No, cammed cars are not inherently illegal in California, but modifications, including camshafts, must comply with the state's stringent emissions regulations. The legality hinges on whether the modified components are certified and do not alter the vehicle's emissions beyond legal limits.
Understanding California's Emissions Laws
California has some of the strictest vehicle emissions laws in the United States, enforced primarily by the California Air Resources Board (CARB). These regulations apply not only to new vehicles but also to aftermarket parts and modifications on existing vehicles. When it comes to "cammed" cars (vehicles with modified camshafts), the key concern is how these changes affect the engine's exhaust emissions.
The Role of Certification (EO Numbers)
For a modified camshaft or any other performance part to be legal for street use in California, it often requires an Executive Order (EO) number from CARB. An EO number signifies that the part has been tested and certified not to increase vehicle emissions.
- Specific Engine Certification: It's crucial that parts like cams, pistons, and intakes are certified by the Environmental Protection Agency (EPA) or CARB specifically for the exact engine in your car. A part certified for one engine model might not be legal for another, even if they seem similar.
- Limited Customization: While some parts might be exempted by CARB to work with various engines, this strict certification process means you cannot completely customize your engine with uncertified components to your liking if you intend to drive the car on public roads.
Smog Check and Visual Inspection
Every vehicle registered in California is subject to regular smog checks, which include both an emissions test and a visual inspection.
- Visual Inspection: During the visual inspection, a smog technician will look for uncertified aftermarket parts, missing or modified emissions control equipment, and any other non-compliant modifications. If your camshaft modification does not have an EO number or is otherwise non-compliant, your vehicle will fail this inspection.
- Emissions Test: Even if a modified camshaft performs well, if it causes your vehicle to exceed the permissible emission levels for its year and class, it will fail the emissions test.
What Makes a Cammed Car Illegal?
A cammed car becomes illegal in California if:
- The aftermarket camshaft does not have a CARB Executive Order (EO) number for that specific vehicle and engine combination.
- The modification removes or disables any factory emissions control equipment.
- The modified camshaft (or other related parts) causes the vehicle to fail its smog check, either visually or during the emissions test.
- The camshaft change is part of a larger modification that fundamentally alters the engine's emissions characteristics without proper certification.
Practical Considerations for Modifying Your Car
If you are considering modifying your car's camshaft or other engine components in California, here are some essential steps:
- Research Thoroughly: Before purchasing any aftermarket part, verify its CARB legality. Look for an EO number on the part itself or its packaging, and cross-reference it on the CARB website.
- Consult Reputable Shops: Work with performance shops that are knowledgeable about California's emissions laws and can install only CARB-compliant parts.
- Keep Documentation: Retain all documentation, including receipts and CARB EO numbers, for any aftermarket parts installed. This can be helpful during smog checks.
In summary, while installing an aftermarket camshaft is not automatically illegal, it must adhere to California's strict emissions standards and be certified by CARB or EPA for your specific vehicle to remain legal for street use.
[[California Vehicle Modifications]]
