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.
And an April 5 Automotive News article pointed out that the roughly $800 that GM saves on each pushrod engine it sells in NA.
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.
0L pushrod engine it replaces in power, weight, fuel economy and performance feel.
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.
But GM also offers world-class OHC multivalve mills in premium and performance products where the engine's image matters for the 20 to 30 percent who would not be satisfied with "yestertech" pushrod engines however powerful, refined and efficient.
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.
Consider, for example, 3-valve heads and cam phasers for OHV engines, the former boosting power 10-15 percent, the latter soon to be "across the board" on GM pushrod engines.