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Performance testing is a critical aspect of understanding how modifications affect engine output. In this article, we will explore the dyno results before and after porting on the 13B-REW engines. These engines, known for their rotary design and high-revving capabilities, are popular in the automotive performance community.
Understanding the 13B-REW Engine
The 13B-REW engine is a member of the Mazda Wankel rotary engine family. It features a unique design that allows for high power output in a compact size. The engine’s configuration includes:
- Two rotors
- Sequential twin turbochargers
- High compression ratio
What is Porting?
Porting refers to the modification of the intake and exhaust ports of an engine. This process can improve airflow, leading to better performance. In rotary engines, porting is crucial for optimizing the engine’s breathing capabilities. The main types of porting include:
- Street porting
- Race porting
- Bridge porting
Dyno Testing Methodology
To assess the impact of porting on the 13B-REW engine, we conducted a series of dyno tests. The testing procedure included:
- Baseline runs without porting
- Modification of the engine through porting
- Subsequent dyno runs after porting
Baseline Dyno Results
Before any modifications, the baseline dyno results for the 13B-REW engine showed a maximum power output of approximately 250 horsepower at 7,000 RPM. The torque curve exhibited a peak torque of around 215 lb-ft at 5,500 RPM.
Porting Process
The porting process involved careful adjustments to the intake and exhaust ports. This included:
- Widening the intake ports
- Reshaping the exhaust ports
- Polishing the port surfaces
Post-Porting Dyno Results
After completing the porting modifications, we conducted a second round of dyno testing. The results were significantly improved:
- Maximum power output increased to 300 horsepower at 7,500 RPM
- Peak torque rose to 235 lb-ft at 6,000 RPM
Performance Comparison
The comparison of dyno results before and after porting highlights the effectiveness of the modifications:
- Power increase: 50 horsepower
- Torque increase: 20 lb-ft
- Higher RPM range for peak power
Conclusion
The performance testing of the 13B-REW engine before and after porting demonstrates a notable enhancement in power and torque. These results confirm that porting is a valuable modification for those looking to maximize the performance of their rotary engines. Enthusiasts can benefit from understanding the impact of such modifications on their vehicles.