International Truck and Engine MaxxForce 7

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The International Truck and Engine MaxxForce 7 is a 6.4 liter V8 diesel engine.[1] The MaxxForce 7 is the successor to the International Truck and Engine VT 365.

The MaxxForce 7 boasts improved fuel economy, performance, and power over the VT 365. The MaxxForce 7 was also developed with meeting the EPA 2007 emissions standard in mind. Along with improved electronics, it features Siemens high-pressure common-rail fuel injection with electronically actuated piezoelectric linear actuator. This actuator, made of solid-state ceramic, converts electric energy into linear motion thus precisely controlling the needle's opening and closing through the hydraulic circuit. The engine also features a Borg Warner electronically controlled variable geometry turbocharger (EVRT). It also drives the exhaust gas recirculation (EGR) system and delivers more air at lower speeds. The engine features a closed-engine breather system and a pre-EGR oxidation catalyst (DOC) doesed in-cylinder to help meet EPA 2007.[2]

Though many other engine manufacturers choose to use selective catalytic reduction (SCR) to meet the EPA 2010 emission standards International has decided to not use SCR. Instead, International will use advanced EGR which they believe is more benefitial as there is no need for diesel exhaust fluid (DEF) and other equipment related to SCR.[3] The 2010 engine also features a regulated dual-stage turbochargers. The main turbo responds quickly for immediate take-off at low engine speeds, while the secondary turbo gives peak power at higher speeds and on steep grades.

Models

Below are models used in buses.[4]

Model Max. Power Max. revs Max. Torque Emmissions Certifications
MaxxForce 7 200 hp 2800 rpm 560 ft-lb EPA 2007, EPA 2010
MaxxForce 7 215 hp 2800 rpm 560 ft-lb EPA 2007, EPA 2010
MaxxForce 7 230 hp 2800 rpm 620 ft-lb EPA 2007, EPA 2010

References

  1. International MaxxForce 7, massforce.com, retrieved on 2009-08-02
  2. International applying MaxxForce to 2008 commercial vehicles, goliath.ecnext.com, retrieved on 2009-08-02
  3. Navistar reaffirms readiness for 2010, fleetowner.com, retrieved on 2009-08-02
  4. International MaxxForce 7 Brochure, fleetowner.com, retrieved on 2009-08-02