The first step in selecting a turbocharger is to determine the engine's airflow requirements. This can be done by using a formula or by consulting with an engineer. The formula for calculating airflow requirements is:
$$ Q_{required} = \frac{P_{max} * V_{d} * RPM_{max}}{2 * K}$$
Where:
* Qrequired is the required airflow rate in cubic feet per minute (CFM)
* Pmax is the maximum boost pressure in pounds per square inch (PSI)
* Vd is the engine displacement in cubic inches (CI)
* RPMmax is the maximum engine speed in revolutions per minute (RPM)
* k is a constant that varies depending on the engine type (usually between 0.65 and 0.85)
Step 2: Select a turbocharger with an appropriate flow rate.
Once you know the engine's airflow requirements, you can select a turbocharger with an appropriate flow rate. The flow rate of a turbocharger is measured in cubic feet per minute (CFM). To ensure the turbocharger can provide the necessary airflow, select one rated at least 10-20% higher than the engine's airflow requirements
Step 3: Choose a turbocharger with the correct pressure ratio.
The pressure ratio of a turbocharger is the ratio of the outlet pressure to the inlet pressure. The pressure ratio of the turbocharger should be matched to the engine's compression ratio. A higher pressure ratio will result in more boost, but it will also put more stress on the engine. For a 100cc engine, a pressure ratio of 2:1 to 3:1 is typically used.
Step 4: Ensure the turbocharger has adequate wastegate control.
The wastegate is a valve that controls the amount of exhaust gas that bypasses the turbocharger. The wastegate is necessary to prevent the turbocharger from over-boosting and damaging the engine. Ensure a wastegate is included with the turbocharger or purchase one separately.
Step 5: Consider the turbocharger's size and weight.
The size and weight of the turbocharger are important factors to consider, especially for a small engine like a 100cc engine. A large, heavy turbocharger can add significant weight to the engine and affect its performance. Choose a turbocharger that is compact and lightweight.
By considering the factors discussed above, you can select a turbocharger that is well-suited for your 100cc engine.
