The Mack E7 460 is a powerful engine choice for heavy-duty trucking, offering robust performance for demanding loads. This review, based on firsthand experience, delves into the engine’s strengths, weaknesses, and key considerations for potential buyers.
The E7 460 delivers impressive power, especially when hauling heavy loads exceeding 90,000 lbs. gross weight. Performance is optimized at higher RPMs, with a recommended cruising RPM of 1600. The engine thrives in this range, pulling strong and keeping pace with larger displacement engines like the Caterpillar C-15. Peak performance is achieved above 1400 RPM, while power drops off significantly below that threshold. For optimal performance, gearing should be selected to maintain at least 1500 RPM at cruising speed. While the 460 provides ample power, engines with lower horsepower ratings in the E7 family often boast a more favorable torque curve.
Fuel efficiency is a notable advantage of the E7 460. Its lightweight design contributes to overall fuel savings. However, it’s important to pair the engine with a suitable transmission. A 13 or 18-speed transmission is recommended to maximize performance and efficiency.
Reliability is generally high, but the E7 460 does have some specific maintenance considerations. Parts availability can be a challenge, as many components are exclusive to Mack dealerships, which may not always have extensive inventory on hand. Experiences with Mack service centers can vary, so finding a reputable and skilled technician is crucial.
One significant advantage of a remanufactured Mack E7 460 is the potential for a 3-year unlimited mileage warranty. This warranty is typically offered when injectors and the turbocharger are replaced during the reman process. It’s advisable to inquire about warranty coverage when considering a used truck equipped with this engine.
The engine brake performance is considered adequate for a 12-liter engine but not exceptional. It functions as expected but might not provide the same stopping power as larger engine brakes.
Overall, the Mack E7 460 is a solid and reliable engine choice for heavy-duty applications. Its strengths lie in its high-RPM power, fuel efficiency, and potential for long-term warranty coverage. However, potential buyers should be aware of the specific maintenance requirements and parts availability. Choosing the right transmission and rear-end gearing is essential for maximizing the engine’s capabilities.
