Listen to these cammed hemi mopars with #moparbro fred_eazy21!
In this episode we listen to a dodge ram 1500 comp cammed 5.7L hemi, a dodge charger r/t cammed 5.7L hemi, a dodge challenger r/t cammed 5.7L hemi, a chrysler 300 srt8 with a cammed 6.4L 392 hemi as well as a dodge charger srt8 6.4L hemi.
A cammed Hemi engine is known for its distinctive and aggressive sound, which enthusiasts often describe as a deep, throaty rumble with a pronounced lope at idle. This sound is a result of the camshaft modification, which alters the valve timing and increases the engine's performance, especially in terms of horsepower and torque. The sound can vary based on the specifics of the camshaft grind, the exhaust system, and other engine modifications, but generally, it has the following characteristics:
Deep Idle Lope: The cammed Hemi has a noticeable lope at idle due to the increased overlap in valve timing. This creates a rhythmic, pulsating sound that is much rougher than a stock engine.
Aggressive Acceleration: When you rev the engine or accelerate, the sound becomes more aggressive and louder, often described as a roar or growl. This is due to the increased airflow and the engine's higher RPM capability.
Exhaust Note: The exhaust system plays a significant role in shaping the sound. Headers, high-flow catalytic converters, and performance mufflers can amplify the deep, rumbling sound of the cammed Hemi.
Distinctive Performance Sound: Overall, the cammed Hemi has a sound that signifies performance and power, making it popular among muscle car enthusiasts and racers.
Performance Statistics for Aftermarket Camshafts in Hemi Engines
Horsepower Gains:
Mild Cams: Typically, mild cams designed for street performance can yield gains of 20-40 horsepower over the stock camshaft.
Moderate Cams: Mid-level performance cams can provide gains of 40-70 horsepower. These cams often require supporting mods like improved intake and exhaust systems.
Aggressive Cams: Racing-oriented camshafts can deliver over 100 horsepower gains but often require extensive engine modifications and tuning.
Torque Improvements:
Torque gains usually follow a similar trend to horsepower, with mild cams adding 20-30 lb-ft, moderate cams adding 30-60 lb-ft, and aggressive cams potentially adding 70 lb-ft or more, depending on other engine modifications.
Powerband Changes:
Low-End Power: Mild cams can enhance low-end torque, making the vehicle more responsive at lower RPMs. These are good for street driving and daily use.
Mid-Range Power: Moderate cams typically improve mid-range performance, providing a strong pull from mid to high RPMs, suitable for more spirited driving.
High-End Power: Aggressive cams shift the powerband higher, enhancing high-RPM horsepower, ideal for track and racing applications.
Examples of Popular Aftermarket Cams for Hemi Engines
Comp Cams Thumpr Series:
Known for providing a significant boost in power while delivering an aggressive exhaust note.
Horsepower gains can be in the range of 40-60 HP with appropriate supporting mods.
Mopar Performance Camshafts:
Designed specifically for Dodge/Chrysler Hemi engines.
Can provide a balanced increase in both horsepower and torque, often in the range of 30-50 HP and similar torque gains.
Texas Speed & Performance Camshafts:
Offer a variety of camshaft profiles for different performance needs, from mild street cams to aggressive race cams.
Potential horsepower gains from 30 HP to over 100 HP, depending on the cam profile and
Example Performance Results
A common example might include a 6.4L Hemi engine equipped with a moderate camshaft upgrade, along with an aftermarket intake, headers, and a custom tune. Such a setup could see:
Stock Horsepower: 485 HP
Aftermarket Camshaft: 550-575 HP
Torque Improvement: An increase of 50-60 lb-ft over stock
1. 5.7L Hemi (2003-2008)
Comp Cams XFI 273: Good for street performance with a noticeable increase in power without sacrificing drivability.
Arrington Performance: Offers various cams for different stages of performance, from mild to extreme.
2. 5.7L Hemi (2009-Present)
Comp Cams 274: Provides a good balance between daily drivability and performance.
Mopar Performance Hellcat Camshaft: A high-performance option for those looking for significant gains.
3. 6.1L Hemi (2005-2010)
Comp Cams 268: Excellent for improved power while maintaining drivability.
Arrington Performance SR-2: For more aggressive performance, suitable for racing applications.
4. 6.2L Hellcat Hemi
HHP Stage 2: Ideal for Hellcat engines, providing significant horsepower and torque gains.
Green Racing Stage 3: A more aggressive option for extreme performance upgrades.
5. 6.4L (392) Hemi
Comp Cams 274: Offers a substantial increase in power with good street manners.
Arrington Performance: Various cams designed for different levels of performance enhancement.
Key Considerations:
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