Double-Barrel Rail, New Products, and Development | Justin Norris S&S Diesel

“Third gear” is a specific gear ratio in a manual or automatic transmission. In diesel performance tuning, referencing a particular gear (like third) usually means the tune is being tested or optimized for how the truck behaves under load at that gear during a pull.

Diesel injectors are the fuel-delivery components that spray pressurized fuel into the engine’s combustion chambers. In tuning, injector control is critical because it directly affects fueling quantity and timing, which then changes power, smoke, and drivability.

Injector output is how much fuel an injector delivers per injection event (often discussed as quantity and effective fueling rate). When diesel tuners increase injector output, the engine can inject more fuel, but it also stresses the fuel system’s ability to maintain pressure and flow.

A double barrel fuel rail is an upgraded diesel common-rail component designed to increase effective fuel volume and help stabilize rail pressure. By providing more “buffer” volume, it reduces how much pressure drops each time injectors fire, which supports higher fueling and more consistent injection timing/quantity.

“Injector open” refers to the period when the injector is actively spraying fuel. During that time, if rail pressure is dropping, the injector can deliver less fuel than intended, so stabilizing rail pressure helps maintain commanded fueling.

Microseconds are extremely small time intervals (one-millionth of a second). Diesel injection events are controlled on these tiny timescales, so even small pressure losses during the injector-open time can affect how much fuel actually gets delivered.

Rail pressure control is the strategy for keeping the diesel fuel pressure in the high-pressure fuel rail at a target level. On modern common-rail diesels, stable rail pressure helps the ECU deliver consistent injector flow and timing, which improves power and drivability.

Turbochargers are forced-induction devices that use exhaust gas energy to spin a compressor, pushing more air into the engine. In diesel tuning, they’re often pushed hard because more airflow supports more fuel and higher power—up to the limits of compressor maps and exhaust backpressure.

Dinotesting means running the vehicle on a dynamometer to measure results like power and torque under controlled conditions. The host notes they can’t claim horsepower gains yet because they don’t have dyno data.

UCC is referenced as the event or venue where Tim Moore previously made over 3,800 horsepower. In this context, it’s a shorthand for a specific competition or testing location used by the diesel performance community.

240 MPa is a very high common-rail diesel fuel pressure used for testing. MPa (megapascals) is a pressure unit; at this level, injectors and the fuel system are operating near the upper end of what competition tuning targets.

A double barrel rail is a modified high-pressure diesel fuel rail design intended to increase fuel volume available to the injectors. The host says the main benefit is extra volume, which can support higher fuel quantity delivery for competition-focused setups.

An engine dyno is a test stand that measures an engine’s output (like horsepower and torque) while controlling operating conditions. “Back-to-back” dyno testing means running two setups under the same conditions to compare results fairly.

Durability testing evaluates whether a component can withstand repeated use over time, not just whether it works once. In performance diesel development, durability testing often includes running parts on test benches to confirm they hold pressure and flow without failing.

“Bar” is a pressure unit; 3000 bar is extremely high fuel pressure for diesel systems. Testing components to a specific bar number is a way to prove they can survive extreme operating conditions, even if the manufacturer doesn’t recommend running that pressure in everyday use.

Cummins is a heavy-duty engine and diesel technology company, especially known for diesel powertrains used in trucks. Referencing “Cummins engineers” implies the development team understands how diesel engines and fuel systems behave under real-world load.

Bosch is a major automotive supplier known for diesel fuel system components and engineering expertise. Mentioning “former Bosch engineers” signals that the product development draws on established fuel-system know-how.

These are small drain passages on the injector port area of a diesel fuel rail. They let any tiny leak (a “weep”) escape instead of building pressure under the fitting until the line can blow off or fail.

Dual feeding means supplying fuel to two components (or two fuel rails/paths) from a single system so the engine can support higher flow. The host says it’s difficult to do well with a factory rail, which is why they pursued an aftermarket solution.

