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50-479: In 1952, a car club known as the "Choppers of Pomona" aided by a young police officer, Sergeant Bud Coons, advocated that a safe place should be provided for local area drag racers. Coons, along with fellow hot rod enthusiast, Pomona Police Chief Ralph Parker, and the city government of Pomona asked to lease the parking lot of the LA County Fairgrounds. Coons and Parker were instrumental in convincing

100-411: A pushrod which transfers the motion to the top of the engine, where a rocker opens the intake/exhaust valve. Although largely replaced by SOHC and DOHC layouts in modern automobile engines, the older overhead valve layout is still used in many industrial engines, due to its smaller size and lower cost. As engine speeds increased through the 20th century, single overhead camshaft (SOHC) engines— where

150-561: A slide valve . Camshafts more like those seen later in internal combustion engines were used in some steam engines, most commonly where high pressure steam (such as that generated from a flash steam boiler ), required the use of poppet valves, or piston valves. For examples see the Uniflow steam engine , and the Gardner-Serpollet steam cars, which also included axially sliding the camshaft to achieve variable valve timing. Among

200-403: A two-stroke engine that uses a camshaft, each valve is opened once for every rotation of the crankshaft; in these engines, the camshaft rotates at the same speed as the crankshaft. In a four-stroke engine , the valves are opened only half as often, therefore the camshaft is geared to rotate at half the speed of the crankshaft. The camshaft's duration determines how long the intake/exhaust valve

250-479: A Ford or Mercury flathead, with an Edelbrock intake manifold , Harman and Collins magneto , and Halibrand quick-change differential . Front suspension hairpins were adapted from sprint cars , such as the Kurtis Krafts . As hot rodding became more popular, magazines and associations catering to hot rodders were started, such as the magazine Hot Rod , founded in 1948. As automobiles offered by

300-409: A camshaft are usually either: Many early internal combustion engines used a cam-in-block layout (such flathead , IOE or T-head layouts), whereby the camshaft is located within the engine block near the bottom of the engine. Early flathead engines locate the valves in the block and the cam acts directly on those valves. In an overhead valve engine, which came later, the cam follower presses on

350-402: A different RPM range. Advancing the camshaft (shifting it to ahead of the crankshaft timing) increases low RPM torque, while retarding the camshaft (shifting it to after the crankshaft) increases high RPM power. The required changes are relatively small, often in the order of 5 degrees. Modern engines which have variable valve timing are often able to adjust the timing of the camshaft to suit

400-503: A hammer used in forging or to pound grain. Evidence for these exists back to the Han dynasty in China, and they were widespread by the medieval period. Once the rotative version of the steam engine was developed in the late 18th century, the operation of the valve gear was usually by an eccentric , which turned the rotation of the crankshaft into reciprocating motion of the valve gear, normally

450-471: A hot rod as any motorized vehicle that has a replacement engine differing from the factory original. The forerunners to the hotrod were the modified cars used in the Prohibition era by bootleggers to evade revenue agents and other law enforcement. Hot rods first appeared in the late 1930s in southern California , where people raced modified cars on dry lake beds northeast of Los Angeles , under

500-483: A number of cams (discs with protruding cam lobes ) along its length, one for each valve. As the cam rotates, the lobe presses on the valve (or an intermediate mechanism), thus pushing it open. Typically, a valve spring is used to push the valve in the opposite direction, thus closing the valve once the cam rotates past the highest point of its lobe. Camshafts are made from metal and are usually solid, although hollow camshafts are sometimes used. The materials used for

550-403: A particular purpose, such as "hot-rodded amplifier ". There are various theories about the origin of the term "hot rod". The common theme is that "hot" related to "hotting up" a car, which means modifying it for greater performance. With regards to the word "rod", one theory is that it means roadster , a lightweight 2-door car which was often used as the basis for early hot rods. Another theory

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600-420: A steeper camshaft profile is required, which increases the forces needed to open the valve. A related issue is valve float at high RPM, where the spring tension does not provide sufficient force to either keep the valve following the cam at its apex or prevent the valve from bouncing when it returns to the valve seat. This could be a result of a very steep rise of the lobe, where the cam follower separates from

650-414: A wider LSA to compensate for excessive duration can reduce power and torque outputs. In general, the optimal LSA for a given engine is related to the ratio of the cylinder volume to intake valve area. Camshafts are integral components of internal combustion engines, responsible for controlling the opening and closing of the engine's intake and exhaust valves. As the camshaft rotates, its lobes push against

700-482: Is no definition of the term that is universally accepted and the term is attached to a wide range of vehicles. Most often they are individually designed and constructed using components from many makes of old or new cars, and are most prevalent in the United States and Canada. Many are intended for exhibition rather than for racing or everyday driving. The origin of the term "hot rod" is unclear. Some say that

