Matched with the right injectors (typically triple-feed designs and International or John Deere based) and airflow (big single or two-stage turbo arrangements), a 17mm Sigma can support in excess of 3,000hp. The pump body is machined from high density billet-aluminum and incorporates 17mm plungers, a special grind camshaft and other proprietary internals (such as delivery valves and holders, control sleeves, pump vent and governor, among other components). The Billet Mack DaddyĬolumbus Diesel Supply’s 17mm billet Sigma pump is the big daddy of the injection pump world. To put things into perspective, per Bosch Motorsport, a stock Bosch P7100 with 12mm plungers flows just 135 cc. This factory, cast-aluminum 16mm Sigma offered by Columbus Diesel Supply can flow up to 1,600 cc of fuel, although most engine combinations start out using 950 to 1,100 cc. Although truck pullers have been using Sigmas for more than a decade, breakthroughs in billet engine blocks, head-flow, camshafts and turbo technology in recent years has allowed more of their fueling capabilities to be realized. more fuel being injected quicker), which leads to better engine efficiency and, ultimately, horsepower. These massive plungers facilitate a much quicker injection rate (i.e. However, instead of making use of 12mm plungers (what you’d find in a Bosch P7100), the Sigma came with 16mm plungers right from the factory. Mechanical Pumps The “Sigma”Īlso known as the $10,000 injection pump, the Sigma pump is a plunger-style, inline mechanical pump similar in design to the Bosch P7100 found on the 5.9L Cummins that powered Dodge Ram 2500s and 3500s from ’94-’98. From the infamous mechanical “Sigma” pump to the multi-CP3 combinations that’ve made 2,500hp common-rail engines possible, the following technology is what’s bolted to the top sled pullers and fastest drag racers in North America. Everything from highly modified factory-based pumps to exotic units machined from a solid chunk of billet-aluminum are employed, along with multiple high-pressure pumps being the norm on high performance common-rail Cummins, Duramax and Power Stroke mills.īelow, we’ll give you a taste of the baddest of the bad in diesel injection technology. In the far corner of diesel motorsports-where the 2,000 to 3,000hp engines live-injection pumps can get pretty wild. Increase both volume and pressure and you make really big power. Increase that pressure and you add power. Whether you’re talking mechanical P-pumps, high-pressure common-rail pumps or even HEUI pumps, they’re all the vital middle man in a system that relies on highly-pressurized fuel in order for the engine to work its compression-ignition magic. As the heart of any diesel’s power-making puzzle, the injection pump can never be overlooked.
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