®Multi-pocket geometry
Internal pockets and webs reveal the machining detail within a complex structure.
PC · PRECISION CUSTOM
YOUR VISION.
PRECISELY
ENGINEERED.
BILLET PISTONS · PRECISION CUSTOM
Precision custom development for billet piston projects. Bring your engine requirements, samples or design brief.
Discuss your PC project
A premium custom brand within JND
®BILLET · Geometry shaped by precision machining.
BILLET · MACHINED FROM SOLID
Complex geometry.
Precision in the details.
Actual JND billet piston photographs, exploring custom geometry and machining detail from crown to internal cavity.
Pin bosses and skirt layout
A closer view of the connections between the pin bosses, inner cavity and skirt.
Project-specific crown geometry
Crown development considers combustion-chamber and valve geometry, with the final design agreed for each project.
Contours and machining detail
A close view of internal contours, transitions and the visible toolpath texture.
These photographs show different structures from actual JND billet products. Material, specifications and engine suitability are confirmed for each project.
DESIGN TO REALITY
From CAD geometry
to a physical product.
Explore the corresponding CAD model and physical product, with a closer look at the pin bosses, internal cavity and skirt.
Crown contours and relief areas
A closer view of the crown profile and visible machining texture.
Internal geometry and pin bosses
A close view of the internal structure and pin-boss connections.
TWO-STROKE · BILLET CUSTOM
Tall profiles.
Demanding geometry.
These two-stroke billet pistons feature tall skirt profiles, illustrating a demanding custom machining project. Overall height, pin-bore layout and internal geometry guide the development of the machining approach.
See the development processA PROJECT, FROM START TO FINISH
Design. Develop.
Make it real.
This JND workflow example follows a piston-blank machining route. Billet projects use a separately agreed stock-preparation and machining plan.
CHOOSE THE RIGHT ROUTE
The right geometry.
The right manufacturing route.
The manufacturing route is a design decision, not a substitute for a complete engineering brief.
Billet
Machined from solid stock. Discuss the design, quantity and material requirements before selecting this route.
Forged
A forged blank is machined to the agreed geometry. Blank availability and design requirements are part of the review.
Project availability and process selection require technical confirmation.
THE PC APPROACH
Precision at the core.
Performance in mind.
An ambitious engine project rarely starts with a standard answer. It starts with a goal, a set of constraints and the details that make that engine different. PC was shaped around that conversation.
From a billet piston brief to a specific crown, pin or ring requirement, the focus stays on the relationship between design and manufacture. Understand the application. Define the geometry. Work through the details.
Within JND, PC is the dedicated space for precision custom development — where a customer’s requirements guide the project rather than an off-the-shelf catalogue.
A STRONGER PROJECT BRIEF
Bring the challenge.
We’ll work through the details.
Application
Engine model, intended use and the development goal.
Reference
An existing sample, non-confidential dimensions or design requirements.
Scope
Approximate quantities, sample needs and your expected timeline.
PC / DETAIL IS THE DIFFERENCE
Complex geometry. A focused development brief.
01
Pockets, webs and transitions
Actual billet-machined product details show the relationship between internal cavities, supporting webs and tool access.
Explore this detail ↗02
Tall two-stroke profiles
Tall profiles and deep internal features bring particular machining challenges. Discuss the geometry and manufacturing plan for your project.
Explore this detail ↗03
Project-specific crown development
Crown shape and valve-relief areas are developed from the engine configuration, with final dimensions and clearances confirmed in the project.
Explore this detail ↗PIN SUPPORT & LUBRICATION
Support where the loads meet.
Dual forced pin oiling
Standard-equipped models feature dual forced pin oil holes and accumulator grooves to support lubrication and stability at high engine speeds.
A matched component package
Applicable packages include 9310 nickel-alloy steel pins, a complete ring set and aluminium pin-boss support. The supplied components are specified with the piston.
Heavy-duty pin upgrades
Selected high-output applications offer or recommend HD pins, including project configurations targeting 600+ or 1,000+ hp. Suitability depends on the engine, loads and complete specification.
Features vary by model and application. Final alloy, components, clearances and installation requirements follow the confirmed product specification. Horsepower examples describe specific project configurations, not a universal piston rating.
SURFACE & FRICTION CONTROL
Engineered beyond the metal.
Molybdenum skirt coating
Molybdenum skirt coatings help reduce friction and improve running-in. Selected skirt-coating configurations also help control operating noise.
Application-specific treatments
A range of surface treatments supports service life and reliability. The finish is selected with the material, running clearance and operating conditions.
PRECISION, PRESENTED.
A considered finish. A distinct identity.
Explore two exterior design concepts for a four-piston set, bringing PC’s precision custom identity to the final presentation.
Midnight navy. Brushed steel.
A restrained navy palette gives the metallic PC identity and internal machining detail a clear focus.
Silver precision. Engineering detail.
Silver-white surfaces and a cropped product detail connect the packaging to the engineering behind it.
Packaging design concepts shown. Final format and specifications are agreed for each project.
PRECISION CUSTOM