![]() You tear the engine down every pass and inspect everything. “In drag racing, let’s say you’re running Nitro and you’re running 4 seconds at 300 mph. “Everybody looks at tractor pulling and drag racing as the same thing, and obviously they’re not,” he says. ![]() ![]() No matter what class of tractor pulling you run, one thing remains the same, these engines will eventually need to be rebuilt. They’re more along the lines of 498 cid with shorter strokes, but the same bore.” Then you get into the Blower Four-Wheel Drives, which are limited to 500 cid. Then you have the Multiple-Engine Modifieds that kind of use the same engine combo we run. “Then you get into some classes like the Two-Wheeler class. You also see a lot of 520 cid engines, 526 cid and 541 cid as well. Ours are 557 cid, which are 4.375˝ stroke and 4.500˝ bore. “You start out with the Mini Modified, which is what we run, and that is the lightest class weighing 2000-lbs. “There are numerous classes that use the alcohol-powered V8s,” Koester says. Some of the classes using alcohol-powered V8s are Modified Minis, Super Stock and Two-Wheel-Drive tractors. Of course, with these varying levels of horsepower on display at a tractor pull event, competitors are split into different classes. Then you get into the turbos, and turbos and ProChargers can get you well over 5,000 horsepower easy.” With the bigger screw blower – the C rotor is 20% bigger than the D rotor – you’re getting into 4,000 horsepower. Then you move to the screw blowers and you will be in the 3,500-3,800-horsepower range. With an 8-71, you’re looking at around 2,500 horsepower. “The power rating goes solely based on the supercharger or air introduced into the engine. Adam Koester, who runs Modified Mini tractors ‘Beast of Burden’ and ‘Walk the Line,’ builds his engines with ideas from both the Chrysler and the Chevrolet platforms. “As the engine has evolved over the years, we’ve done 8-71s, 14-71s, turbos, screw blowers, and now ProChargers are really coming back to life. “The rule-based stuff falls around the 14-71 supercharger for most divisions,” Koester says. In order to stay competitive, the predominant engines are supercharged. Speaking of putting the best thing on the plate that they can, in tractor pulling, that comes down to power. We try to put the best thing on the plate that we can.” We try to use the best in the business for our engines. We use Bryant billet crankshafts, GRP connecting rods, CP pistons, Victory valves, PAC springs, Callies camshafts and crankshafts. “We make our own main caps and pieces for the front cover. “We manufacture our own cylinder heads, rockers, valve covers, and intake manifolds,” he says. Koester’s engine builds start with Alan Johnson Performance Engineering blocks and then he takes care of the rest. But the Chrysler and the Chevrolet continue to be the best things on the market and most commonly used.” “We also use things from the Hemi such as the crank flange, the hemispherical cylinder heads and the ignition. “We use Chevrolet bore spacing, the Chevrolet rear thrust on the crankshaft and splayed main caps,” Koester says. Koester, who runs Modified Mini tractors ‘Beast of Burden’ and ‘Walk the Line,’ builds his engines with ideas from both the Chrysler and the Chevrolet. ![]() “Another big one that probably was just as predominant before the Hemi was the big block Chevrolet, which is still a staple in numerous racing applications.” “From a popularity standpoint, obviously the first thing that comes to mind is the Chrysler Hemi,” Koester says.
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