Are Cammed Cars Illegal?
The answer is complex, and it all depends on the specific modification, the type of cam installed, and the vehicle itself. California law provides more restrictive rules and regulations, and a cammed car must be certified by the California Air Resources Board (CARB) to be compliant with emissions standards.
In California, cam modifications must adhere to specific standards outlined by CARB to be considered legal. One notable exception is the header regulation, which prohibits manufacturers from producing aftermarket exhaust systems that amplify the sound output above the factory specifications (Figure 1).
Figure 1: Noise Control Regulation
| Noise Level (dBC) | Measurement Conditions |
|---|---|
| 74 ± 3 dB(Sound Pressure Level) | |
| 78.2 ± 3 dBe(A-Weighting Filter) |
Table: Noise Control Regulation Standard for California
In most states, cammed cars may be legal as long as they do not cause excessive noise disturbance, do not compromise road safety, and do not negatively impact the environment (Air Quality). However, many jurisdictions have specific no-noise bylaws or ordinances that impose severe penalties for excessive sound emission.
Federal Requirements:
The Noise Control Act of 1972 sets federal limits on vehicle noise levels at 80 dBA or lower. The federal noise regulation applies to newly manufactured vehicles, and dealers must ensure compliance before distributing these vehicles to the market. Existing vehicles, regardless of age, are excluded from these regulations.
Key highlights:
- Off-the-shelf engines generally do not require permits to install aftermarket cams for race or street use as long as they do not disturb the peace or break any local noise rules.
- Professional tuner shops may specialize in modifying engines for the local market, ensuring compatibility with regional noise regulations while producing optimal horsepower for racers.
CARB certification
In California, owners installing aftermarket cams must guarantee CARB certification for all the components involved in the upgrade. This includes performance gains, noise levels, and emissions compliance. Many tuning shops offer performance modification packages that carry this certification, ensuring safety, efficiency, and conformance to regulations.
Summary: Cammed Cars Legality
- Depends on the specific modification (Camshaft, headers, intake, etc.)
- Certification by CARB ensures legality in California
- Must adhere to noise controls regulation
- Federal requirement set at 80 dBA or lower
- Most states allow cam modifications provided they do not: noise disturbance, compromise safety, or harm the environment (Air Quality)
Off-the-shelf engines rarely need permits for aftermarket tuning provided they do not disobey local noise rules; tuner shops can modify the local market with certified results.
Performance modification packages guaranteed under CARB certification carry assurances of safety, performance gains, and emissions compliancy.
Last Edit: This article offers crucial information for car owners or enthusiasts planning to engage with cammed cars legally and safely. It encompasses information from federal and CARB regulations, noise limits, and state-specific allowances.
Please note that modifications in some states may allow flexibility, but it always recommend consulting local authorities on your specific situation. Furthermore, some jurisdictions may maintain exceptions or exemptions for street rods, vintage vehicles, or racing purposes. Familiarize yourself with all pertinent regulations and consult licensed technicians or authorities before upgrading or modifying your vehicle.
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