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A Boss 302 engine with the optional factory shaker scoop.

A shaker scoop (sometimes called a shaker hood scoop or a shaker hood) is an automobile term for an air intake for combustion air that is mounted directly on top of the engine's air cleaner and protrudes through a hole in the hood. Since it is fastened directly to the engine, it moves with the engine's movement and vibration on its mountings, thus the 'shaker' name.

Design

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Like all such scoops, its purpose is to increase performance by a 'ram air' effect, taking advantage of the vehicle's speed to deliver high pressure, cool air to the engine over a shorter, less restrictive flow path.[1] However, because engines draw air in hundreds of cubic feet per minute, scoops do not raise intake pressures significantly.[2] Additional claimed benefits of a shaker hood include elevation to prevent water from being drawn on flooded terrain, being a source of cooler, denser air, and having a more direct path to the engine's throttle plate.[1]

Aftermarket

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1968 AMX with aftermarket supercharger and blower scoop

Hot rod and drag race enthusiasts have modified automotive engines to increase power via supercharger forced induction since the 1920s; in some cases, a blower scoop is added to the top of the supercharger as an aid to air intake.

A vehicle also can be equipped with an aftermarket engine-mounted scoop that is mounted directly to the carburetor and protrudes through the hood, which is known as a carb scoop. Carb scoops are sometimes mistaken for blower scoops, but the presence (or lack) of a belt to drive the supercharger is one way to distinguish these scoops. Both carb and blower scoops are sometimes called bugcatchers. Like the shaker scoop, both a blower scoop and a carb scoop will vibrate in response to engine motions because they are attached to the engine.

Some aftermarket scoops include butterfly valves, which act as secondary throttle bodies.[3]

Factory-fitted

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Larry Shinoda of Ford is credited with introducing the shaker hood scoop as a factory-fitted option and campaigning to make it functional, first available exclusively for the 1969 model year Mustang equipped with the 428 Cobra Jet engine;[4] the option was expanded to other Ford Mustang engines for 1970 and imitated quickly by competitors Chrysler (1970 Plymouth 'cuda and Dodge Challenger) and Pontiac (19701⁄2 Firebird Trans Am, which used a backwards-facing scoop to draw air from the high-pressure area at the base of the windshield).[5] Some official Chrysler literature referred to this popular hood style as the "Incredible Quivering Exposed Cold Air Grabber".[6] This lengthy title has since been shortened by enthusiasts and collectors to the less tongue-twisting "shaker hood".

In the 2000s, factory-fitted shaker scoops were reintroduced with the 2003 Ford Mustang Mach 1[7][8] and 2014 Dodge Challenger ("Shaker" and "Mopar" models).[2][9] The 2003–04 Mustang Mach 1 was equipped with a model-specific 32-valve 4.6 L V-8 engine,[10] to fill the performance gap between the less-powerful Mustang GT and the flagship Mustang SVT Cobra.[11] For the 2014 model year, Dodge announced the shaker scoop Challengers as limited-production models at the SEMA show in November 2013;[12] shaker scoop availability was extended in 2015.[13] The shaker package was available through the 2023 model year,[14] when the Challenger was discontinued.[15]

Examples

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Such scoops were fitted to a variety of cars, including:

References

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  1. ^ a b Fernie, Michael (2016). "What is a shaker hood and how do they work?". Car Throttle. Retrieved 27 October 2022.
  2. ^ a b Raynal, Wes; Kozak, Graham; Lingeman, Jake (October 6, 2014). "2014 Dodge Challenger R/T Shaker review notes". Autoweek. Retrieved 27 October 2022. What's the point of the Shaker hood? I dunno -- what has the point of a Shaker hood ever been? The performance advantages are debatable, so I guess you buy one because you think it looks cool.
  3. ^ "Air Scoops". Holley Performance Products. Retrieved 27 October 2022.
  4. ^ Shaw, Tom (September 21, 2016). "Show-Quality Shaker Hood Scoop Detailing". Motor Trend. Retrieved 27 October 2022.
  5. ^ O'Clair, Jim (September 24, 2018). "Shaker-Style Hood Scoops". Hemmings. Retrieved 27 October 2022.
  6. ^ "1970 Dodge Charger (brochure)". Chrysler Motor Corporation. 1970.
  7. ^ "2003 Ford Mustang Mach 1". Ford Performance. Retrieved 27 October 2022.
  8. ^ "2004 Ford Mustang Mach 1". Ford Performance. Retrieved 4 December 2024.
  9. ^ Stoklosa, Alexander (November 5, 2013). "Dodge Declares 2014 the Year of the Challenger, Introduces Shaker and Mopar '14 Models [2013 SEMA Show]". Car and Driver. Retrieved 4 December 2024.
  10. ^ Shea, Terry (March 22, 2024). "It's Almost a Classic: 2003-'04 Ford Mustang Mach 1". Hemmings. Retrieved 4 December 2024.
  11. ^ Keebler, Jack; Freers, David (photographer) (January 17, 2003). "2003 Ford Mustang Mach 1". Motor Trend. Retrieved 4 December 2024.
  12. ^ "HEMI 'Shaker' Returns — 2014 Challenger R/T and Mopar '14 Challenger Models Deliver Power, Performance and Even More Heritage-inspired Style For Hardcore Dodge and Mopar Enthusiasts". Stellantis North America Media (Press release). November 5, 2013. Retrieved 4 December 2024.
  13. ^ Blackwell, Rusty (February 17, 2015). "What's Shakin'? Dodge Announces and Prices New Shaker Challengers". Car and Driver. Retrieved 4 December 2024.
  14. ^ "2023 Dodge Challenger (brochure" (PDF). Fiat Chrysler Automobiles US, LLC. Retrieved 4 December 2024.
  15. ^ Miller, Caleb (December 27, 2023). "The Last 2023 Dodge Challenger and Charger Have Been Built". Car and Driver. Retrieved 4 December 2024.
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