Question about v-tech
#13
01-19-2007, 07:06 PM
RE: Question about v-tech
ORIGINAL: johnnyGofast
V-tech is a phone. Lol. If its VTEC shouldnt it say it on the front. Thats like having HEMI without having 4500 emblems on it. Lol..Cept VTEC aint hemi
V-tech is a phone. Lol. If its VTEC shouldnt it say it on the front. Thats like having HEMI without having 4500 emblems on it. Lol..Cept VTEC aint hemi
#15
01-20-2007, 01:06 AM
RE: Question about v-tech
it is a hemi look and see
Hemi (from "hemisphere") or "crossflow cylinder head" is a design of internal-combustion engines in which the cylinder head's combustion chamber is of hemispherical form. The term, "Hemi engine" is a trademark of Chrysler Corporation, though the concept is used by many manufacturers.
The BMW double push rod design, taken over by Bristol Cars, the Peugeot 403 and the Toyota T engine are other well known examples. Harry Arminius Miller racing engines were a more notable example. Stutz had built four valve engines, resembling modern car engines. Chrysler became synonymous with the "Hemi" by building them in such large numbers.
The hemispherical combustion chamber design puts the intake/exhaust valves in-line, rather than side-by-side, allowing for better flow of air through the head (although the inlet and exhaust valves are not simultaneously open and there is no continuous flow). The spark plug in the center of the chamber makes for better ignition of the fuel/air mixture. These aspects help make the hemi-type engine more efficient and powerful, and less prone to engine knock.
The hemispherical cylinder head increases the engine's efficiency through reduced thermal energy loss and increased airflow through the engine. (A hemisphere has the lowest surface area to volume ratio, meaning the most space for combustion while losing the least amount of energy to the engine walls.) Drawbacks such as increased production cost have meant that it has been a rare design. Placing the intake on the opposite side of the engine also reduces the air intake temperature and increases efficiency.
Hemispherical cylinder heads have been used in some engines since they were first used by the Belgian car maker Pipe in 1905. Most applications have been in higher-priced luxury or sporting vehicles, because the hemi design is more expensive to build.
Perhaps the best-known proponent of the Hemi design has been the Chrysler Corporation, which has produced three generations of such engines: the first (the Chrysler FirePower engine) in the 1950s; the second (the 426 Hemi) from the mid 1960s through the mid 1970s; and finally in the early 2000s. Chrysler has used the word "Hemi" extensively in its advertising, to the extent that the word is indelibly associated with Chrysler in North America.
Porsche has also been a notable user of the Hemi design, generating up to 86hp per liter displacement on production cars (1973 2.4L 911S), and even more on racing engines (906 Carrera engine). Jaguar used this head design as well on the legendary XK engines, which powered cars ranging from the Le Mans winning D-Type to the XJ6 sedan.
Other manufacturers used the hemispherical design before World War II, including Daimler and Riley.
Hemi (from "hemisphere") or "crossflow cylinder head" is a design of internal-combustion engines in which the cylinder head's combustion chamber is of hemispherical form. The term, "Hemi engine" is a trademark of Chrysler Corporation, though the concept is used by many manufacturers.
The BMW double push rod design, taken over by Bristol Cars, the Peugeot 403 and the Toyota T engine are other well known examples. Harry Arminius Miller racing engines were a more notable example. Stutz had built four valve engines, resembling modern car engines. Chrysler became synonymous with the "Hemi" by building them in such large numbers.
The hemispherical combustion chamber design puts the intake/exhaust valves in-line, rather than side-by-side, allowing for better flow of air through the head (although the inlet and exhaust valves are not simultaneously open and there is no continuous flow). The spark plug in the center of the chamber makes for better ignition of the fuel/air mixture. These aspects help make the hemi-type engine more efficient and powerful, and less prone to engine knock.
The hemispherical cylinder head increases the engine's efficiency through reduced thermal energy loss and increased airflow through the engine. (A hemisphere has the lowest surface area to volume ratio, meaning the most space for combustion while losing the least amount of energy to the engine walls.) Drawbacks such as increased production cost have meant that it has been a rare design. Placing the intake on the opposite side of the engine also reduces the air intake temperature and increases efficiency.
Hemispherical cylinder heads have been used in some engines since they were first used by the Belgian car maker Pipe in 1905. Most applications have been in higher-priced luxury or sporting vehicles, because the hemi design is more expensive to build.
Perhaps the best-known proponent of the Hemi design has been the Chrysler Corporation, which has produced three generations of such engines: the first (the Chrysler FirePower engine) in the 1950s; the second (the 426 Hemi) from the mid 1960s through the mid 1970s; and finally in the early 2000s. Chrysler has used the word "Hemi" extensively in its advertising, to the extent that the word is indelibly associated with Chrysler in North America.
Porsche has also been a notable user of the Hemi design, generating up to 86hp per liter displacement on production cars (1973 2.4L 911S), and even more on racing engines (906 Carrera engine). Jaguar used this head design as well on the legendary XK engines, which powered cars ranging from the Le Mans winning D-Type to the XJ6 sedan.
Other manufacturers used the hemispherical design before World War II, including Daimler and Riley.
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