CP3 is shorthand for the Bosch CP3 high-pressure fuel pump used on many diesel applications. The host is describing how feeding one CP3 into another can work only up to a certain power level before fuel demands exceed what the setup can support.

In this context, an accumulator is a volume of fuel (or a device that adds volume) used to smooth out pressure changes in the rail. It reduces pressure fluctuations caused by injector events, improving consistency and measurement accuracy.

Pulsations are rapid, repeating pressure (or flow) variations caused by the injector’s on/off events. Large accumulators and rail volume dampen these oscillations for steadier pressure and more repeatable results.

Auxiliary ports are extra threaded openings on the fuel rail used for adding sensors or control components. In this case, they let the builder place a pressure sensor or pressure relief valve where it’s most useful.

A super stock engine refers to a competition class or build level where the engine is pushed beyond typical street setups while still following certain rules. The speaker implies that only very high-demand builds would need multiple fuel pumps.

A pressure relief valve is a safety/control valve that opens to prevent fuel pressure from exceeding a safe limit. The speaker’s point is that the modular rail lets you mount it in different locations depending on the setup.

A pressure sensor measures the fuel pressure at a specific point on the rail. Using the rail’s auxiliary ports lets the tuner log pressure accurately during testing or tuning.

EGTs are exhaust gas temperatures. They’re a key indicator of how hard the engine is working thermally, and excessive EGTs can accelerate wear or damage components—so serious tuning often monitors them.

Transmission safety refers to keeping the drivetrain within safe stress limits (torque, heat, and shift/load behavior) when increasing engine output. Diesel tunes can raise torque significantly, so validating transmission behavior is critical to avoid failures.

DPF stands for diesel particulate filter. It traps soot from a diesel engine and periodically regenerates (burns off the soot) to keep emissions under control, so aggressive tuning can affect how well it survives and regenerates.

EGR stands for exhaust gas recirculation. It routes some exhaust back into the intake to reduce combustion temperatures and NOx emissions, and higher power calibrations can stress EGR hardware if fueling/airflow aren’t managed carefully.

In diesel tuning, “calibrations” are the engine control unit (ECU) settings that determine how much fuel is injected, when it’s injected, and how the emissions systems are managed. Different calibrations can change power output and also how safely the engine and aftertreatment components behave.

A chassis dyno measures performance with the whole vehicle (or at least the drivetrain) on rollers. It helps tuners evaluate real-world load and drivability, and it can reveal issues that an engine dyno alone might not show.

“CP4 metal” refers to metal contamination originating from the CP4 high-pressure fuel pump. When that pump wears internally, fine metal particles can travel through the fuel system, damaging injectors and other components—so kits are designed to stop or mitigate that failure chain.

A fuel filter housing is the enclosure that holds the diesel fuel filter and its seals, directing fuel through the filter before it reaches the rest of the system. In this episode, the housing is described as a plastic component that can crack and leak on certain Ford diesels, motivating the “fuel leak prevention” kit.

The “6-7 Power Stroke” is a reference to Ford’s 6.7-liter Power Stroke diesel engine family. The episode connects this engine to a common issue: fuel filter housing cracking and leaking, which can lead to serious consequences if not addressed.

Billet aluminum is aluminum machined from a solid block, producing a dense, rigid part with consistent material properties. Here it’s used as the material choice for the upgraded fuel filter housing to resist cracking and leaking compared with plastic.

Factory filtration is the original, manufacturer-designed level of filtration in the fuel system—filter type, flow path, and how well it removes contaminants. The host emphasizes they don’t want aftermarket changes that reduce filtration effectiveness while solving the leak problem.

“Micron absolute” is a filtration rating that describes the particle size the filter can capture. A 4-micron absolute filter is intended to stop very small contaminants more consistently than a higher micron rating.

Filter efficiency is how effectively the filter removes contaminants at a given particle size. “99% efficiency” means the filter is designed to capture nearly all particles in the target size range, rather than just reducing them a little.

