multivalve

"The cost of building multivalve engines is lower in Japan.

From 1987 there have also been Ducati multivalve motorcycles.

Cadillac took the wraps off a powerful new multivalve engine, the Northstar, today.

Mr. Miles acknowledged the superior efficiency of multivalve engines, but said it comes at a cost.

If there is a leak in the multivalve area any escaped gas will be automatically vented to the outside air below the car.

This ability, in theory, removes one of the main reservations of American car makers about the multivalve engine.

The production version will feature a multi-cam multivalve computer controlled engine of approximately 300 horsepower.

"It is as much a breakthrough as mass produced twin cam multivalve technology was a decade and a half ago."

Honda was among the first car makers to promote multivalve engines, which have three or more valves for each cylinder, rather than the conventional two.

But turbochargers seemed to be the quick fix, and I'd sure like to see more sophisticated engines from America by way of home-spun multivalve technology.

They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve.

Most recent DOHC engines are multivalve, with between three and five valves per cylinder.

The multivalve fits in the hole in the body of the tank and is bolted down with a sealing ring to prevent gas leakage.

Difficult to Repair Multivalve engines are also more expensive to make and can be more difficult to repair.

Aware of those advantages, General Motors, Ford and Chrysler are each pursuing new multivalve engine programs.

G.M.'s Design G.M. is the only American car company that makes a multivalve engine for use in this country.

For those and other reasons, G.M. rejected multivalve technology for its current line of six-cylinder Buick engines, he said.

Like the videocassette recorder and the facsimile machine, the multivalve engine was invented in America but commercialized in Japan.

Although it did not produce as much horsepower as a multivalve design would, the two-valve GS500 engine had proportionally more torque at low speeds.

Cost is why a sophisticated overhead-camshaft multivalve engine, used in virtually all other sports cars except the intentionally fusty Dodge Viper, was not seriously considered.

Currently, the only 16-valve engine in Vauxhall's range is the 150bhp two litre, which leaves Ford, with its new Zeta multivalve fours, a step ahead.

DOHC with a multivalve design also allows for the optimum placement of the spark plug which, in turn, improves combustion efficiency.

A brand-new development for the Safrane is an air-jet inlet system which improves low-speed operation and stabilises idling of multivalve engines.

This is accomplished automatically as the tank multivalve cuts off the fuel supply from the dispenser when the level of Autogas in the tank reaches 80%.

Both units feature multivalve technology for additional smoothness and refinement and incorporate new spark plugs which have doubled replacement interals to 36,000 miles.