750-582: Is often used as a standard measurement procedure, since this is considered most representative of the lift range that defines the RPM range in which the engine produces peak power. The power and idle characteristics of a camshaft with the same duration rating that has been determined using different lift points (for example 0.006 or 0.002 inches) could be much different to a camshaft with a duration rated using lift points of 0.05 inches. A secondary effect of increased duration can be increased overlap , which determines

800-430: Is open for, therefore it is a key factor in the amount of power that an engine produces. A longer duration can increase power at high engine speeds (RPM), however this can come with the trade-off of less torque being produced at low RPM. The duration measurement for a camshaft is affected by the amount of lift that is chosen as the start and finish point of the measurement. A lift value of 0.050 in (1.3 mm)

850-569: Is that "rod" refers to camshaft , a part of the engine which was often upgraded in order to increase power output. In the early days, a car modified for increased performance was called a "gow job". This term morphed into the hot rod in the early to late 1940s. The term "hot rod" has had various uses in relation to performance cars. For example, the Ontario Ministry of the Environment in its vehicle emissions regulations refers to

900-440: Is usually referred to as a double overhead camshaft engine (although colloquially they are sometimes referred to as "quad-cam" engines). Accurate control of the position and speed of the camshaft is critically important in allowing the engine to operate correctly. The camshaft is usually driven either directly, via a toothed rubber "timing belt"' or via a steel roller "timing chain". Gears have also occasionally been used to drive

950-515: Is very little "vintage tin", the hot rods in Sweden are generally made with a home-made chassis (usually a Model T or A replica), with a Jaguar (or Volvo 240 ) rear axle, a small-block V8 , and fiberglass tub, but some have been built using for instance a Volvo Duett chassis. Because Swedish regulations required a crash test even for custom-built passenger cars between 1969 and 1982, the Duett option

1000-661: The Ford flathead V8 engine (known as the "flatty") into a different car, for example, the common practice in the 1940s of installing the "60 horse" version into a Jeep chassis. Typical modifications were removal of convertible tops , hoods , bumpers , windshields , and/or fenders ; channeling the body; and modifying the engine by tuning and/or replacing with a more powerful type. Wheels and tires were changed for improved traction and handling. Hot rods built before 1945 commonly used '35 Ford wire-spoke wheels . After World War II , many small military airports throughout

1050-449: The greaser lifestyle. Magazines like Ol' Skool Rodz , Gears and Gals , and Rat-Rods and Rust Queens cover events and people. There are magazines that feature traditional hot rods, including Hot Rod , Car Craft , Rod and Custom , and Popular Hot Rodding . There are also television shows such as My Classic Car , Horsepower TV , American Hot Rod , Fast and Loud , and Chop Cut Rebuild . Particularly during

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1100-487: The Lobe Separation Angle is increased to compensate. A lay person can readily spot a long duration camshaft by observing the broad surface of the lobe where the cam pushes the valve open for a large number of degrees of crankshaft rotation. This will be visibly greater than the more pointed camshaft lobe bump that is observed on lower duration camshafts. The camshaft's lift determines the distance between

1150-412: The RPM of the engine at any given time. This avoids the above compromise required when choosing a fixed cam timing for use at both high and low RPM. The lobe separation angle (LSA, also called lobe centreline angle ) is the angle between the centreline of the intake lobes and the centreline of the exhaust lobes. A higher LSA reduces overlap, which improves idle quality and intake vacuum, however using

1200-407: The cam lobe (due to the valvetrain inertia being greater than the closing force of the valve spring), leaving the valve open for longer than intended. Valve float causes a loss of power at high RPM and in extreme situations can result in a bent valve if it gets struck by the piston. The timing (phase angle) of the camshaft relative to the crankshaft can be adjusted to shift an engine's power band to

1250-458: The camshaft is located within the cylinder head near the top of the engine— became increasingly common, followed by double overhead camshaft (DOHC) engines in more recent years. For OHC and DOHC engines, the camshaft operates the valve directly or via a short rocker arm. The valvetrain layout is defined according to the number of camshafts per cylinder bank. Therefore, a V6 engine with a total of four camshafts - two camshafts per cylinder bank -

1300-540: The camshaft. In some designs the camshaft also drives the distributor , oil pump , fuel pump and occasionally the power steering pump. Alternative drive systems used in the past include a vertical shaft with bevel gears at each end (e.g. pre-World War I Peugeot and Mercedes Grand Prix Cars and the Kawasaki W800 motorcycle) or a triple eccentric with connecting rods (e.g. the Leyland Eight car). In