A “5 micron” filter rating means it’s designed to capture particles down to about 5 microns in size. In this discussion, it’s used as a baseline comparison to show how the aftermarket filter’s rating differs from the Ford factory filter.

A fuel leak prevention kit is an aftermarket set of fittings and hoses designed to address common leak points in a diesel fuel system. In this segment, the host focuses on preventing leaks caused by plastic fittings cracking over time.

This refers to the kit’s replacement fitting made from aluminum to resist cracking. The host contrasts it with the factory-style plastic fittings that can crack from heat cycles and eventually leak.

Injector return fittings are the connections that route “return” fuel from the injectors back through the fuel system. If these fittings crack—especially if they’re plastic—they can cause leaks that are common enough to motivate aftermarket fixes.

A quick connect is a fuel-line style fitting that allows faster installation without complex tools. Here, it’s used on one end of the aluminum replacement fitting to make swapping out cracked plastic parts easier.

A hose barb is a ridged fitting that grips a flexible hose to create a seal. In this kit, the hose barb end mates with the hose side, while the other end uses a quick-connect style interface.

The Ford F-250 through F-750 are heavy-duty pickup and truck models that commonly use diesel fuel systems where filtration and leak-prone fittings matter. This segment is specifically about a kit that’s designed to fit those Ford trucks across a wide model-year range.

A dipstick mount is a bracket or relocation piece that holds the engine oil dipstick in a fixed position. In this case, the mount is used when an aftermarket intake setup interferes with the dipstick’s normal location, preventing it from flopping and contacting other components.

A filter head is the housing/assembly where a fuel filter mounts and seals to the fuel system. Here, the dipstick relocation problem is described as the dipstick being shifted into the area near the filter head, which can cause interference.

A direct drop-in is a parts fitment promise meaning the component installs with minimal modification and uses the factory mounting points. The speaker contrasts this with an unexpected compatibility issue caused by dipstick placement relative to the filter head.

Aftermarket intakes are non-factory air intake systems installed to change airflow and sometimes improve throttle response or efficiency. In this segment, aftermarket intakes are specifically called out as changing the packaging around the dipstick, requiring a dipstick mount to avoid contact with the filter head.

A fuel system is the set of components that stores, filters, pumps, and delivers fuel to the engine. In diesel performance contexts, it’s especially important because small amounts of contamination can affect high-pressure injection hardware.

A “stage two filter” implies a second filtration step in the diesel fuel path, used to catch fine dirt after the primary filter. The host is emphasizing that if you install components upstream of this stage, you may be removing the last barrier against debris.

A “disaster prevention kit” is an aftermarket kit intended to reduce the chance of a failure during a common maintenance or upgrade procedure—typically by protecting the fuel system from contamination. The host compares installing this product to installing that kit, implying a similar level of work but with fewer steps.

The “plastic cup” is the stock filter’s mounting/containment piece that surrounds the factory filter element. The host explains they removed it entirely because it prevented them from retaining the filtration specifications they designed for the aftermarket setup.

Fueling quantity is the amount of diesel fuel delivered during injection events. More fueling quantity (within safe limits) can increase torque and power, but it must be balanced with air supply and emissions controls.

The BMW X5 is a midsize luxury SUV that’s been offered with diesel powertrains in some markets. In this segment, it’s mentioned as an application that can receive a diesel “disaster prevention” kit aimed at protecting the high-pressure fuel system.

The BMW 5 Series (spoken here as “535s”) is BMW’s midsize executive sedan line that has also been sold with diesel engines in some markets. The context is that disaster-prevention fuel kits can be applied to certain diesel configurations to reduce the risk of high-pressure fuel system failures.

EcoDiesel is a diesel engine branding used by FCA/Stellantis for certain Ram and Jeep models. In this segment, it’s mentioned as an application where disaster-prevention kits are available to protect the high-pressure fuel system.

A flat tappet is a camshaft follower design where the lifter face is flat, commonly used in older engine architectures. In diesel performance discussions, it’s referenced as part of a protective or upgraded setup that helps manage wear and durability.