trucksource
PACCAR MX Engines by MHC Truck Source
PACCAR MX Engines
The PACCAR MX is a 12.9 liter displacement, in-line 6 cylinder design with 4 valves per cylinder. It features a low cam block design, which results in a compact lightweight block. The PACCAR MX offers 380 to 485 horsepower and peak torque at a stout 1,750 foot pounds for the multi torque 430hp.
PACCAR MX Engine Specification HP Torque (lb-ft)
Technical Specifications 380 1450
Displacement 12.9L 405 1450
Bore x Stroke (mm) 130x162 430 1550 / 1750
Governed Speed 2200 rpm 455 1650 B10
Design Life 1.0 M Miles 485 1650
Dry Weight 2,640 lbs.
Engine Displacement
There’s No Replacement for Displacement – Select the proper displacement
You need to understand that a customer coming out of an ISX15 equipped truck with a performance spec will have certain expectations about truck performance. Simply dropping a 13 liter block into the same application and same drivetrain can be a recipe for disappointment.
ISX15 (or any 15L) customers need to understand the differences in driving and operating of the PACCAR MX (or any other 13L). Vehicle startability and peak torque/horsepower capability are the two big differentiators between these products.
MHC Kenworth and MHC Truck Source mhc-trucks.com
Paccar Engines
Call 816-517-3333 or 816-912-5813
Email: sean.barnett@mhc.com
Startability
Torque at clutch engagement is a function of the engine family displacement. This applies all the way from the medium duty up through our heavy duty engines. The PACCAR MX offers up to 935 ft-lbs at clutch engagement for starting the load, while the ISX15 offers up to 1000 ft-lbs. This is the first feature which effects startability. Proper gearing and sufficient overall reduction in the drivetrain components can minimize the differences between blocks with different starting torque. More torque at engagement provides greater flexibility with large loads and steep grades. With appropriate transmission and rear axle gearing, vehicle launch events and driveability can be appropriately matched to customer expectations.
Keep in mind that maximum torque at clutch engagement represents the full fuel capability of the block. In normal driving, only a portion of this capability will typically be used to get a loaded vehicle started.
Peak Torque/Horsepower
Mechanical and thermal efficiency (load vs. power/displacement) becomes a consideration in high load cases (high GCW and /or steep grades). Peak horsepower determines how fast a truck can climb a particular grade. Peak torque (and the shape of the torque curve) determines the range of engine speeds where the truck can be operated without having to shift.
A larger displacement engine can produce equivalent mechanical output to a smaller displacement engine with less turbo boost, less pumping losses, and lower cylinder pressures. A smaller displacement block will be operating at a higher percentage of its maximum capability to produce the equivalent output for high demand applications as compared to the bigger displacement block. A larger block operating at a reduced power factor will typically be more durable and may potentially be more efficient in a high-demand application. Keep this in mind when interviewing your customer. Maximum approved GCW for the PACCAR MX engine is 140,000 lbs. for the reasons listed above.
In applications where continuous operation at high horsepower is not required (for example most 80,000 lbs. linehaul applications), a smaller displacement block can provide a lighter, less bulky power plant that may offer improved life-cycle costs in comparison to its large-displacement counterpart. It will provide plenty of torque and horsepower for typical road conditions, and will only be operating at peak torque or horsepower a small part of the time.
Select the right-sized block for the intended application. Heavier loads and extended operations on steep grades are more suitably served by a larger displacement engine.
Torque Curves
The PACCAR MX engine offers very desirable torque curves. The flat torque curves provide a wide operating RPM band for increased fuel economy and enhanced driveability. The PACCAR MX provides maximum available torque from 1100 RPM all the way up to the point of peak power output. Peak power output is then available from that point up to 1900 RPM, at which point both torque and horsepower fall off as the engine approaches governed RPM.
The wide RPM band where peak torque is available greatly enhances the driveability of the engine and allows the driver to pull the engine speed down as low as needed to minimize shifts.
MHC Kenworth and MHC Truck Source mhc-trucks.com
Paccar Engines
Call 816-517-3333 or 816-912-5813
Email: sean.barnett@mhc.com
Multi-Torque Engine Rating
The multi-torque rating offers additional torque while operating in the top gears of the transmission. This torque enhancement can allow the operator to hold a gear longer on a grade and avoid shifting, possibly to a less efficient operating point for the engine. The multi-torque engine works best on rolling hills (slight grades) where the driver can stay in the top two gears and utilize the extra torque.
