Skip to main content

APR Releases Upgraded Valve Spring System

APR is pleased to present the APR Valve Spring System.


The APR Valve Spring System is a high performance, lightweight upgrade designed to increase valve control and eradicate valve float common on many applications. APR’s design specifications called for a valve spring, retainer and spring seat combination that doesn’t overpower and snap the OEM valves or erode the aluminum spring seat, while still maintaining exceptional valve control. The result is an advanced design that’s 28% lighter yet 20% stiffer than the high performance OEM Golf R setup and is proven to eliminate the OEM valve train’s weakest link. We call it Performance Without Compromise!


Key Points:



  • Increase valve train control

  • 71% weight reduction over OEM Golf R retainers

  • 19% weight reduction over OEM Golf R springs

  • 20% stiffness increase over OEM Golf R springs

  • Eradicates TSI K04 “valve float” issues

  • Supports higher revving applications

  • Weight saving beehive spring design

  • ASTM A877A OTSC round wire steel springs

  • 6AL4V American titanium retainers

  • 4140 heat-treated chrome molly steel spring seats with black oxide coating

  • 29 grams per spring

  • 2 grams per retainer

  • Compatible with OEM valves

  • Spring seats included to protects against aluminum erosion in the head


valvespring_spring


Valve Springs


Weight reduction, and not necessary stiffness, is absolutely necessary to increasing valve control. The APR Valve Spring utilizes a beehive design that allows for a reduction in mass in not only the spring itself, but also through use of a smaller titanium retainer. The springs feature an ovate wire design that allows for even stress distribution resulting in better control at high RPMs through a resistance of harmful valve float inducing harmonics. The lightweight design also accomplishes accurate valve control without requiring an overly stiff spring which has been proven to snap OEM valves in half. Each valve spring weights 29 grams and represents a 19% weight reduction over the OEM Golf R spring. The result is a highly engineered design that’s simply plug and play!


valvespring_retainers


Valve Spring Retainers


Through the use of a beehive design, APR’s Engineers were able to design and supply a valve spring retainer that’s smaller than stock to reduce weight as much as possible. In an effort to offer extreme weight savings, at an additional 71% over the OEM Golf R retainers, American 6AL4V titanium was used for its high specific strength weighing in at only 2 grams each. By offering outstanding weight savings, exceptional valve control characteristic are achieved while only requiring a modest 20% increase in stiffness over the OEM Golf R spring.


valvespring_seat


Valve Spring Seats


Often an overlooked piece of an upgraded valve train is the valve spring seat. The factory heads are aluminum, and unfortunately increased spring pressure can distort or erode the mating surface overtime as they mate directly to the bare head. To prevent this from happening, APR’s Engineers designed valve spring seats out of 4140 heat-treated chrome molly steel with a black oxide coating. The spring seats are strong enough to withstand pressure from the springs and provide a mating surface that evenly distributes spring load across a larger area than the spring it self, allowing an increased spring rate without negative side effects to the aluminum head.


Eliminating Valve Float


It’s not uncommon to experience valve float with the OEM valve springs, even below the OEM rev limit. On some applications like the 2.0 TSI, backpressure from the K04 turbocharger has been known to force the exhaust valves open. This has been noticed on vehicles with overly weak OEM valve springs and some with higher miles that have simply lost their stiffness over time.


This issue accompanies misfires commonly above 5000 RPM. In some extreme cases, valves are forced open and the vehicle ceases accelerating any further. A quick datalog of intake mass airflow and boost pressure at wide open throttle will show a sudden rise in boost pressure with an immediate loss of airflow as pressure from the open valves is pushed back into the intake manifold.


On other applications, valve float can begin to occur just beyond the OEM rev limit. While other components, such as higher strength valves are often required for extremely high revving applications, the APR Valve Spring System will eliminate float well beyond the revving constraints set forth by the other components.


vwvortex discussion forums

To see what others are saying about this article or


to tell us what you think, check out the comments here...



The post APR Releases Upgraded Valve Spring System appeared first on VWVortex.






from VWVortex http://ift.tt/1zIEPV9

via IFTTT
Labels:

Comments

Post a Comment

Popular posts from this blog

Review: Saying Goodbye to the CC V6

For all its size and its global reach, Volkswagen is still, in many ways, a deeply human company. There was, for instance, the Bugatti Veyron an ego project if ever there was one. Then the purchase of Ducati, a move most called folly. And then there was the Phaeton, the Volkswagen that most folks can’t afford. Not only were these moves all strange, I’m sure that they made VW’s accountants furious. None of them made good business sense, but they were all deeply interesting and they all are evidence of the heart that beats at the center of VW. Among these follies is the CC, a car that everyone agrees is rakishly handsome, but that no one really wanted to buy. The car couldn’t last, but the world is brighter for its having been in it. With the approach debut of the Arteon, it seems like a good time to look back on its sadly departing predecessor. The version I drove, because I live in Canada, is a V6 Wolfsburg Edition, which apparently isn’t available in the States. Nor is the V6, not as...
Post a Comment
Read more

Waterfest Moves to Atco Dragway

Waterfest 24 will be held at Atco Dragway, in Atco, New Jersey. The summer event will take place at its new venue on July 21 and 22. Long held in Englishtown, New Jersey, the festival has been such a large part of the VW scene that the latest iteration of the Golf even comes with optional “Englishtown” wheels . The new venue, however, is an NHRA drag track a scant 52 miles southwest of Englishtown. The ¼ mile drag track opened in 1960, which makes it the oldest drag strip in New Jersey. The announcement came today on a social media post that announced the new location. Waterfest is North America’s largest VW/Audi show. As many 20,000 people show up for the annual show, making the second largest show in the world—with Worthersee being number one. 2018 will be Waterfest’s 24 th year in existence. The post Waterfest Moves to Atco Dragway appeared first on VWVortex . from VWVortex http://ift.tt/2GQjkuc via IFTTT
Post a Comment
Read more

Mitsubishi admits it lied about MPG ratings for all vehicles in Japan

Filed under: Government/Legal , Green , Mitsubishi , Fuel Efficiency , Japan Mitsubishi says its shady fuel-economy test practices may have been used on all vehicles it sells and has sold in Japan. Continue reading Mitsubishi admits it lied about MPG ratings for all vehicles in Japan Mitsubishi admits it lied about MPG ratings for all vehicles in Japan originally appeared on Autoblog on Wed, 11 May 2016 12:36:00 EDT. Please see our terms for use of feeds . Permalink  |  Email this  |  Comments from Autoblog Volkswagen http://ift.tt/21X3bHv
Post a Comment
Read more