg Randall, general manager with the National Tractor Pulling Association (NTPA) was a valuable contributor to this article. Near the end of the pull, when the engine/engines are striving for that final inch or two, the strain on the engine is stretched to the max. Obviously, it is imperative to quickly acquire maximum momentum. But they make the task even more challenging because the sled is getting heavier with every foot it moves down the track. There is incredible power and torque required to get those thousands of pounds moving in the first place. This article will attempt to closely examine the engines that perform the amazing feats of pulling power, made harder by the fact that in all cases the weight to be pulled is sitting at a dead stop. For many, the creativitiy of one-off pulling engines is a necessity, as the cost of a turn-key engine would keep them from competing in the sport. It’s amazing how some of these engine builders demonstrate amazing technology with their builds. It’s long been the situation that most of the engines are home-built. And finally there are those who buy a partially assembled, company built engine and finish it off to their liking. Some classes use mostly “bought” engines, others see teams buying the parts and pieces from professional engine builders and assembling the engines themselves. It’s an engine builder’s dream where the rules allow modifications in all classes to varying degrees. The technology is amazing, touching the levels of national drag and stock car racing. In certain classes, more than one engine is allowed on a single pulling vehicle. ![]() The sport has grown from those humble roots to tractors with a varied collection of powertrains and numerous engine types.
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