The new Navistar "Power Stroke" Direct Injection (D.I.) Diesel Engine powering Ford pickup trucks is indeed an impressive performer when compared to the non-turbocharged Indirect Injection Diesel (I.D.I.) offered from 1983 to 1993.

However, when compared to an older vehicle fitted with a Hypermax Engineering Turbocharger and Intercooler System the performance falls short of expectations. This is because the Power Stroke engine is rated at 215 BHP at 3000 RPM; while a Hypermax Turbocharged, Intercooled (I.D.I.) Engine is rated at 260 BHP at 3300 RPM. This power level can be also achieved with the "Power Stroke" Engine but not without first reducing the exhaust temperatures. The "Power Stroke" 's maximum power is limited by its exhaust temperatures which approach 1350 degrees F at the 215 BHP rating (the maximum allowable exhaust temperature for most diesel engines).

These high exhaust temperatures can be reduced by installing an air-to-air heat exchanger (intercooler) between the turbocharger compressor discharge and the intake manifold. This is because cooling the intake manifold air temperature also lowers the exhaust temperature. The cooler air temperature lowers the cylinder firing pressures which in turn reduce the thermal and mechanical loads on the engine. The increased air density resulting from cooler intake manifold air temperature increases power 10% and fuel economy approximately 5%. Engine life is extended over that obtained with a non-intercooled turbocharged engine. The New Hypermax (D.I.) Intercooler System design is virtually the same as those found on large, over-the-road, diesel trucks where fuel mileage and overall engine efficiency are of utmost importance.

HYPERMAX "POWER STROKE" ENHANCEMENTS