The Jacobs Engine Brake
| PERFORMANCE DATA & APPLICATION INFORMATION |
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- Automatic controls for easy operation.
- Interfaces with electronic engines, transmissions, anti-lock braking systems,
vehicle stability and collision/rollover prevention systems.
- Performance optimized for highest retarding horsepower.
- Backed by engine distributors & dealers worldwide.
- Standard warranty that is one of the best in the industry.
- Lightweight design optimizes retarding & payload.
- Field proven reliability.
Benefits:
- Faster, steadier, more efficient braking performance.
- Reduced wear on engine, tires, wheel ends and service brakes.
- Lower vehicle maintenance costs.
- Less vehicle downtime.
- Enhanced driver confidence.
- Increased value at trade in
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| The Jacobs Engine Brake® is a device that mounts on, or within, the engine overhead. It changes the timing of the engine exhaust valves, turning the engine into a giant air compressor. The resulting retarding power is proportional to engine RPM (always stay within engine manufacturers recommendations). It is typically used on heavy-duty vehicles commercial vehicles ("big rig" trucks and buses) enabling safer vehicle speed control in several driving conditions, from flatlands to steep downhill descents. The result is increased productivity (thus profitability) from shorter trip times (faster downhill control speeds), and reduced maintenance costs and downtime (from reduced use of the foundation braking system).
Click here to learn how it works.
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Control Speed
"Control speed" is defined as the constant speed at which the forces pushing the vehicle forward on a grade are equal to the forces holding it back, without using the service brakes. In other words, the speed the vehicle will maintain without using the service brakes (a.k.a. "foundation brakes).
Case Study
The calculation for downhill control speeds is complex, however there is a standard (SAE J1489). Jacobs has used this standard to develop a retarding performance calculator to determine the what can be achieved with and without the use of our product. To the right is an example of a typical over-the-road application vehicle weighing 80,000 lbs. and descending a 6% grade (the maximum allowed on interstate highways) using a 13 speed manual transmission. Notice the dramatic difference between the control speeds of the same truck, with and without a Jake Brake engine brake.
NOTE: This is only an example and can only be evaluated as such. Control speeds will vary depending on several factors. This illustration is for explanation purposes only.
Control Speeds (MPH)
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Transmission Gear |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
No Engine
Brake |
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6.7 |
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Maximum
Engine Braking |
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19.5 |
26.4 |
34.2 |
49.6 |
56.1 |
67.1 |
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Heavy Duty Jake Brakes
