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The process of porting engines is a crucial aspect of tuning and enhancing performance, particularly in rotary engines like the 20B and 13B. This article provides a comprehensive comparison of the power and cost implications of porting in these two engine types.
Understanding 20B and 13B Engines
The 20B and 13B engines are both part of Mazda’s renowned Wankel rotary engine family. Each engine has distinct characteristics that influence their performance and tuning potential.
- 20B Engine: A three-rotor engine known for higher displacement and power output.
- 13B Engine: A two-rotor engine that is lighter and more compact, often favored for its balance of power and efficiency.
Power Output Comparison
Power output is one of the primary reasons for porting an engine. Both the 20B and 13B can benefit from porting, but the extent of these benefits can vary.
20B Engine Power Gains
Porting a 20B engine can lead to significant power increases due to its larger displacement. The following factors contribute to its power potential:
- Increased airflow through larger ports.
- Higher compression ratios achievable with porting.
- Improved exhaust flow leading to better scavenging.
Typical power gains from porting a 20B engine can range from 50 to 100 horsepower, depending on the extent of the porting and supporting modifications.
13B Engine Power Gains
The 13B engine, while smaller, also shows considerable improvements with porting. Here are the key aspects:
- Enhanced throttle response due to increased airflow.
- Potential for higher RPMs with proper porting techniques.
- Ability to achieve a balanced power curve across the RPM range.
Power gains for the 13B can be between 30 to 70 horsepower, making it a popular choice among enthusiasts seeking a lightweight performance upgrade.
Cost Comparison of Porting
Cost is a significant factor when considering porting an engine. The expenses can vary based on the engine type, the complexity of the porting job, and the desired outcome.
Cost of Porting a 20B Engine
Porting a 20B engine typically incurs higher costs due to its complexity and the amount of work required. Here are some factors influencing the cost:
- Labor costs for skilled technicians experienced with rotary engines.
- Materials and tools required for precision porting.
- Additional modifications needed to support increased power output.
The total cost for porting a 20B engine can range from $1,500 to $3,000, depending on the level of customization and additional upgrades.
Cost of Porting a 13B Engine
Porting a 13B engine is generally more affordable, making it an attractive option for budget-conscious enthusiasts. Key cost considerations include:
- Lower labor costs due to simpler porting processes.
- Fewer materials required for modifications.
- Potential for DIY porting for experienced individuals.
The cost for porting a 13B engine typically ranges from $800 to $1,800, depending on the specific modifications and labor involved.
Conclusion
In summary, both the 20B and 13B engines offer unique advantages when it comes to porting. The 20B provides more significant power gains but at a higher cost, while the 13B presents a more budget-friendly option with respectable performance enhancements. Ultimately, the choice between the two will depend on individual goals, budget constraints, and performance expectations.