Delivery valves are much cheaper than injectors, for those looking to stay within a given budget the larger injectors may not fit the bill. Some of our customers choose to keep the stock delivery valves and only upgrade to larger injectors in order to create the most efficient power. However, a large advantage of any delivery valve upgrade is the significant increase in throttle response that is often not attainable by injectors alone. Delivery Valve Socket. PDD Delivery Valves. PDD 7mm Delivery Valves.
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What is a Delivery Valve? Add to Wishlist. Quick View. Think of the P-pump as a mini inline-six cylinder engine bolted to the side of your inline-six cylinder engine. There are many moving parts inside. By sliding the AFC housing forward toward the front of the pump and backing out the pre-boost screw on the backside of the AFC housing , fueling can be brought in at a much lower rpm, the governor linkage is altered and the rack is adjusted forward.
And when combined with a star wheel adjustment located within the AFC housing , as much as lb-ft of torque can be added, along with a peak horsepower increase of 50 to 60 horsepower. As for the aforementioned star wheel adjustment, turning it toward the passenger side of the truck opens the fuel rack more. The star wheel is accessed via the top of the AFC housing, and adjustments should be made in very small increments.
If you go too far, heavy smoke will result. While adjusting the star wheel increases rack travel, the factory rack plug will only allow so much fuel into the plungers and barrels. If the pump stays in place, some grinding of the timing cover will be in order.
The fuel plate controls the maximum fuel output of the P, and the stock unit is conservative to say the least. While there is no shortage of aftermarket fuel plate options along with plenty of custom-made, one-off versions , removing the fuel plate completely will yield more rack travel and considerable power gains typically 35 to 40 hp. Disable the wastegate on the turbo increasing boost production by to psi and you could find another 10 to 20 hp.
As far as performance investments go, picking up to hp for free is a no-brainer! The delivery valves are positioned inside delivery valve holders, both of which are positioned between the plunger and barrel assemblies and the injection lines that feed fuel to the injectors.
Aftermarket delivery valve holders with a larger internal orifice shown above allow more fuel to travel through them. Popular kits from Dynomite Diesel Performance , PacBrake , BD Diesel and Industrial Injection provide full fueling up to 4, rpm, with even higher governor springs being available for competition-ready pumps that have been properly set up on a test stand.
The ability to fuel at high rpm is what opens the door to all kinds of horsepower potential with the valve engine. For all-out competition pumps, companies like Scheid Diesel and Columbus Diesel Supply offer governor springs that provide full fueling up to 7, rpm! Increasing the diameter of the plungers and barrels from stock 12 mm to 13 mm adds immense fueling potential.
Also similar to a miniature engine, the P utilizes a camshaft. The cam features one profile for each individual plunger and as the cam rotates the plungers are driven up and down within their respective barrels. In extreme horsepower applications, the cam inside the P is swapped out in favor of a unit with a more radical profile.
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