1350-424: The country were either abandoned or rarely used, allowing hot rodders across the country to race on marked courses. Originally, drag racing had tracks as long as 1 mi (1.6 km) or more, and included up to four lanes of racing simultaneously. As some hot rodders also raced on the street, a need arose for an organization to promote safety, and to provide venues for safe racing. The National Hot Rod Association

1400-496: The county to allow the use of the fairgrounds for the race by citing statistics that indicated deaths among kids declined sharply when given a supervised place to race. The county finally agreed, as long as the hot rodders would provide their own insurance, which they were able to do with gate receipts. At the time the county made the agreement, the parking lot was nothing but a gravel lot. The coalition of hot rodders, police and community leaders raised funds through donations and paved

1450-628: The decade passed. Hot rods were used as the theme of Lightning Rod , a Rocky Mountain Construction roller coaster at Dollywood . Locals in Sweden and Finland , influenced by American culture, have created a vibrant local hot rod culture where enthusiasts gather at meetings such as Power Big Meet in Linköping and clubs like Wheels and Wings in Varberg , both located in Sweden. Since there

1500-436: The distance that the valve opens (the valve lift ) is greater than the distance from the peak of the camshaft's lobe to the base circle (the camshaft lift ). There are several factors which limit the maximum amount of lift possible for a given engine. Firstly, increasing lift brings the valves closer to the piston, so excessive lift could cause the valves to get struck and damaged by the piston. Secondly, increased lift means

1550-465: The early 1960s, a genre of "hot rod music" rose to mainstream popularity. Hot rod music was largely a product of a number of surf music groups running out of ideas for new surfing songs and simultaneously shifting their lyrical focus toward hot rods. Hot rod music would prove to be the second phase in a progression known as the California Sound , which would mature into more complex topics as

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1600-557: The event was sponsored by Winston (after NHRA's main title sponsor at the time, RJ Reynolds' "Winston" cigarette brand). From 2010 to 2019, and again from 2021 to 2022, the event was sponsored by the Automobile Club of Southern California , which is affiliated with AAA. The 2020 event was sponsored by Stellantis and Royal Dutch Shell when it was held at Las Vegas Motor Speedway because Clark County, Nevada allowed spectators when California still banned mass gatherings because of

1650-522: The first cars to utilize engines with single overhead camshafts were the Maudslay, designed by Alexander Craig and introduced in 1902 and the Marr Auto Car designed by Michigan native Walter Lorenzo Marr in 1903. In piston engines , the camshaft is used to operate the intake and exhaust valves . The camshaft consists of a cylindrical rod running the length of the cylinder bank with

1700-485: The global pandemic . Beginning in 2023, In-N-Out Burger will become naming rights sponsor for both the circuit and the NHRA Finals. From 1934 to 1937 a 1 ⁄ 2 mile dirt oval was located at the facility. The dirt oval was once again opened in the 1950s but closed in 1959. Pomona was also home to a 1.7 mile paved road course which operated in 1998 and 1999. From 1956 to 1961, a 2-mile temporary road course

1750-411: The intake and exhaust valves), mechanically controlled ignition systems and early electric motor speed controllers . Camshafts in piston engines are usually made from steel or cast iron, and the shape of the cams greatly affects the engine's characteristics. Trip hammers are one of the early uses of a form of cam to convert rotating motion, e.g. from a waterwheel, into the reciprocating motion of

1800-400: The length of time that both the intake and exhaust valves are open. It is overlap which most affects idle quality, in as much as the "blow-through" of the intake charge immediately back out through the exhaust valve which occurs during overlap reduces engine efficiency, and is greatest during low RPM operation. In general, increasing a camshaft's duration typically increases the overlap, unless

1850-574: The lot. This was the birth of the dragstrip in Pomona. Though it was not considered a national event by today's standards, the very first NHRA event, the Southern California Championships, was held at this dragstrip on an April weekend in 1953. On Saturday, attendance was at two or three thousand and attendance was reported to be at 15,000 on Sunday. Compared to the 3.9 second numbers (at 333 yd 1 ft (304.80 m)

1900-406: The major automakers began increasing performance, the lure of hot rods began to wane. With the advent of the muscle car , it was now possible to purchase a high-performance car straight from the showroom. However, the 1973 Oil Crisis caused car manufacturers to focus on fuel efficiency over performance, which led to a resurgence of interest in hot rodding. As the focus shifted away from racing,

1950-593: The modified cars became known as "street rods". The National Street Rod Association (NSRA) was formed and began hosting events. By the 1970s, the 350 cu in (5.7 L) small-block Chevy V8 was the most common choice of engine for hot rods. Another popular engine choice is the Ford Windsor engine . During the 1980s, many car manufacturers were reducing the displacements of their engines, thus making it harder for hot rod builders to obtain large displacement engines. Instead, engine builders had to modify