The multi-torque rating is not recommended for most mountain routes. When the driver drops below the top two gears, torque drops to 1550 ft-lbs, which can force more shifts and longer times on the grade, potentially impacting fuel economy.
• The upper torque limit is only available in the top 2 gears.
• The higher torque limit is only available below 1350-1400 RPM.
• The goal is to encourage driving in the engine sweet spot.
Fuel Economy
There is not one single thing you can do to maximize your fuel economy, just as there is not one single thing you can do to guarantee success in the trucking business.
Fuel economy is the energy efficiency of a particular vehicle, and is given as a ratio of distance traveled per unit of fuel consumed
Every bit of energy produced or used by a truck comes from the fuel in the tank. The heat of the engine, the headlights, the A/C, the instrument lights are the result of converting diesel fuel into energy.
• Fuel Economy = Distance Traveled/Unit of fuel consumed (miles/gallon)
• Largest consumers of fuel: (top 3)
- Air Resistance
- Tire Rolling Resistance
- Engine / Powertrain
• Each MPH over 55 = approximately 1.6% MPG
• Extended Idling
- General Practice: 950 RPM compared to 650 RPM approximately 30% increase in fuel burned
- Winter Operations: Try to minimize idle time for heat during winter operation. With use of winter fuel, economy at idle is impacted more during cold weather.
• Fuel Type (winter vs. summer)
- Use of winter fuel can effect fuel economy approximately 3-10% vs. summer fuel.
Fuel Economy Performance
PACCAR MX provides maximum power with excellent fuel efficiency to optimize performance in virtually any application.
What is performance?
• The accomplishment of a given job measured against specific known standards of accuracy, completeness, cost and speed.
• Moving a load a longer distance in a given amount of time with the least amount of fuel consumed.
• Ability to start and maintain the load on a grade with a given drivetrain.
MHC Kenworth and MHC Truck Source mhc-trucks.com
Paccar Engines
Call 816-517-3333 or 816-912-5813
Email: sean.barnett@mhc.com
PACCAR MX Engines by MHC Truck Source
PACCAR MX Engines
The PACCAR MX is a 12.9 liter displacement, in-line 6 cylinder design with 4 valves per cylinder. It features a low cam block design, which results in a compact lightweight block. The PACCAR MX offers 380 to 485 horsepower and peak torque at a stout 1,750 foot pounds for the multi torque 430hp.
PACCAR MX Engine Specification HP Torque (lb-ft)
Technical Specifications 380 1450
Displacement 12.9L 405 1450
Bore x Stroke (mm) 130x162 430 1550 / 1750
Governed Speed 2200 rpm 455 1650 B10
Design Life 1.0 M Miles 485 1650
Dry Weight 2,640 lbs.
Engine Displacement
There’s No Replacement for Displacement – Select the proper displacement
You need to understand that a customer coming out of an ISX15 equipped truck with a performance spec will have certain expectations about truck performance. Simply dropping a 13 liter block into the same application and same drivetrain can be a recipe for disappointment.
ISX15 (or any 15L) customers need to understand the differences in driving and operating of the PACCAR MX (or any other 13L). Vehicle startability and peak torque/horsepower capability are the two big differentiators between these products.
MHC Kenworth and MHC Truck Source mhc-trucks.com
Paccar Engines
Call 816-517-3333 or 816-912-5813
Email: sean.barnett@mhc.com
Startability
Torque at clutch engagement is a function of the engine family displacement. This applies all the way from the medium duty up through our heavy duty engines. The PACCAR MX offers up to 935 ft-lbs at clutch engagement for starting the load, while the ISX15 offers up to 1000 ft-lbs. This is the first feature which effects startability. Proper gearing and sufficient overall reduction in the drivetrain components can minimize the differences between blocks with different starting torque. More torque at engagement provides greater flexibility with large loads and steep grades. With appropriate transmission and rear axle gearing, vehicle launch events and driveability can be appropriately matched to customer expectations.
Keep in mind that maximum torque at clutch engagement represents the full fuel capability of the block. In normal driving, only a portion of this capability will typically be used to get a loaded vehicle started.
