overhead valve

(redirected from Pushrod engine)

overhead valve

A valve located in the upper part of the aircraft reciprocating engine cylinder head. Both the inlet and outlet valves are overhead valves. See induction stroke.
References in periodicals archive ?
Jupiter sports cars were built from 1950 to 1954 and the Jowett-designed 1,486cc flat-four pushrod engine of 60-62bhp gave them considerable punch.
The final model, the 356C, featured disc brakes and two engine options, the most powerful pushrod engine Porsche ever produced: the 95 hp SC as well as the standard C at 75 hp.
The Jaguar engine weighs approximately 100 pounds less than the Ford pushrod V8 that it replaces, and it will rev up to 9,000 rpm -- up from 8,200 in the pushrod engine.
By placing a cam phasing system on the camshaft, a pushrod engine can be tuned to take much higher levels of exhaust gas recirculation.
The line goes back to the Renault 5 Turbo with a blowser clamped on to its 1400cc pushrod engine that packed a fair wallop, albeit it had something of a glass jaw in some fragile mechanics.
The 3800 Series II V6, the only pushrod engine selected in the 1995 competition, achieves 205 horsepower and 230 lbs.
Roger Penske, who has fielded entries for 26 consecutive years at the Indianapolis 500 with a record nine victories, said, "In looking at the USAC rules for the 1994 Indianapolis 500 with Mercedes-Benz, we thought the pushrod/two-valve design would be a competitive power plant, considering the past success of the Buick pushrod engine.
The way the old Viper engine was designed it had a lot of internal EGR [exhaust gas recirculation] from valve overlap and we discovered the only way to make the big horsepower number and have a smooth idle in the same package was to apply a device that would limit the overlap and allow the engine to run overall very smoothly," said Gladysz, who predicts the Mechadyne concentric camshaft technology will be adopted by other OEMs interested in maintaining the longevity of pushrod engines.
While pushrod engines such as the LS1 engine continue to earn awards for their excellent performance, GM Powertrain also is intensifying its focus on overhead cam engines.
And while he admits the competition has Ford beat in terms of cots with their pushrod engines, "I believe we have a greater opportunity to manage the engine and transmission as a system, while being not that far behind in terms of cost.