Engine Pro is expanding its lineup of Nitro Black performance parts here at PRI, with a new valve and valvespring aimed directly at the diesel performance market. First up is the replacement valvesprings for the Ford 6.0-liter and 6.4-liter PowerStroke. “The OE valvespring only has 64 pounds of pressure on the seat when new. It wears after 100,000 miles of use, and now has under 50 pounds of pressure keeping that intake valve closed,” explains Engine Pro’s Ron McKey.
“What’s happening is people are increasing the boost on this motor, and modifying it. Some of these guys are making more than 50 pounds of boost, and they are overpowering the OE spring and blowing the intake valve open when it’s not supposed to be. That’s really affecting performance.”
Engine Pro’s solution is a drop-in spring upgrade that has a seat pressure of 90 pounds, adds an additional 45 pounds of open pressure, and mimics the OEM spring’s coil-bind specs. “This spring uses the same retainers and you don’t need to modify the head at all,” McKey says. “It allows a higher operating RPM, up to 90 psi of boost – which not too many people are going to come close to – and it just cures a huge problem at a reasonable price, and it’s easy to install.”
Complementing the valvesprings are new, upgraded diesel valves, which use some fairly exotic materials, which are becoming more common. “Our exhaust valve is made from Inconel and then is faced with Stellite.” McKey explains. “Then we perform our proprietary liquid-nitriding process to it.”
That liquid-nitriding process gives the parts the signature Nitro Black finish. “It isn’t a coating, but an actual treatment that penetrates the metal and makes it smoother, stronger and less prone to cracking,” McKey says. “It makes the valve less brittle as well, so that it will bend instead of breaking. It also doesn’t allow deposits to build up on the backside of the valve, so it works well with exotic fuels.”
For more on Engine Pro’s lineup of Nitro Black engine components, check out their website.