2000-556: The pros are putting on the board presently, the best ET of that day was a respectable 10.93. In 1961, NHRA held its first ever Winternationals at the Pomona Raceway. It became NHRA's second national event. The first NHRA national event was the U.S. Nationals, which was nicknamed the "Big-Go". Thus, the Winternationals got nicknamed the "Big-Go West". It has remained at this location ever since. For many years, this event

2050-574: The rules of the Southern California Timing Association (SCTA), among other groups. This gained popularity after World War II , particularly in California, because many returning soldiers had received technical training. The first hot rods were old cars (most often Fords , typically 1910s-1920s Model Ts , 1928–31 Model As , or 1932-34 Model Bs ), modified to reduce weight. Engine swaps often involved fitting

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2100-459: The smaller engines (such as using non-standard crankshafts and pistons ) to obtain larger displacement. While current production V8s tended to be the most frequent candidates, this also applied to others. In the mid-1980s, as stock engine sizes diminished, rodders discovered the 215 cu in (3.5 L) aluminum-block Buick or Oldsmobile V8 could be modified for substantially greater displacement, with mainly wrecking yard parts. This trend

2150-555: The term "hot" refers to the vehicle's being stolen. Other origin stories include replacing the engine's camshaft or "rod" with a higher performance version. According to the Hot Rod Industry Alliance (HRIA), the term changes in meaning over the years, but "hot rodding has less to do with the vehicle and more to do with an attitude and lifestyle". For example, hot rods were favorites for greasers . The term has broadened to apply to other items that are modified for

2200-404: The valve and the valve seat (i.e. how far open the valve is). The farther the valve rises from its seat the more airflow can be provided, thus increasing the power produced. Higher valve lift can have the same effect of increasing peak power as increased duration, without the downsides caused by increased valve overlap. Most overhead valve engines have a rocker ratio of greater than one, therefore

2250-483: The valves, allowing the intake of air and fuel and the expulsion of exhaust gases. This synchronized process is crucial for optimizing engine performance, fuel efficiency, and emissions control. Without precisely engineered camshafts, the smooth and efficient operation of an engine would be compromised. The most common methods of valve actuation involve camshafts and valve springs, however alternate systems have occasionally been used on internal combustion engines: Before

2300-551: Was founded in 1951, to take drag racing off the streets and into controlled environments. In the '50s and '60s, the Ford flathead V8 was supplanted by the Chrysler FirePower engine (known as the "early hemi"). Many hot rods would upgrade the brakes from mechanical to hydraulic ("juice") and headlights from bulb to sealed-beam. A typical mid-1950s to early 1960s custom Deuce was fenderless and steeply chopped, powered by

2350-713: Was located in the parking lot. Note: In 2021 The race was postponed due to COVID-19 until July 30 - August 1, 2021. NOTE: The Finals has been held in the Southwest area from 1965 to 1973, the Los Angeles metropolitan area from 1974 to 2019, and again since 2021, and Las Vegas in 2020. Hot rod Hot rods are typically American cars that might be old, classic, or modern and that have been rebuilt or modified with large engines optimized for speed and acceleration. One definition is: "a car that's been stripped down, souped up and made to go much faster." However, there

2400-550: Was not limited to American cars; Volkswagen enthusiasts similarly stretched stock 1600cc engines to over two liters. The hot rod community has now been subdivided into two main groups: street rodders and hot rodders. There is a contemporary movement of traditional hot rod builders, car clubs and artists who have returned to the roots of hot rodding as a lifestyle. This includes a new breed of traditional hot rod builders, artists, and styles, as well as classic style car clubs. Events like GreaseOrama feature traditional hot rods and

2450-500: Was preferred, since it was considered a rebodied Duett rather than a new vehicle. Some 1950s and 1960s cars are also hot rodded, like Morris Minor , Ford Anglia , Volvo Amazon , Ford Cortina , and '57 Chevy , to name but a few. These are known as custom cars (sometimes spelled Kustom). Camshaft A camshaft is a shaft that contains a row of pointed cams in order to convert rotational motion to reciprocating motion . Camshafts are used in piston engines (to operate

2500-427: Was sponsored by Chief Auto Parts and later its successor AutoZone , but later was sponsored by CSK Automotive, and now its current successor, O'Reilly Auto Parts . 2008 saw Top fuel & funny car races be reduced to the present 1000 feet. The season closer, the NHRA Finals, was brought to the facility in 1984 from the now defunct Orange County International Raceway . When the event was first brought to Pomona,

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