Peak Torque/Horsepower
Mechanical and thermal efficiency (load vs. power/displacement) becomes a consideration in high load cases (high GCW and /or steep grades). Peak horsepower determines how fast a truck can climb a particular grade. Peak torque (and the shape of the torque curve) determines the range of engine speeds where the truck can be operated without having to shift.
A larger displacement engine can produce equivalent mechanical output to a smaller displacement engine with less turbo boost, less pumping losses, and lower cylinder pressures. A smaller displacement block will be operating at a higher percentage of its maximum capability to produce the equivalent output for high demand applications as compared to the bigger displacement block. A larger block operating at a reduced power factor will typically be more durable and may potentially be more efficient in a high-demand application. Keep this in mind when interviewing your customer. Maximum approved GCW for the PACCAR MX engine is 140,000 lbs. for the reasons listed above.
In applications where continuous operation at high horsepower is not required (for example most 80,000 lbs. linehaul applications), a smaller displacement block can provide a lighter, less bulky power plant that may offer improved life-cycle costs in comparison to its large-displacement counterpart. It will provide plenty of torque and horsepower for typical road conditions, and will only be operating at peak torque or horsepower a small part of the time.
Select the right-sized block for the intended application. Heavier loads and extended operations on steep grades are more suitably served by a larger displacement engine.
Torque Curves
The PACCAR MX engine offers very desirable torque curves. The flat torque curves provide a wide operating RPM band for increased fuel economy and enhanced driveability. The PACCAR MX provides maximum available torque from 1100 RPM all the way up to the point of peak power output. Peak power output is then available from that point up to 1900 RPM, at which point both torque and horsepower fall off as the engine approaches governed RPM.
The wide RPM band where peak torque is available greatly enhances the driveability of the engine and allows the driver to pull the engine speed down as low as needed to minimize shifts.
MHC Kenworth and MHC Truck Source mhc-trucks.com
Paccar Engines
Call 816-517-3333 or 816-912-5813
Email: sean.barnett@mhc.com
Multi-Torque Engine Rating
The multi-torque rating offers additional torque while operating in the top gears of the transmission. This torque enhancement can allow the operator to hold a gear longer on a grade and avoid shifting, possibly to a less efficient operating point for the engine. The multi-torque engine works best on rolling hills (slight grades) where the driver can stay in the top two gears and utilize the extra torque.
The multi-torque rating is not recommended for most mountain routes. When the driver drops below the top two gears, torque drops to 1550 ft-lbs, which can force more shifts and longer times on the grade, potentially impacting fuel economy.
• The upper torque limit is only available in the top 2 gears.
• The higher torque limit is only available below 1350-1400 RPM.
• The goal is to encourage driving in the engine sweet spot.
Fuel Economy
There is not one single thing you can do to maximize your fuel economy, just as there is not one single thing you can do to guarantee success in the trucking business.
Fuel economy is the energy efficiency of a particular vehicle, and is given as a ratio of distance traveled per unit of fuel consumed
Every bit of energy produced or used by a truck comes from the fuel in the tank. The heat of the engine, the headlights, the A/C, the instrument lights are the result of converting diesel fuel into energy.
• Fuel Economy = Distance Traveled/Unit of fuel consumed (miles/gallon)
• Largest consumers of fuel: (top 3)
- Air Resistance
- Tire Rolling Resistance
- Engine / Powertrain
• Each MPH over 55 = approximately 1.6% MPG
• Extended Idling
- General Practice: 950 RPM compared to 650 RPM approximately 30% increase in fuel burned
- Winter Operations: Try to minimize idle time for heat during winter operation. With use of winter fuel, economy at idle is impacted more during cold weather.
• Fuel Type (winter vs. summer)
- Use of winter fuel can effect fuel economy approximately 3-10% vs. summer fuel.
Fuel Economy Performance
PACCAR MX provides maximum power with excellent fuel efficiency to optimize performance in virtually any application.
What is performance?
• The accomplishment of a given job measured against specific known standards of accuracy, completeness, cost and speed.
• Moving a load a longer distance in a given amount of time with the least amount of fuel consumed.
• Ability to start and maintain the load on a grade with a given drivetrain.
MHC Kenworth and MHC Truck Source mhc-trucks.com
Paccar Engines
Call 816-517-3333 or 816-912-5813
Email: sean.barnett@mhc.com