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High Power Density
High Power Density® (HPD®) technology provides the lightest, most cost-effective, highest power retarding technology available.
Performance benefits of Jacobs High Power Density technology
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Increase in braking power at cruise speeds
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Increased payload for the retarding performance you need
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Lower total cost of ownership
Jacobs’ HPD Benefits
- Jacobs’ full 2-stroke HPD technologies realize up to 100% performance improvements at low engine speeds compared to traditional compression release brakes or up to 40% improvements at higher engine speeds.
- Makes up for decreased aerodynamic drag and decreased rolling resistance of the latest trucks
- Compensates for the trend toward lower engine speed operation and specification of smaller displacement engines
- Operates at engine speeds drivers use, avoiding downshifting during retarding
- An alternative to a driveline retarder with lower cost and weight, no maintenance, low impact to the vehicle and without thermal fade
- A modular system to fit your application needs
- Compatible with other valvetrain technologies including cylinder deactivation
- Fully integrated into the engine control module (ECM) and compatible with the latest cruise control and safety features
- Increases engine brake performance on alternative fuel engines with lower compression ratios such as natural gas and hydrogen
- Standard dedicated cam compression release braking system
- Hardware includes rocker brake, normal exhaust and intake bridges, BGR/CR cam, and brake rocker biasing
- Standard performance based on the air handling and load carrying capability of the engine
- Hardware includes the same standard rocker brake, cylinder deactivation bridge on exhaust main event, cam design with multiple CR/BGR events, and exhaust biasing
- Performance throughout the full RPM range is significantly improved from standard braking-efficient upgrade that does not require significant changes to the overall valvetrain
- Cost-efficient upgrade that does not require significant changes to the overall valvetrain
- Hardware includes rocker brakes and cylinder deactivation bridges on intake and exhaust, cam design with optimized intake/exhaust events, and full rocker biasing
- Intake optimization for HPD improves airflow and increases performance, especially at low RPM
- Slightly more complex system to achieve highest performance level possible
- Provides capability for full cylinder deactivation
Natural Gas Engine + HPD Engine Brake
The smaller turbo and smaller compression ratios of natural gas engines negatively impact the brake retarding power by up to 25%. Jacobs' High Power Density Engine Brake makes up for this loss so fleets can still safely haul standard load sizes.
Tech Talk: HPD
Dive deeper into High Power Density engine braking. Watch our HPD Tech Talk to learn more about how the HPD engine brake works, its performance, its benefits, how it compares to a driveline retarder, and how it improves engine braking for natural gas engines.
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